diff --git a/.gitignore b/.gitignore
index 835134937..eda0126c5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,6 +29,7 @@ src/osmo-bts-sysmo/sysmobts
 src/osmo-bts-sysmo/sysmobts-remote
 src/osmo-bts-sysmo/sysmobts-mgr
 
+src/osmo-bts-trx/osmobts-trx
 
 tests/atconfig
 tests/package.m4
diff --git a/configure.ac b/configure.ac
index 641a6c9a2..752e85b30 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,6 +37,14 @@ AC_ARG_ENABLE(sysmocom-bts,
 AC_MSG_RESULT([$enable_sysmocom_bts])
 AM_CONDITIONAL(ENABLE_SYSMOBTS, test "x$enable_sysmocom_bts" = "xyes")
 
+AC_MSG_CHECKING([whether to enable trx hardware support])
+AC_ARG_ENABLE(trx,
+		AC_HELP_STRING([--enable-trx],
+				[enable code for trx hardware [default=no]]),
+		[enable_trx="yes"],[enable_trx="no"])
+AC_MSG_RESULT([$enable_trx])
+AM_CONDITIONAL(ENABLE_TRX, test "x$enable_trx" = "xyes")
+
 # We share gsm_data.h with OpenBSC and need to be pointed to the source
 # directory of OpenBSC for now.
 AC_ARG_WITH([openbsc],
@@ -70,6 +78,7 @@ AC_OUTPUT(
     src/Makefile
     src/common/Makefile
     src/osmo-bts-sysmo/Makefile
+    src/osmo-bts-trx/Makefile
     include/Makefile
     include/osmo-bts/Makefile
     tests/Makefile
diff --git a/include/osmo-bts/gsm_data.h b/include/osmo-bts/gsm_data.h
index bfa5285bf..06115b334 100644
--- a/include/osmo-bts/gsm_data.h
+++ b/include/osmo-bts/gsm_data.h
@@ -115,6 +115,13 @@ static inline struct femtol1_hdl *trx_femtol1_hdl(struct gsm_bts_trx *trx)
 	return trx->role_bts.l1h;
 }
 
+struct trx_l1h;
+
+static inline struct trx_l1h *trx_l1h_hdl(struct gsm_bts_trx *trx)
+{
+	return trx->role_bts.l1h;
+}
+
 
 void lchan_set_state(struct gsm_lchan *lchan, enum gsm_lchan_state state);
 
diff --git a/include/osmo-bts/logging.h b/include/osmo-bts/logging.h
index 226f77b75..b7c8a270a 100644
--- a/include/osmo-bts/logging.h
+++ b/include/osmo-bts/logging.h
@@ -16,6 +16,7 @@ enum {
 	DDSP,
 	DPCU,
 	DHO,
+	DTRX,
 	DABIS,
 	DRTP,
 	DSUM,
diff --git a/include/osmo-bts/rsl.h b/include/osmo-bts/rsl.h
index 42ea6ef71..6cb40dd29 100644
--- a/include/osmo-bts/rsl.h
+++ b/include/osmo-bts/rsl.h
@@ -11,6 +11,8 @@ enum {
 	LCHAN_REL_ACT_OML,
 };
 
+int msgb_queue_flush(struct llist_head *list);
+
 int down_rsl(struct gsm_bts_trx *trx, struct msgb *msg);
 int rsl_tx_rf_res(struct gsm_bts_trx *trx);
 int rsl_tx_chan_rqd(struct gsm_bts_trx *trx, struct gsm_time *gtime,
diff --git a/src/Makefile.am b/src/Makefile.am
index e2eab0daf..b8fe655c2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -3,3 +3,6 @@ SUBDIRS = common
 if ENABLE_SYSMOBTS
 SUBDIRS += osmo-bts-sysmo
 endif
+if ENABLE_TRX
+SUBDIRS += osmo-bts-trx
+endif
diff --git a/src/common/logging.c b/src/common/logging.c
index 1e071dbb9..b117ee041 100644
--- a/src/common/logging.c
+++ b/src/common/logging.c
@@ -107,6 +107,12 @@ static struct log_info_cat bts_log_info_cat[] = {
 		.color = "\033[0;37m",
 		.enabled = 1, .loglevel = LOGL_NOTICE,
 	},
+	[DTRX] = {
+		.name = "DTRX",
+		.description = "TRX interface",
+		.color = "\033[1;33m",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
 #if 0
 	[DNS] = {
 		.name = "DNS",
diff --git a/src/osmo-bts-trx/Makefile.am b/src/osmo-bts-trx/Makefile.am
new file mode 100644
index 000000000..94a050cea
--- /dev/null
+++ b/src/osmo-bts-trx/Makefile.am
@@ -0,0 +1,11 @@
+INCLUDES = $(all_includes) -I$(top_srcdir)/include -I$(OPENBSC_INCDIR)
+AM_CFLAGS = -Wall -fno-strict-aliasing $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOTRAU_CFLAGS) $(LIBOSMOABIS_CFLAGS)
+LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) $(LIBOSMOTRAU_LIBS) $(LIBOSMOABIS_LIBS) -lortp
+
+EXTRA_DIST = trx_if.h l1_if.h scheduler.h xcch.h rach.h sch.h pxxch.h tch_fr.h
+
+bin_PROGRAMS = osmobts-trx
+
+osmobts_trx_SOURCES = main.c trx_if.c l1_if.c scheduler.c trx_vty.c xcch.c rach.c sch.c pxxch.c tch_fr.c
+osmobts_trx_LDADD = $(top_builddir)/src/common/libbts.a $(LDADD)
+
diff --git a/src/osmo-bts-trx/l1_if.c b/src/osmo-bts-trx/l1_if.c
new file mode 100644
index 000000000..66922b54c
--- /dev/null
+++ b/src/osmo-bts-trx/l1_if.c
@@ -0,0 +1,571 @@
+/*
+ * layer 1 primitive handling and interface
+ *
+ * Copyright (C) 2013  Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/bits.h>
+
+#include <osmo-bts/logging.h>
+#include <osmo-bts/bts.h>
+#include <osmo-bts/oml.h>
+#include <osmo-bts/rsl.h>
+#include <osmo-bts/l1sap.h>
+#include <osmo-bts/bts_model.h>
+
+#include "l1_if.h"
+#include "trx_if.h"
+#include "scheduler.h"
+
+
+static const uint8_t tranceiver_chan_types[_GSM_PCHAN_MAX] = {
+	[GSM_PCHAN_NONE]                = 8,
+	[GSM_PCHAN_CCCH]                = 6,
+	[GSM_PCHAN_CCCH_SDCCH4]         = 5,
+	[GSM_PCHAN_TCH_F]               = 1,
+	[GSM_PCHAN_TCH_H]               = 2,
+	[GSM_PCHAN_SDCCH8_SACCH8C]      = 7,
+	[GSM_PCHAN_PDCH]                = 13,
+	//[GSM_PCHAN_TCH_F_PDCH]                = FIXME,
+	[GSM_PCHAN_UNKNOWN]             = 0,
+};
+
+
+/*
+ * create destroy trx l1 instance
+ */
+
+struct trx_l1h *l1if_open(struct gsm_bts_trx *trx)
+{
+	struct trx_l1h *l1h;
+	int rc;
+
+	l1h = talloc_zero(tall_bts_ctx, struct trx_l1h);
+	if (!l1h)
+		return NULL;
+	l1h->trx = trx;
+	trx->role_bts.l1h = l1h;
+
+	trx_sched_init(l1h);
+
+	rc = trx_if_open(l1h);
+	if (rc < 0) {
+		LOGP(DL1C, LOGL_FATAL, "Cannot initialize scheduler\n");
+		goto err;
+	}
+
+	return l1h;
+
+err:
+	l1if_close(l1h);
+	return NULL;
+}
+
+void l1if_close(struct trx_l1h *l1h)
+{
+	trx_if_close(l1h);
+	trx_sched_exit(l1h);
+	talloc_free(l1h);
+}
+
+void l1if_reset(struct trx_l1h *l1h)
+{
+}
+
+void check_tranceiver_availability(struct trx_l1h *l1h)
+{
+	struct gsm_bts_trx *trx = l1h->trx;
+	uint8_t tn;
+
+	/* HACK, we should change state when we receive first clock from
+	 * tranceiver */
+	if (1) {
+		/* signal availability */
+		oml_mo_state_chg(&trx->mo, NM_OPSTATE_DISABLED, NM_AVSTATE_OK);
+		oml_mo_tx_sw_act_rep(&trx->mo);
+		oml_mo_state_chg(&trx->bb_transc.mo, -1, NM_AVSTATE_OK);
+		oml_mo_tx_sw_act_rep(&trx->bb_transc.mo);
+
+		for (tn = 0; tn < 8; tn++)
+			oml_mo_state_chg(&trx->ts[tn].mo, NM_OPSTATE_DISABLED,
+				(l1h->config.slotmask & (1 << tn)) ?
+					NM_AVSTATE_DEPENDENCY :
+					NM_AVSTATE_NOT_INSTALLED);
+	} else {
+		oml_mo_state_chg(&trx->mo, NM_OPSTATE_DISABLED,
+			NM_AVSTATE_OFF_LINE);
+		oml_mo_state_chg(&trx->bb_transc.mo, NM_OPSTATE_DISABLED,
+			NM_AVSTATE_OFF_LINE);
+	}
+}
+
+
+/*
+ * tranceiver provisioning
+ */
+int l1if_provision_tranceiver_trx(struct trx_l1h *l1h)
+{
+	uint8_t tn;
+
+	if (l1h->config.poweron
+	 && l1h->config.tsc_valid
+	 && l1h->config.bsic_valid
+	 && l1h->config.arfcn_valid) {
+	 	/* before power on */
+		if (l1h->config.arfcn_valid && !l1h->config.arfcn_sent) {
+			trx_if_cmd_rxtune(l1h, l1h->config.arfcn);
+			trx_if_cmd_txtune(l1h, l1h->config.arfcn);
+			l1h->config.arfcn_sent = 1;
+		}
+		if (l1h->config.tsc_valid && !l1h->config.tsc_sent) {
+			trx_if_cmd_settsc(l1h, l1h->config.tsc);
+			l1h->config.tsc_sent = 1;
+		}
+		if (l1h->config.bsic_valid && !l1h->config.bsic_sent) {
+			trx_if_cmd_setbsic(l1h, l1h->config.bsic);
+			l1h->config.bsic_sent = 1;
+		}
+
+		if (!l1h->config.poweron_sent) {
+			trx_if_cmd_poweron(l1h);
+			l1h->config.poweron_sent = 1;
+		}
+
+		/* after power on */
+		if (l1h->config.rxgain_valid && !l1h->config.rxgain_sent) {
+			trx_if_cmd_setrxgain(l1h, l1h->config.rxgain);
+			l1h->config.rxgain_sent = 1;
+		}
+		if (l1h->config.power_valid && !l1h->config.power_sent) {
+			trx_if_cmd_setpower(l1h, l1h->config.power);
+			l1h->config.power_sent = 1;
+		}
+		if (l1h->config.maxdly_valid && !l1h->config.maxdly_sent) {
+			trx_if_cmd_setmaxdly(l1h, l1h->config.maxdly);
+			l1h->config.maxdly_sent = 1;
+		}
+		for (tn = 0; tn < 8; tn++) {
+			if (l1h->config.slottype_valid[tn]
+			 && !l1h->config.slottype_sent[tn]) {
+				trx_if_cmd_setslot(l1h, tn,
+					l1h->config.slottype[tn]);
+				l1h->config.slottype_sent[tn] = 1;
+			}
+		}
+		return 0;
+	}
+
+	if (!l1h->config.poweron && !l1h->config.poweron_sent) {
+		trx_if_cmd_poweroff(l1h);
+		l1h->config.poweron_sent = 1;
+		l1h->config.rxgain_sent = 0;
+		l1h->config.power_sent = 0;
+		l1h->config.maxdly_sent = 0;
+		for (tn = 0; tn < 8; tn++)
+			l1h->config.slottype_sent[tn] = 0;
+	}
+
+	return 0;
+}
+
+int l1if_provision_tranceiver(struct gsm_bts *bts)
+{
+	struct gsm_bts_trx *trx;
+	struct trx_l1h *l1h;
+
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		l1h = trx_l1h_hdl(trx);
+		l1h->config.arfcn_sent = 0;
+		l1h->config.tsc_sent = 0;
+		l1h->config.bsic_sent = 0;
+		l1h->config.poweron_sent = 0;
+		l1h->config.rxgain_sent = 0;
+		l1h->config.power_sent = 0;
+		l1h->config.maxdly_sent = 0;
+		l1if_provision_tranceiver_trx(l1h);
+	}
+	return 0;
+}
+
+/*
+ * activation/configuration/deactivation of tranceiver's TRX
+ */
+
+/* initialize the layer1 */
+static int trx_init(struct gsm_bts_trx *trx)
+{
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	/* power on tranceiver, if not already */
+	if (!l1h->config.poweron) {
+		l1h->config.poweron = 1;
+		l1h->config.poweron_sent = 0;
+		l1if_provision_tranceiver_trx(l1h);
+	}
+
+	if (trx == trx->bts->c0)
+		lchan_init_lapdm(&trx->ts[0].lchan[4]);
+
+	/* Set to Operational State: Enabled */
+	oml_mo_state_chg(&trx->mo, NM_OPSTATE_ENABLED, NM_AVSTATE_OK);
+
+	/* Send OPSTART ack */
+	return oml_mo_opstart_ack(&trx->mo);
+}
+
+/* deactivate tranceiver */
+static int trx_close(struct gsm_bts_trx *trx)
+{
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	if (l1h->config.poweron) {
+		l1h->config.poweron = 0;
+		l1h->config.poweron_sent = 0;
+		l1if_provision_tranceiver_trx(l1h);
+	}
+
+	return 0;
+}
+
+/* set bts attributes */
+static uint8_t trx_set_bts(struct gsm_bts *bts)
+{
+	struct gsm_bts_trx *trx;
+	struct trx_l1h *l1h;
+	uint8_t bsic = bts->bsic;
+
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		l1h = trx_l1h_hdl(trx);
+		if (l1h->config.bsic != bsic || !l1h->config.bsic_valid) {
+			l1h->config.bsic = bsic;
+			l1h->config.bsic_valid = 1;
+			l1h->config.bsic_sent = 0;
+		}
+		check_tranceiver_availability(l1h);
+	}
+
+
+	return 0;
+}
+
+/* set trx attributes */
+static uint8_t trx_set_trx(struct gsm_bts_trx *trx)
+{
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+	uint16_t arfcn = trx->arfcn;
+
+	if (l1h->config.arfcn != arfcn || !l1h->config.arfcn_valid) {
+		l1h->config.arfcn = arfcn;
+		l1h->config.arfcn_valid = 1;
+		l1h->config.arfcn_sent = 0;
+	}
+
+	return 0;
+}
+
+/* set ts attributes */
+static uint8_t trx_set_ts(struct gsm_bts_trx_ts *ts)
+{
+	struct trx_l1h *l1h = trx_l1h_hdl(ts->trx);
+	uint8_t tn = ts->nr;
+	uint16_t tsc = ts->tsc;
+	enum gsm_phys_chan_config pchan = ts->pchan;
+	uint8_t slottype;
+	int rc;
+
+	/* all TSC of all timeslots must be equal, because tranceiver only
+	 * supports one TSC per TRX */
+
+	if (l1h->config.tsc != tsc || !l1h->config.tsc_valid) {
+		l1h->config.tsc = tsc;
+		l1h->config.tsc_valid = 1;
+		l1h->config.tsc_sent = 0;
+	}
+
+	/* set physical channel */
+	rc = trx_sched_set_pchan(l1h, tn, pchan);
+	if (rc)
+		return NM_NACK_RES_NOTAVAIL;
+
+	slottype = tranceiver_chan_types[pchan];
+	
+	if (l1h->config.slottype[tn] != slottype
+	 || !l1h->config.slottype_valid[tn]) {
+		l1h->config.slottype[tn] = slottype;
+		l1h->config.slottype_valid[tn] = 1;
+		l1h->config.slottype_sent[tn] = 0;
+		l1if_provision_tranceiver_trx(l1h);
+	}
+
+	return 0;
+}
+
+
+/*
+ * primitive handling
+ */
+
+/* enable ciphering */
+static int l1if_set_ciphering(struct trx_l1h *l1h, struct gsm_lchan *lchan,
+	int downlink)
+{
+	// FIXME
+	return 0;
+}
+
+/* channel mode, encryption and/or multirate have changed */
+static int l1if_rsl_mode_modify(struct trx_l1h *l1h, struct gsm_lchan *lchan,
+	int downlink)
+{
+
+	// FIXME
+	return 0;
+}
+
+static int mph_info_chan_confirm(struct trx_l1h *l1h, uint8_t chan_nr,
+	enum osmo_mph_info_type type, uint8_t cause)
+{
+	struct osmo_phsap_prim l1sap;
+
+	memset(&l1sap, 0, sizeof(l1sap));
+	osmo_prim_init(&l1sap.oph, SAP_GSM_PH, PRIM_MPH_INFO, PRIM_OP_CONFIRM,
+		NULL);
+	l1sap.u.info.type = type;
+	l1sap.u.info.u.act_cnf.chan_nr = chan_nr;
+	l1sap.u.info.u.act_cnf.cause = cause;
+
+	return l1sap_up(l1h->trx, &l1sap);
+}
+
+int l1if_mph_time_ind(struct gsm_bts *bts, uint32_t fn)
+{
+	struct osmo_phsap_prim l1sap;
+
+	memset(&l1sap, 0, sizeof(l1sap));
+	osmo_prim_init(&l1sap.oph, SAP_GSM_PH, PRIM_MPH_INFO,
+		PRIM_OP_INDICATION, NULL);
+	l1sap.u.info.type = PRIM_INFO_TIME;
+	l1sap.u.info.u.time_ind.fn = fn;
+
+	if (!bts->c0)
+		return -EINVAL;
+
+	return l1sap_up(bts->c0, &l1sap);
+}
+
+
+/* primitive from common part */
+int bts_model_l1sap_down(struct gsm_bts_trx *trx, struct osmo_phsap_prim *l1sap)
+{
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+	struct msgb *msg = l1sap->oph.msg;
+	uint8_t chan_nr;
+	uint8_t tn, ss;
+	int rc = 0;
+	struct gsm_lchan *lchan;
+
+	switch (OSMO_PRIM_HDR(&l1sap->oph)) {
+	case OSMO_PRIM(PRIM_PH_DATA, PRIM_OP_REQUEST):
+		if (!msg)
+			break;
+		/* put data into scheduler's queue */
+		return trx_sched_ph_data_req(l1h, l1sap);
+	case OSMO_PRIM(PRIM_TCH, PRIM_OP_REQUEST):
+		if (!msg)
+			break;
+		/* put data into scheduler's queue */
+		return trx_sched_tch_req(l1h, l1sap);
+	case OSMO_PRIM(PRIM_MPH_INFO, PRIM_OP_REQUEST):
+		switch (l1sap->u.info.type) {
+		case PRIM_INFO_ACT_CIPH:
+			chan_nr = l1sap->u.info.u.ciph_req.chan_nr;
+			tn = L1SAP_CHAN2TS(chan_nr);
+			ss = l1sap_chan2ss(chan_nr);
+			lchan = &trx->ts[tn].lchan[ss];
+			if (l1sap->u.info.u.ciph_req.downlink) {
+ 				l1if_set_ciphering(l1h, lchan, 1);
+				lchan->ciph_state = LCHAN_CIPH_RX_REQ;
+			}
+			if (l1sap->u.info.u.ciph_req.uplink) {
+				l1if_set_ciphering(l1h, lchan, 0);
+				lchan->ciph_state = LCHAN_CIPH_TXRX_REQ;
+			}
+			break;
+		case PRIM_INFO_ACTIVATE:
+		case PRIM_INFO_DEACTIVATE:
+		case PRIM_INFO_MODIFY:
+			chan_nr = l1sap->u.info.u.act_req.chan_nr;
+			tn = L1SAP_CHAN2TS(chan_nr);
+			ss = l1sap_chan2ss(chan_nr);
+			lchan = &trx->ts[tn].lchan[ss];
+			if (l1sap->u.info.type == PRIM_INFO_ACTIVATE) {
+				if ((chan_nr & 0x80)) {
+					LOGP(DL1C, LOGL_ERROR, "Cannot activate"
+						" chan_nr 0x%02x\n", chan_nr);
+					break;
+				}
+				/* activate dedicated channel */
+				trx_sched_set_lchan(l1h, chan_nr, 0x00, 0, 1);
+				trx_sched_set_lchan(l1h, chan_nr, 0x00, 1, 1);
+				trx_sched_set_lchan(l1h, chan_nr, 0x40, 0, 1);
+				trx_sched_set_lchan(l1h, chan_nr, 0x40, 1, 1);
+				/* init lapdm */
+				lchan_init_lapdm(lchan);
+				/* confirm */
+				mph_info_chan_confirm(l1h, chan_nr,
+					PRIM_INFO_ACTIVATE, 0);
+				break;
+			}
+			if (l1sap->u.info.type == PRIM_INFO_MODIFY) {
+				l1if_rsl_mode_modify(l1h, lchan, 0);
+				l1if_rsl_mode_modify(l1h, lchan, 1);
+				break;
+			}
+			if ((chan_nr & 0x80)) {
+				LOGP(DL1C, LOGL_ERROR, "Cannot deactivate "
+					"chan_nr 0x%02x\n", chan_nr);
+				break;
+			}
+			/* deactivate dedicated channel */
+			if (!l1sap->u.info.u.act_req.sacch_only) {
+				trx_sched_set_lchan(l1h, chan_nr, 0x00, 0, 0);
+				trx_sched_set_lchan(l1h, chan_nr, 0x00, 1, 0);
+			}
+			trx_sched_set_lchan(l1h, chan_nr, 0x40, 0, 0);
+			trx_sched_set_lchan(l1h, chan_nr, 0x40, 1, 0);
+			/* confirm */
+			mph_info_chan_confirm(l1h, chan_nr,
+				PRIM_INFO_DEACTIVATE, 0);
+			break;
+		default:
+			LOGP(DL1C, LOGL_NOTICE, "unknown MPH-INFO.req %d\n",
+				l1sap->u.info.type);
+			rc = -EINVAL;
+			goto done;
+		}
+		break;
+	default:
+		LOGP(DL1C, LOGL_NOTICE, "unknown prim %d op %d\n",
+			l1sap->oph.primitive, l1sap->oph.operation);
+		rc = -EINVAL;
+		goto done;
+	}
+
+done:
+	if (msg)
+		msgb_free(msg);
+	return rc;
+}
+
+
+/*
+ * oml handling
+ */
+
+/* callback from OML */
+int bts_model_check_oml(struct gsm_bts *bts, uint8_t msg_type,
+			struct tlv_parsed *old_attr, struct tlv_parsed *new_attr,
+			void *obj)
+{
+	/* FIXME: check if the attributes are valid */
+	return 0;
+}
+
+/* callback from OML */
+int bts_model_apply_oml(struct gsm_bts *bts, struct msgb *msg,
+			struct tlv_parsed *new_attr, int kind, void *obj)
+{
+	struct abis_om_fom_hdr *foh = msgb_l3(msg);
+	int cause = 0;
+
+	switch (foh->msg_type) {
+	case NM_MT_SET_BTS_ATTR:
+		cause = trx_set_bts(obj);
+		break;
+	case NM_MT_SET_RADIO_ATTR:
+		cause = trx_set_trx(obj);
+		break;
+	case NM_MT_SET_CHAN_ATTR:
+		cause = trx_set_ts(obj);
+		break;
+	}
+
+	return oml_fom_ack_nack(msg, cause);
+}
+
+/* callback from OML */
+int bts_model_opstart(struct gsm_bts *bts, struct gsm_abis_mo *mo,
+		      void *obj)
+{
+	int rc;
+
+	switch (mo->obj_class) {
+	case NM_OC_RADIO_CARRIER:
+		/* activate tranceiver */
+		rc = trx_init(obj);
+		break;
+	case NM_OC_CHANNEL:
+		/* configure timeslot */
+		rc = 0; //ts_connect(obj);
+
+		/* Set to Operational State: Enabled */
+		oml_mo_state_chg(mo, NM_OPSTATE_ENABLED, NM_AVSTATE_OK);
+
+		/* Send OPSTART ack */
+		rc = oml_mo_opstart_ack(mo);
+
+		break;
+	case NM_OC_BTS:
+	case NM_OC_SITE_MANAGER:
+	case NM_OC_BASEB_TRANSC:
+	case NM_OC_GPRS_NSE:
+	case NM_OC_GPRS_CELL:
+	case NM_OC_GPRS_NSVC:
+		oml_mo_state_chg(mo, NM_OPSTATE_ENABLED, -1);
+		rc = oml_mo_opstart_ack(mo);
+		break;
+	default:
+		rc = oml_mo_opstart_nack(mo, NM_NACK_OBJCLASS_NOTSUPP);
+	}
+	return rc;
+}
+
+int bts_model_chg_adm_state(struct gsm_bts *bts, struct gsm_abis_mo *mo,
+			    void *obj, uint8_t adm_state)
+{
+	/* blindly accept all state changes */
+	mo->nm_state.administrative = adm_state;
+	return oml_mo_statechg_ack(mo);
+}
+
+int bts_model_trx_deact_rf(struct gsm_bts_trx *trx)
+{
+	return trx_close(trx);
+}
+
+int bts_model_oml_estab(struct gsm_bts *bts)
+{
+	return 0;
+}
+
diff --git a/src/osmo-bts-trx/l1_if.h b/src/osmo-bts-trx/l1_if.h
new file mode 100644
index 000000000..7e0f36887
--- /dev/null
+++ b/src/osmo-bts-trx/l1_if.h
@@ -0,0 +1,121 @@
+#ifndef L1_IF_H_TRX
+#define L1_IF_H_TRX
+
+/* These types define the different channels on a multiframe.
+ * Each channel has queues and can be activated individually.
+ */
+enum trx_chan_type {
+	TRXC_IDLE = 0,
+	TRXC_FCCH,
+	TRXC_SCH,
+	TRXC_BCCH,
+	TRXC_RACH,
+	TRXC_CCCH,
+	TRXC_TCHF,
+	TRXC_TCHH_0,
+	TRXC_TCHH_1,
+	TRXC_SDCCH4_0,
+	TRXC_SDCCH4_1,
+	TRXC_SDCCH4_2,
+	TRXC_SDCCH4_3,
+	TRXC_SDCCH8_0,
+	TRXC_SDCCH8_1,
+	TRXC_SDCCH8_2,
+	TRXC_SDCCH8_3,
+	TRXC_SDCCH8_4,
+	TRXC_SDCCH8_5,
+	TRXC_SDCCH8_6,
+	TRXC_SDCCH8_7,
+	TRXC_SACCHTF,
+	TRXC_SACCHTH_0,
+	TRXC_SACCHTH_1,
+	TRXC_SACCH4_0,
+	TRXC_SACCH4_1,
+	TRXC_SACCH4_2,
+	TRXC_SACCH4_3,
+	TRXC_SACCH8_0,
+	TRXC_SACCH8_1,
+	TRXC_SACCH8_2,
+	TRXC_SACCH8_3,
+	TRXC_SACCH8_4,
+	TRXC_SACCH8_5,
+	TRXC_SACCH8_6,
+	TRXC_SACCH8_7,
+	TRXC_PDTCH,
+	TRXC_PTCCH,
+	_TRX_CHAN_MAX
+};
+
+/* States each channel on a multiframe */
+struct trx_chan_state {
+	uint8_t			dl_active;	/* Channel is active for TX */
+	uint8_t			ul_active;	/* Channel is active for RX */
+	ubit_t			*dl_bursts;	/* burst buffer for TX */
+	sbit_t			*ul_bursts;	/* burst buffer for RX */
+	uint32_t		ul_first_fn;	/* fn of first burst */
+	uint8_t			ul_mask;	/* mask of received bursts */
+	uint8_t			sacch_lost;	/* SACCH loss detection */
+};
+
+struct trx_config {
+	uint8_t			poweron;	/* poweron(1) or poweroff(0) */
+	int			poweron_sent;
+
+	int			arfcn_valid;
+	uint16_t		arfcn;
+	int			arfcn_sent;
+
+	int			tsc_valid;
+	uint8_t			tsc;
+	int			tsc_sent;
+
+	int			bsic_valid;
+	uint8_t			bsic;
+	int			bsic_sent;
+
+	int			rxgain_valid;
+	int			rxgain;
+	int			rxgain_sent;
+
+	int			power_valid;
+	int			power;
+	int			power_sent;
+
+	int			maxdly_valid;
+	int			maxdly;
+	int			maxdly_sent;
+
+	uint8_t			slotmask;
+
+	int			slottype_valid[8];
+	uint8_t			slottype[8];
+	int			slottype_sent[8];
+};
+
+struct trx_l1h {
+	struct llist_head	trx_ctrl_list;
+
+	struct gsm_bts_trx	*trx;
+
+	struct osmo_fd		trx_ofd_ctrl;
+	struct osmo_timer_list	trx_ctrl_timer;
+	struct osmo_fd		trx_ofd_data;
+
+	/* tranceiver config */
+	struct trx_config	config;
+
+	uint8_t			mf_index[8];	/* selected multiframe index */
+
+	/* Channel states for all channels on all timeslots */
+	struct trx_chan_state	chan_states[8][_TRX_CHAN_MAX];
+	struct llist_head	dl_prims[8];	/* Queue primitves for TX */
+};
+
+struct trx_l1h *l1if_open(struct gsm_bts_trx *trx);
+void l1if_close(struct trx_l1h *l1h);
+void l1if_reset(struct trx_l1h *l1h);
+int l1if_provision_tranceiver_trx(struct trx_l1h *l1h);
+int l1if_provision_tranceiver(struct gsm_bts *bts);
+int l1if_mph_time_ind(struct gsm_bts *bts, uint32_t fn);
+
+#endif /* L1_IF_H_TRX */
diff --git a/src/osmo-bts-trx/main.c b/src/osmo-bts-trx/main.c
new file mode 100644
index 000000000..1b3359aad
--- /dev/null
+++ b/src/osmo-bts-trx/main.c
@@ -0,0 +1,402 @@
+/* Main program for OsmoBTS-TRX */
+
+/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <getopt.h>
+#include <limits.h>
+#include <sched.h>
+#include <sys/signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/application.h>
+#include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/logging.h>
+#include <osmocom/core/gsmtap.h>
+#include <osmocom/core/gsmtap_util.h>
+#include <osmocom/core/bits.h>
+
+#include <osmo-bts/gsm_data.h>
+#include <osmo-bts/logging.h>
+#include <osmo-bts/abis.h>
+#include <osmo-bts/bts.h>
+#include <osmo-bts/vty.h>
+#include <osmo-bts/bts_model.h>
+#include <osmo-bts/pcu_if.h>
+#include <osmo-bts/l1sap.h>
+
+#include "l1_if.h"
+#include "trx_if.h"
+#include "scheduler.h"
+
+const int pcu_direct = 0;
+
+int quit = 0;
+static const char *config_file = "osmo-bts.cfg";
+static int daemonize = 0;
+static char *gsmtap_ip = 0;
+static int high_prio = 0;
+static int trx_num = 1;
+char *software_version = "0.0";
+uint8_t abis_mac[6] = { 0, 1, 2, 3, 4, 5 };
+char *bsc_host = "localhost";
+char *bts_id = "1801/0";
+
+// FIXME this is a hack
+static void get_mac(void)
+{
+	struct if_nameindex *ifn = if_nameindex();
+	struct ifreq ifr;
+	int sock;
+	int ret;
+
+	sock = socket(AF_INET, SOCK_STREAM, 0);
+	if (sock < 0)
+		return;
+
+	memset(&ifr, 0, sizeof(ifr));
+	if (!ifn)
+		return;
+	while (ifn->if_name) {
+		strncpy(ifr.ifr_name, ifn->if_name, sizeof(ifr.ifr_name)-1);
+		ret = ioctl(sock, SIOCGIFHWADDR, &ifr);
+		if (ret == 0 && !!memcmp(ifr.ifr_hwaddr.sa_data,
+					"\0\0\0\0\0\0", 6)) {
+			memcpy(abis_mac, ifr.ifr_hwaddr.sa_data, 6);
+			printf("Using MAC address of %s: "
+				"'%02x:%02x:%02x:%02x:%02x:%02x'\n",
+				ifn->if_name,
+				abis_mac[0], abis_mac[1], abis_mac[2],
+				abis_mac[3], abis_mac[4], abis_mac[5]);
+			break;
+		}
+		ifn++;
+	}
+//	if_freenameindex(ifn);
+}
+
+int bts_model_init(struct gsm_bts *bts)
+{
+	void *l1h;
+	struct gsm_bts_trx *trx;
+
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		l1h = l1if_open(trx);
+		if (!l1h) {
+			LOGP(DL1C, LOGL_FATAL, "Cannot open L1 Interface\n");
+			goto error;
+		}
+
+		trx->role_bts.l1h = l1h;
+		trx->nominal_power = 23;
+
+		l1if_reset(l1h);
+	}
+
+	bts_model_vty_init(bts);
+
+	return 0;
+
+error:
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		l1h = trx->role_bts.l1h;
+		if (l1h)
+			l1if_close(l1h);
+	}
+
+	return -EIO;
+}
+
+/* dummy, since no direct dsp support */
+uint32_t trx_get_hlayer1(struct gsm_bts_trx *trx)
+{
+	return 0;
+}
+
+static void print_help()
+{
+	printf( "Some useful options:\n"
+		"  -h	--help		this text\n"
+		"  -d	--debug MASK	Enable debugging (e.g. -d DRSL:DOML:DLAPDM)\n"
+		"  -D	--daemonize	For the process into a background daemon\n"
+		"  -c	--config-file 	Specify the filename of the config file\n"
+		"  -s	--disable-color	Don't use colors in stderr log output\n"
+		"  -T	--timestamp	Prefix every log line with a timestamp\n"
+		"  -V	--version	Print version information and exit\n"
+		"  -e	--log-level	Set a global log-level\n"
+		"  -t	--trx-num	Set number of TRX (default=%d)\n"
+		"  -i	--gsmtap-ip	The destination IP used for GSMTAP.\n"
+		"  -H	--high-prio	Set realtime scheduler with maximum prio\n"
+		"  -I	--tranceiver-ip	Set IP of tranceiver (default=%s)\n"
+		,trx_num, tranceiver_ip);
+}
+
+/* FIXME: finally get some option parsing code into libosmocore */
+static void handle_options(int argc, char **argv)
+{
+	while (1) {
+		int option_idx = 0, c;
+		static const struct option long_options[] = {
+			/* FIXME: all those are generic Osmocom app options */
+			{ "help", 0, 0, 'h' },
+			{ "debug", 1, 0, 'd' },
+			{ "daemonize", 0, 0, 'D' },
+			{ "config-file", 1, 0, 'c' },
+			{ "disable-color", 0, 0, 's' },
+			{ "timestamp", 0, 0, 'T' },
+			{ "version", 0, 0, 'V' },
+			{ "log-level", 1, 0, 'e' },
+			{ "trx-num", 1, 0, 't' },
+			{ "gsmtap-ip", 1, 0, 'i' },
+			{ "high-prio", 0, 0, 'H' },
+			{ "tranceiver-ip", 1, 0, 'I' },
+			{ 0, 0, 0, 0 }
+		};
+
+		c = getopt_long(argc, argv, "hc:d:Dc:sTVe:t:i:HI:",
+				long_options, &option_idx);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			print_help();
+			exit(0);
+			break;
+		case 's':
+			log_set_use_color(osmo_stderr_target, 0);
+			break;
+		case 'd':
+			log_parse_category_mask(osmo_stderr_target, optarg);
+			break;
+		case 'D':
+			daemonize = 1;
+			break;
+		case 'c':
+			config_file = strdup(optarg);
+			break;
+		case 'T':
+			log_set_print_timestamp(osmo_stderr_target, 1);
+			break;
+		case 'V':
+			print_version(1);
+			exit(0);
+			break;
+		case 'e':
+			log_set_log_level(osmo_stderr_target, atoi(optarg));
+			break;
+		case 't':
+			trx_num = atoi(optarg);
+			if (trx_num < 1)
+				trx_num = 1;
+			break;
+		case 'i':
+			gsmtap_ip = optarg;
+			break;
+		case 'H':
+			high_prio = 1;
+			break;
+		case 'I':
+			tranceiver_ip = strdup(optarg);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+static struct gsm_bts *bts;
+
+static void signal_handler(int signal)
+{
+	fprintf(stderr, "signal %u received\n", signal);
+
+	switch (signal) {
+	case SIGINT:
+		//osmo_signal_dispatch(SS_GLOBAL, S_GLOBAL_SHUTDOWN, NULL);
+		if (!quit)
+			bts_shutdown(bts, "SIGINT");
+		quit++;
+		break;
+	case SIGABRT:
+	case SIGUSR1:
+	case SIGUSR2:
+		talloc_report_full(tall_bts_ctx, stderr);
+		break;
+	default:
+		break;
+	}
+}
+
+static int write_pid_file(char *procname)
+{
+	FILE *outf;
+	char tmp[PATH_MAX+1];
+
+	snprintf(tmp, sizeof(tmp)-1, "/var/run/%s.pid", procname);
+	tmp[PATH_MAX-1] = '\0';
+
+	outf = fopen(tmp, "w");
+	if (!outf)
+		return -1;
+
+	fprintf(outf, "%d\n", getpid());
+
+	fclose(outf);
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	struct gsm_bts_role_bts *btsb;
+	struct gsm_bts_trx *trx;
+	struct e1inp_line *line;
+	void *tall_msgb_ctx;
+	int rc, i;
+
+	printf("((*))\n  |\n / \\ OsmoBTS\n");
+
+	get_mac();
+
+	tall_bts_ctx = talloc_named_const(NULL, 1, "OsmoBTS context");
+	tall_msgb_ctx = talloc_named_const(tall_bts_ctx, 1, "msgb");
+	msgb_set_talloc_ctx(tall_msgb_ctx);
+
+	bts_log_init(NULL);
+
+	handle_options(argc, argv);
+
+	bts = gsm_bts_alloc(tall_bts_ctx);
+	if (!bts) {
+		fprintf(stderr, "Failed to create BTS structure\n");
+		exit(1);
+	}
+	for (i = 1; i < trx_num; i++) {
+		trx = gsm_bts_trx_alloc(bts);
+		if (!trx) {
+			fprintf(stderr, "Failed to TRX structure\n");
+			exit(1);
+		}
+	}
+
+	vty_init(&bts_vty_info);
+	e1inp_vty_init();
+	bts_vty_init(bts, &bts_log_info);
+
+	if (bts_init(bts) < 0) {
+		fprintf(stderr, "unable to to open bts\n");
+		exit(1);
+	}
+	btsb = bts_role_bts(bts);
+	btsb->support.ciphers = 0; // CIPHER_A5(1) | CIPHER_A5(2) | CIPHER_A5(3);
+
+        if (gsmtap_ip) {
+		gsmtap = gsmtap_source_init(gsmtap_ip, GSMTAP_UDP_PORT, 1);
+		if (!gsmtap) {
+			fprintf(stderr, "Failed during gsmtap_init()\n");
+			exit(1);
+		}
+		gsmtap_source_add_sink(gsmtap);
+	}
+
+	rc = vty_read_config_file(config_file, NULL);
+	if (rc < 0) {
+		fprintf(stderr, "Failed to parse the config file: '%s'\n",
+			config_file);
+		exit(1);
+	}
+
+	write_pid_file("osmo-bts");
+
+	rc = telnet_init(tall_bts_ctx, NULL, 4241);
+	if (rc < 0) {
+		fprintf(stderr, "Error initializing telnet\n");
+		exit(1);
+	}
+
+	if (pcu_sock_init()) {
+		fprintf(stderr, "PCU L1 socket failed\n");
+		exit(-1);
+	}
+
+	signal(SIGINT, &signal_handler);
+	//signal(SIGABRT, &signal_handler);
+	signal(SIGUSR1, &signal_handler);
+	signal(SIGUSR2, &signal_handler);
+	osmo_init_ignore_signals();
+
+	if (!btsb->bsc_oml_host) {
+		fprintf(stderr, "Cannot start BTS without knowing BSC OML IP\n");
+		exit(1);
+	}
+
+	line = abis_open(bts, btsb->bsc_oml_host, "sysmoBTS");
+	if (!line) {
+		fprintf(stderr, "unable to connect to BSC\n");
+		exit(1);
+	}
+
+	if (daemonize) {
+		rc = osmo_daemonize();
+		if (rc < 0) {
+			perror("Error during daemonize");
+			exit(1);
+		}
+	}
+
+	if (high_prio) {
+		struct sched_param schedp;
+
+		/* high priority scheduling required for handling bursts */
+		rc = sched_get_priority_max(SCHED_RR);
+		memset(&schedp, 0, sizeof(schedp));
+		schedp.sched_priority = rc;
+		rc = sched_setscheduler(0, SCHED_RR, &schedp);
+		if (rc) {
+			fprintf(stderr, "Error setting scheduler\n");
+		}
+	}
+
+	while (quit < 2) {
+		log_reset_context();
+		osmo_select_main(0);
+	}
+
+#if 0
+	telnet_exit();
+
+	talloc_report_full(tall_bts_ctx, stderr);
+#endif
+
+	return 0;
+}
+
diff --git a/src/osmo-bts-trx/pxxch.c b/src/osmo-bts-trx/pxxch.c
new file mode 100644
index 000000000..17a7c9474
--- /dev/null
+++ b/src/osmo-bts-trx/pxxch.c
@@ -0,0 +1,473 @@
+/*
+ * pxxch.c
+ *
+ * Copyright (c) 2013  Andreas Eversberg <jolly@eversberg.eu>
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/conv.h>
+#include <osmocom/core/crcgen.h>
+
+#include "pxxch.h"
+
+
+/*
+ * GSM PDTCH parity (FIRE code)
+ *
+ * g(x) = (x^23 + 1)(x^17 + x^3 + 1)
+ *      = x^40 + x^26 + x^23 + x^17 + x^3 + 1
+ */
+
+const struct osmo_crc64gen_code pxxch_crc40 = {
+	.bits = 40,
+	.poly = 0x0004820009ULL,
+	.init = 0x0000000000ULL,
+	.remainder = 0xffffffffffULL,
+};
+
+
+/*
+ * GSM PDTCH CS-2, CS-3 parity
+ *
+ * g(x) = x^16 + x^12 + x^5 + 1
+ */
+
+const struct osmo_crc16gen_code pdtch_crc16 = {
+	.bits = 16,
+	.poly = 0x1021,
+	.init = 0x0000,
+	.remainder = 0xffff,
+};
+
+
+/*
+ * GSM PDTCH convolutional coding
+ *
+ * G_0 = 1 + x^3 + x^4
+ * G_1 = 1 + x + x^3 + x^4
+ */
+
+static const uint8_t conv_cs1_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+
+static const uint8_t conv_cs1_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+
+static const struct osmo_conv_code conv_cs1 = {
+	.N = 2,
+	.K = 5,
+	.len = 224,
+	.next_output = conv_cs1_next_output,
+	.next_state  = conv_cs1_next_state,
+};
+
+static const uint8_t conv_cs2_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+
+static const uint8_t conv_cs2_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+
+static const struct osmo_conv_code conv_cs2 = {
+	.N = 2,
+	.K = 5,
+	.len = 290,
+	.next_output = conv_cs2_next_output,
+	.next_state  = conv_cs2_next_state,
+};
+
+static const uint8_t conv_cs3_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+
+static const uint8_t conv_cs3_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+
+static const struct osmo_conv_code conv_cs3 = {
+	.N = 2,
+	.K = 5,
+	.len = 334,
+	.next_output = conv_cs3_next_output,
+	.next_state  = conv_cs3_next_state,
+};
+
+
+/*
+ * GSM PxxCH interleaving and burst mapping
+ *
+ * Interleaving:
+ *
+ * Given 456 coded input bits, form 4 blocks of 114 bits:
+ *
+ *      i(B, j) = c(n, k)       k = 0, ..., 455
+ *                              n = 0, ..., N, N + 1, ...
+ *                              B = B_0 + 4n + (k mod 4)
+ *                              j = 2(49k mod 57) + ((k mod 8) div 4)
+ *
+ * Mapping on Burst:
+ *
+ *      e(B, j) = i(B, j)
+ *      e(B, 59 + j) = i(B, 57 + j)     j = 0, ..., 56
+ *      e(B, 57) = h_l(B)
+ *      e(B, 58) = h_n(B)
+ *
+ * Where hl(B) and hn(B) are bits in burst B indicating flags.
+ */
+
+static void
+pxxch_deinterleave(sbit_t *cB, sbit_t *iB)
+{
+	int j, k, B;
+
+	for (k=0; k<456; k++) {
+		B = k & 3;
+		j = 2 * ((49 * k) % 57) + ((k & 7) >> 2);
+		cB[k] = iB[B * 114 + j];
+	}
+}
+
+static void
+pxxch_interleave(ubit_t *cB, ubit_t *iB)
+{
+	int j, k, B;
+
+	for (k=0; k<456; k++) {
+		B = k & 3;
+		j = 2 * ((49 * k) % 57) + ((k & 7) >> 2);
+		iB[B * 114 + j] = cB[k];
+	}
+}
+
+static void
+pxxch_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *hl, sbit_t *hn)
+{
+	memcpy(iB,    eB,    57);
+	memcpy(iB+57, eB+59, 57);
+
+	if (hl)
+		*hl = eB[57];
+
+	if (hn)
+		*hn = eB[58];
+}
+
+static void
+pxxch_burst_map(ubit_t *iB, ubit_t *eB, ubit_t *hl, ubit_t *hn)
+{
+	memcpy(eB,    iB,    57);
+	memcpy(eB+59, iB+57, 57);
+
+	if (hl)
+		eB[57] = *hl;
+	if (hn)
+		eB[58] = *hn;
+}
+
+static ubit_t pdtch_hl_hn[4][8] = {
+	{ 1,1, 1,1, 1,1, 1,1 },
+	{ 1,1, 0,0, 1,0, 0,0 },
+	{ 0,0, 1,0, 0,0, 0,1 },
+	{ 0,0, 0,1, 0,1, 1,0 },
+};
+
+static ubit_t usf2six[8][6] = {
+	{ 0,0,0, 0,0,0 },
+	{ 0,0,1, 0,1,1 },
+	{ 0,1,0, 1,1,0 },
+	{ 0,1,1, 1,0,1 },
+	{ 1,0,0, 1,0,1 },
+	{ 1,0,1, 1,1,0 },
+	{ 1,1,0, 0,1,1 },
+	{ 1,1,1, 0,0,0 },
+};
+
+static ubit_t usf2twelve[8][12] = {
+	{ 0,0,0, 0,0,0, 0,0,0, 0,0,0 },
+	{ 0,0,0, 0,1,1, 0,1,1, 1,0,1 },
+	{ 0,0,1, 1,0,1, 1,1,0, 1,1,0 },
+	{ 0,0,1, 1,1,0, 1,0,1, 0,1,1 },
+	{ 1,1,0, 1,0,0, 0,0,1, 0,1,1 },
+	{ 1,1,0, 1,1,1, 0,1,0, 1,1,0 },
+	{ 1,1,1, 0,0,1, 1,1,1, 1,0,1 },
+	{ 1,1,1, 0,1,0, 1,0,0, 0,0,0 },
+};
+
+static uint8_t puncture_cs2[588] = {
+	0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,1, 0,0,0,0, 0,0,0,1, 0,0,0,1,
+	0,0,0,1, 0,0,0,1, 0,0,0,1
+};
+
+static uint8_t puncture_cs3[676] = {
+	0,0,0,0,0,0, 0,0,0,0,0,0, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,1,0,1,
+	0,0,0,1,0,1, 0,0,0,1,0,1, 0,0,0,0
+};
+
+int
+pdch_decode(uint8_t *l2_data, sbit_t *bursts, uint8_t *usf_p)
+{
+	sbit_t iB[456], cB[676], hl_hn[8];
+	ubit_t conv[456];
+	int i, j, k, rv, best, cs, usf;
+
+	for (i=0; i<4; i++)
+		pxxch_burst_unmap(&iB[i * 114], &bursts[i * 116], hl_hn + i*2,
+			hl_hn + i*2 + 1);
+
+	for (i=0, best=0, cs=1; i<4; j++) {
+		for (j=0, k=0; j<4; j++) {
+			if (pdtch_hl_hn[i][j] == hl_hn[j])
+				k++;
+		}
+		if (k > best)
+			cs = i+1;
+	}
+
+	pxxch_deinterleave(cB, iB);
+
+	switch (cs) {
+	case 1:
+		osmo_conv_decode(&conv_cs1, cB, conv);
+
+		rv = osmo_crc64gen_check_bits(&pxxch_crc40, conv, 184,
+			conv+184);
+		if (rv)
+			return -1;
+
+		osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 184, 1);
+
+		return 23;
+	case 2:
+		for (i=587, j=455; i>=0; i++)
+			if (!puncture_cs2[i])
+				cB[i] = cB[j--];
+			else
+				cB[i] = 0;
+
+		osmo_conv_decode(&conv_cs2, cB, conv);
+
+		for (i=0, best=0, usf=0; i<8; j++) {
+			for (j=0, k=0; j<6; j++) {
+				if (usf2six[i][j] == conv[j])
+					k++;
+			}
+			if (k > best)
+				usf = i;
+		}
+
+		conv[3] = (usf >> 2) & 1;
+		conv[4] = (usf >> 1) & 1;
+		conv[5] = usf & 1;
+		if (usf_p)
+			*usf_p = usf;
+
+		rv = osmo_crc64gen_check_bits(&pxxch_crc40, conv+3, 271,
+			conv+3+271);
+		if (rv)
+			return -1;
+
+		osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 271, 1);
+
+		return 34;
+	case 3:
+		for (i=675, j=455; i>=0; i++)
+			if (!puncture_cs3[i])
+				cB[i] = cB[j--];
+			else
+				cB[i] = 0;
+
+		osmo_conv_decode(&conv_cs3, cB, conv);
+
+		for (i=0, best=0, usf=0; i<8; j++) {
+			for (j=0, k=0; j<6; j++) {
+				if (usf2six[i][j] == conv[j])
+					k++;
+			}
+			if (k > best)
+				usf = i;
+		}
+
+		conv[3] = (usf >> 2) & 1;
+		conv[4] = (usf >> 1) & 1;
+		conv[5] = usf & 1;
+		if (usf_p)
+			*usf_p = usf;
+
+		rv = osmo_crc64gen_check_bits(&pxxch_crc40, conv+3, 315,
+			conv+3+315);
+		if (rv)
+			return -1;
+
+		osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 315, 1);
+
+		return 40;
+	case 4:
+		for (i=0; i<456;i++)
+			conv[i] = (cB[i] < 0) ? 1:0;
+
+		for (i=0, best=0, usf=0; i<8; j++) {
+			for (j=0, k=0; j<12; j++) {
+				if (usf2twelve[i][j] == conv[j])
+					k++;
+			}
+			if (k > best)
+				usf = i;
+		}
+
+		conv[9] = (usf >> 2) & 1;
+		conv[10] = (usf >> 1) & 1;
+		conv[11] = usf & 1;
+		if (usf_p)
+			*usf_p = usf;
+
+		rv = osmo_crc64gen_check_bits(&pxxch_crc40, conv+9, 431,
+			conv+9+431);
+		if (rv)
+			return -1;
+
+		osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 431, 1);
+
+		return 54;
+	}
+
+	return -1;
+}
+
+int
+pdtch_encode(ubit_t *bursts, uint8_t *l2_data, uint8_t l2_len)
+{
+	ubit_t iB[456], cB[676], *hl_hn;
+	ubit_t conv[334];
+	int i, j, usf;
+
+	switch (l2_len) {
+	case 23:
+		osmo_pbit2ubit_ext(conv, 0, l2_data, 0, 184, 1);
+
+		osmo_crc64gen_set_bits(&pxxch_crc40, conv, 184, conv+184);
+
+		osmo_conv_encode(&conv_cs1, conv, cB);
+
+		hl_hn = pdtch_hl_hn[0];
+
+		break;
+	case 34:
+		osmo_pbit2ubit_ext(conv, 3, l2_data, 0, 271, 1);
+		usf = (conv[3] << 2) | (conv[4] << 1) | conv[5];
+
+		osmo_crc16gen_set_bits(&pdtch_crc16, conv+3, 271, conv+3+271);
+
+		memcpy(conv, usf2six[usf], 6);
+
+		osmo_conv_encode(&conv_cs2, conv, cB);
+
+		for (i=0, j=0; i<588; i++)
+			if (!puncture_cs2[i])
+				cB[j++] = cB[i];
+
+		hl_hn = pdtch_hl_hn[1];
+
+		break;
+	case 40:
+		osmo_pbit2ubit_ext(conv, 3, l2_data, 0, 315, 1);
+		usf = (conv[3] << 2) | (conv[4] << 1) | conv[5];
+
+		osmo_crc16gen_set_bits(&pdtch_crc16, conv+3, 315, conv+3+315);
+
+		memcpy(conv, usf2six[usf], 6);
+
+		osmo_conv_encode(&conv_cs3, conv, cB);
+
+		for (i=0, j=0; i<676; i++)
+			if (!puncture_cs3[i])
+				cB[j++] = cB[i];
+
+		hl_hn = pdtch_hl_hn[2];
+
+		break;
+	case 54:
+		osmo_pbit2ubit_ext(cB, 9, l2_data, 0, 431, 1);
+		usf = (cB[9] << 2) | (cB[10] << 1) | conv[11];
+
+		osmo_crc16gen_set_bits(&pdtch_crc16, cB+9, 431, cB+9+431);
+
+		memcpy(cB, usf2twelve[usf], 12);
+
+		hl_hn = pdtch_hl_hn[3];
+
+		break;
+	default:
+		return -1;
+	}
+
+	pxxch_interleave(cB, iB);
+
+	for (i=0; i<4; i++)
+		pxxch_burst_map(&iB[i * 114], &bursts[i * 116], hl_hn + i*2,
+			hl_hn + i*2 + 1);
+
+	return 0;
+}
diff --git a/src/osmo-bts-trx/pxxch.h b/src/osmo-bts-trx/pxxch.h
new file mode 100644
index 000000000..313fbf59a
--- /dev/null
+++ b/src/osmo-bts-trx/pxxch.h
@@ -0,0 +1,7 @@
+#ifndef _PXXCH_H
+#define _PXXCH_H
+
+int pdch_decode(uint8_t *l2_data, sbit_t *bursts, uint8_t *usf_p);
+int pdtch_encode(ubit_t *bursts, uint8_t *l2_data, uint8_t l2_len);
+
+#endif /* _PXXCH_H */
diff --git a/src/osmo-bts-trx/rach.c b/src/osmo-bts-trx/rach.c
new file mode 100644
index 000000000..670a4d1da
--- /dev/null
+++ b/src/osmo-bts-trx/rach.c
@@ -0,0 +1,118 @@
+/*
+ * conv_rach.c
+ *
+ * Convolutional code tables for RACH channels
+ *
+ * Copyright (C) 2011  Sylvain Munaut <tnt@246tNt.com>
+ */
+     
+     
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+     
+#include <osmocom/core/bits.h>
+#include <osmocom/core/conv.h>
+#include <osmocom/core/crcgen.h>
+
+#include "rach.h"
+
+
+/*
+ * GSM RACH parity
+ *
+ * g(x) = x^6 + x^5 + x^3 + x^2 + x^1 + 1
+ */
+
+static const struct osmo_crc8gen_code rach_crc6 = {
+	.bits = 6,
+	.poly = 0x2f,
+	.init = 0x00,
+	.remainder = 0x3f,
+};
+
+
+/*
+ * GSM RACH convolutional coding
+ *
+ * G_0 = 1 + x^3 + x^4
+ * G_1 = 1 + x + x^3 + x^4
+ */
+
+static const uint8_t conv_rach_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+     
+static const uint8_t conv_rach_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+     
+const struct osmo_conv_code conv_rach = {
+	.N = 2,
+	.K = 5,
+	.len = 14,
+	.next_output = conv_rach_next_output,
+	.next_state  = conv_rach_next_state,
+};
+ 
+
+/*
+ * GSM RACH apply BSIC to parity
+ *
+ * p(j) = p(j) xor b(j)     j = 0, ..., 5
+ * b(0) = MSB of PLMN colour code
+ * b(5) = LSB of BS colour code
+ */
+
+static int
+rach_apply_bsic(ubit_t *d, uint8_t bsic)
+{
+	int i;
+
+	/* Apply it */
+	for (i=0; i<6; i++)
+		d[8+i] ^= ((bsic >> (5-i)) & 1);
+
+	return 0;
+}
+
+int
+rach_decode(uint8_t *ra, sbit_t *burst, uint8_t bsic)
+{
+	ubit_t conv[14];
+	int rv;
+
+	osmo_conv_decode(&conv_rach, burst, conv);
+
+	rach_apply_bsic(conv, bsic);
+
+	rv = osmo_crc8gen_check_bits(&rach_crc6, conv, 8, conv+8);
+	if (rv)
+		return -1;
+
+	osmo_ubit2pbit_ext(ra, 0, conv, 0, 8, 1);
+
+	return 0;
+}
+
+int
+rach_encode(ubit_t *burst, uint8_t *ra, uint8_t bsic)
+{
+	ubit_t conv[14];
+
+	osmo_pbit2ubit_ext(conv, 0, ra, 0, 8, 1);
+
+	osmo_crc8gen_set_bits(&rach_crc6, conv, 8, conv+8);
+
+	rach_apply_bsic(conv, bsic);
+
+	osmo_conv_encode(&conv_rach, conv, burst);
+
+	return 0;
+}
diff --git a/src/osmo-bts-trx/rach.h b/src/osmo-bts-trx/rach.h
new file mode 100644
index 000000000..155555939
--- /dev/null
+++ b/src/osmo-bts-trx/rach.h
@@ -0,0 +1,7 @@
+#ifndef _RACH_H
+#define _RACH_H
+
+int rach_decode(uint8_t *ra, sbit_t *burst, uint8_t bsic);
+int rach_encode(ubit_t *burst, uint8_t *ra, uint8_t bsic);
+
+#endif /* _RACH_H */
diff --git a/src/osmo-bts-trx/sch.c b/src/osmo-bts-trx/sch.c
new file mode 100644
index 000000000..e0d6e8dbf
--- /dev/null
+++ b/src/osmo-bts-trx/sch.c
@@ -0,0 +1,89 @@
+/*
+ */
+     
+     
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+     
+#include <osmocom/core/bits.h>
+#include <osmocom/core/conv.h>
+#include <osmocom/core/crcgen.h>
+
+#include "sch.h"
+
+
+/*
+ * GSM SCH parity
+ *
+ * g(x) = x^10 + x^8 + x^6 + x^5 + x^4 + x^2 + 1
+ */
+
+const struct osmo_crc16gen_code sch_crc10 = {
+	.bits = 10,
+	.poly = 0x175,
+	.init = 0x000,
+	.remainder = 0x3ff,
+};
+
+
+/*
+ * GSM SCH convolutional coding
+ *
+ * G_0 = 1 + x^3 + x^4
+ * G_1 = 1 + x + x^3 + x^4
+ */
+
+static const uint8_t conv_rach_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+     
+static const uint8_t conv_rach_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+     
+static const struct osmo_conv_code conv_sch = {
+	.N = 2,
+	.K = 5,
+	.len = 35,
+	.next_output = conv_rach_next_output,
+	.next_state  = conv_rach_next_state,
+};
+ 
+
+int
+sch_decode(uint8_t *sb_info, sbit_t *burst)
+{
+	ubit_t conv[35];
+	int rv;
+
+	osmo_conv_decode(&conv_sch, burst, conv);
+
+	rv = osmo_crc16gen_check_bits(&sch_crc10, conv, 25, conv+25);
+	if (rv)
+		return -1;
+
+	osmo_ubit2pbit_ext(sb_info, 0, conv, 0, 25, 1);
+
+	return 0;
+}
+
+int
+sch_encode(ubit_t *burst, uint8_t *sb_info)
+{
+	ubit_t conv[35];
+
+	osmo_pbit2ubit_ext(conv, 0, sb_info, 0, 25, 1);
+
+	osmo_crc16gen_set_bits(&sch_crc10, conv, 25, conv+25);
+
+	osmo_conv_encode(&conv_sch, conv, burst);
+
+	return 0;
+}
diff --git a/src/osmo-bts-trx/sch.h b/src/osmo-bts-trx/sch.h
new file mode 100644
index 000000000..8e60191b7
--- /dev/null
+++ b/src/osmo-bts-trx/sch.h
@@ -0,0 +1,7 @@
+#ifndef _SCH_H
+#define _SCH_H
+
+int sch_decode(uint8_t *sb_info, sbit_t *burst);
+int sch_encode(ubit_t *burst, uint8_t *sb_info);
+
+#endif /* _SCH_H */
diff --git a/src/osmo-bts-trx/scheduler.c b/src/osmo-bts-trx/scheduler.c
new file mode 100644
index 000000000..a0caeecaf
--- /dev/null
+++ b/src/osmo-bts-trx/scheduler.c
@@ -0,0 +1,1987 @@
+/* Scheduler for OsmoBTS-TRX */
+
+/* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/bits.h>
+
+#include <osmo-bts/gsm_data.h>
+#include <osmo-bts/logging.h>
+#include <osmo-bts/rsl.h>
+#include <osmo-bts/l1sap.h>
+
+#include "l1_if.h"
+#include "scheduler.h"
+#include "xcch.h"
+#include "tch_fr.h"
+#include "rach.h"
+#include "sch.h"
+#include "pxxch.h"
+#include "trx_if.h"
+
+void *tall_bts_ctx;
+
+static struct gsm_bts *bts;
+
+/* clock states */
+static uint32_t tranceiver_lost;
+uint32_t tranceiver_last_fn;
+static struct timeval tranceiver_clock_tv;
+static struct osmo_timer_list tranceiver_clock_timer;
+
+/* clock advance for the tranceiver */
+uint32_t trx_clock_advance = 10;
+
+/* advance RTS to give some time for data processing. (especially PCU) */
+uint32_t trx_rts_advance = 5; /* about 20ms */
+
+typedef int trx_sched_rts_func(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan);
+typedef const ubit_t *trx_sched_dl_func(struct trx_l1h *l1h, uint8_t tn,
+	uint32_t fn, enum trx_chan_type chan, uint8_t bid);
+typedef int trx_sched_ul_func(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa);
+
+static int rts_data_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan);
+static int rts_tch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan);
+static const ubit_t *tx_idle_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid);
+static const ubit_t *tx_fcch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid);
+static const ubit_t *tx_sch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid);
+static const ubit_t *tx_data_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid);
+static const ubit_t *tx_pdtch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid);
+static const ubit_t *tx_tchf_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid);
+static const ubit_t *tx_tchh_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid);
+static int rx_rach_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa);
+static int rx_data_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa);
+static int rx_pdtch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa);
+static int rx_tchf_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa);
+static int rx_tchh_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa);
+
+static const ubit_t dummy_burst[148] = {
+	0,0,0,
+	1,1,1,1,1,0,1,1,0,1,1,1,0,1,1,0,0,0,0,0,1,0,1,0,0,1,0,0,1,1,1,0,
+	0,0,0,0,1,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,1,1,1,0,0,
+	0,1,0,1,1,1,0,0,0,1,0,1,1,1,0,0,0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,0,
+	0,0,1,1,0,0,1,1,0,0,1,1,1,0,0,1,1,1,1,0,1,0,0,1,1,1,1,1,0,0,0,1,
+	0,0,1,0,1,1,1,1,1,0,1,0,1,0,
+	0,0,0,
+};
+
+static const ubit_t fcch_burst[148] = {
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+};
+
+static const ubit_t tsc[8][26] = {
+	{ 0,0,1,0,0,1,0,1,1,1,0,0,0,0,1,0,0,0,1,0,0,1,0,1,1,1, },
+	{ 0,0,1,0,1,1,0,1,1,1,0,1,1,1,1,0,0,0,1,0,1,1,0,1,1,1, },
+	{ 0,1,0,0,0,0,1,1,1,0,1,1,1,0,1,0,0,1,0,0,0,0,1,1,1,0, },
+	{ 0,1,0,0,0,1,1,1,1,0,1,1,0,1,0,0,0,1,0,0,0,1,1,1,1,0, },
+	{ 0,0,0,1,1,0,1,0,1,1,1,0,0,1,0,0,0,0,0,1,1,0,1,0,1,1, },
+	{ 0,1,0,0,1,1,1,0,1,0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,0, },
+	{ 1,0,1,0,0,1,1,1,1,1,0,1,1,0,0,0,1,0,1,0,0,1,1,1,1,1, },
+	{ 1,1,1,0,1,1,1,1,0,0,0,1,0,0,1,0,1,1,1,0,1,1,1,1,0,0, },
+};
+
+static const ubit_t sch_train[64] = {
+	1,0,1,1,1,0,0,1,0,1,1,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,1,1,1,1,
+	0,0,1,0,1,1,0,1,0,1,0,0,0,1,0,1,0,1,1,1,0,1,1,0,0,0,0,1,1,0,1,1,
+};
+
+/*
+ * subchannel description structure
+ */
+
+struct trx_chan_desc {
+	enum trx_chan_type	chan;
+	uint8_t			chan_nr;
+	uint8_t			link_id;
+	const char		*name;
+	trx_sched_rts_func	*rts_fn;
+	trx_sched_dl_func	*dl_fn;
+	trx_sched_ul_func	*ul_fn;
+	int			auto_active;
+};
+struct trx_chan_desc trx_chan_desc[_TRX_CHAN_MAX] = {
+      {	TRXC_IDLE,	0,	0,	"IDLE",		NULL,		tx_idle_fn,	NULL,		1 },
+      {	TRXC_FCCH,	0,	0,	"FCCH",		NULL,		tx_fcch_fn,	NULL,		1 },
+      {	TRXC_SCH,	0,	0,	"SCH",		NULL,		tx_sch_fn,	NULL,		1 },
+      {	TRXC_BCCH,	0x80,	0x00,	"BCCH",		rts_data_fn,	tx_data_fn,	NULL,		1 },
+      {	TRXC_RACH,	0x88,	0x00,	"RACH",		NULL,		NULL,		rx_rach_fn,	1 },
+      {	TRXC_CCCH,	0x90,	0x00,	"CCCH",		rts_data_fn,	tx_data_fn,	NULL,		1 },
+      {	TRXC_TCHF,	0x08,	0x00,	"TCH/F",	rts_tch_fn,	tx_tchf_fn,	rx_tchf_fn,	0 },
+      {	TRXC_TCHH_0,	0x10,	0x00,	"TCH/H(0)",	rts_tch_fn,	tx_tchh_fn,	rx_tchh_fn,	0 },
+      {	TRXC_TCHH_1,	0x18,	0x00,	"TCH/H(1)",	rts_tch_fn,	tx_tchh_fn,	rx_tchh_fn,	0 },
+      {	TRXC_SDCCH4_0,	0x20,	0x00,	"SDCCH/4(0)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH4_1,	0x28,	0x00,	"SDCCH/4(1)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH4_2,	0x30,	0x00,	"SDCCH/4(2)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH4_3,	0x38,	0x00,	"SDCCH/4(3)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH8_0,	0x40,	0x00,	"SDCCH/8(0)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH8_1,	0x48,	0x00,	"SDCCH/8(1)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },    
+      {	TRXC_SDCCH8_2,	0x50,	0x00,	"SDCCH/8(2)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH8_3,	0x58,	0x00,	"SDCCH/8(3)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH8_4,	0x60,	0x00,	"SDCCH/8(4)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH8_5,	0x68,	0x00,	"SDCCH/8(5)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH8_6,	0x70,	0x00,	"SDCCH/8(6)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SDCCH8_7,	0x78,	0x00,	"SDCCH/8(7)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCHTF,	0x08,	0x40,	"SACCH/TF",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCHTH_0,	0x10,	0x40,	"SACCH/TH(0)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCHTH_1,	0x18,	0x40,	"SACCH/TH(1)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH4_0, 	0x20,	0x40,	"SACCH/4(0)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH4_1,	0x28,	0x40,	"SACCH/4(1)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH4_2,	0x30,	0x40,	"SACCH/4(2)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH4_3,	0x38,	0x40,	"SACCH/4(3)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH8_0,	0x40,	0x40,	"SACCH/8(0)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 }, 
+      {	TRXC_SACCH8_1,	0x48,	0x40,	"SACCH/8(1)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH8_2,	0x50,	0x40,	"SACCH/8(2)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH8_3,	0x58,	0x40,	"SACCH/8(3)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH8_4,	0x60,	0x40,	"SACCH/8(4)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH8_5,	0x68,	0x40,	"SACCH/8(5)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH8_6,	0x70,	0x40,	"SACCH/8(6)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_SACCH8_7,	0x68,	0x40,	"SACCH/8(7)",	rts_data_fn,	tx_data_fn,	rx_data_fn,	0 },
+      {	TRXC_PDTCH,	0x08,	0x00,	"PDTCH",	rts_data_fn,	tx_pdtch_fn,	rx_pdtch_fn,	0 },
+      {	TRXC_PTCCH,	0x08,	0x00,	"PTCCH",	rts_data_fn,	tx_pdtch_fn,	rx_pdtch_fn,	0 },
+};
+
+
+/*
+ * init / exit
+ */
+
+int trx_sched_init(struct trx_l1h *l1h)
+{
+	uint8_t tn;
+	int i;
+	struct trx_chan_state *chan_state;
+
+	LOGP(DL1C, LOGL_NOTICE, "Init scheduler for trx=%u\n", l1h->trx->nr);
+
+	/* hack to get bts */
+	bts = l1h->trx->bts;
+
+	for (tn = 0; tn < 8; tn++) {
+		l1h->mf_index[tn] = 0;
+		for (i = 0; i < _TRX_CHAN_MAX; i++) {
+			INIT_LLIST_HEAD(&l1h->dl_prims[tn]);
+			chan_state = &l1h->chan_states[tn][i];
+			chan_state->ul_mask = 0x0;
+		}
+	}
+
+	return 0;
+}
+
+void trx_sched_exit(struct trx_l1h *l1h)
+{
+	uint8_t tn;
+	int i;
+	struct trx_chan_state *chan_state;
+
+	LOGP(DL1C, LOGL_NOTICE, "Exit scheduler for trx=%u\n", l1h->trx->nr);
+
+	for (tn = 0; tn < 8; tn++) {
+		for (i = 0; i < _TRX_CHAN_MAX; i++) {
+			msgb_queue_flush(&l1h->dl_prims[tn]);
+			chan_state = &l1h->chan_states[tn][i];
+			if (chan_state->dl_bursts) {
+				talloc_free(chan_state->dl_bursts);
+				chan_state->dl_bursts = NULL;
+			}
+			if (chan_state->ul_bursts) {
+				talloc_free(chan_state->ul_bursts);
+				chan_state->ul_bursts = NULL;
+			}
+		}
+	}
+}
+
+
+/*
+ * data request (from upper layer)
+ */
+
+int trx_sched_ph_data_req(struct trx_l1h *l1h, struct osmo_phsap_prim *l1sap)
+{
+	uint8_t tn = l1sap->u.data.chan_nr & 7;
+
+	LOGP(DL1C, LOGL_INFO, "PH-DATA.req: chan_nr=0x%02x link_id=0x%02x "
+		"fn=%u ts=%u trx=%u\n", l1sap->u.data.chan_nr,
+		l1sap->u.data.link_id, l1sap->u.data.fn, tn, l1h->trx->nr);
+
+	if (!l1sap->oph.msg)
+		abort();
+
+	msgb_enqueue(&l1h->dl_prims[tn], l1sap->oph.msg);
+
+	return 0;
+}
+
+int trx_sched_tch_req(struct trx_l1h *l1h, struct osmo_phsap_prim *l1sap)
+{
+	uint8_t tn = l1sap->u.tch.chan_nr & 7;
+
+	LOGP(DL1C, LOGL_INFO, "TCH.req: chan_nr=0x%02x "
+		"fn=%u ts=%u trx=%u\n", l1sap->u.tch.chan_nr,
+		l1sap->u.tch.fn, tn, l1h->trx->nr);
+
+	if (!l1sap->oph.msg)
+		abort();
+
+	msgb_enqueue(&l1h->dl_prims[tn], l1sap->oph.msg);
+
+	return 0;
+}
+
+
+/* 
+ * ready-to-send indication (to upper layer)
+ */
+
+/* RTS for data frame */
+static int rts_data_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan)
+{
+	uint8_t chan_nr, link_id;
+	struct msgb *msg;
+	struct osmo_phsap_prim *l1sap;
+
+	/* get data for RTS indication */
+	chan_nr = trx_chan_desc[chan].chan_nr | tn;
+	link_id = trx_chan_desc[chan].link_id;
+
+	if (!chan_nr) {
+		LOGP(DL1C, LOGL_FATAL, "RTS func for %s with non-existing "
+			"chan_nr %d\n", trx_chan_desc[chan].name, chan_nr);
+		return -ENODEV;
+	}
+
+	LOGP(DL1C, LOGL_INFO, "PH-RTS.ind: chan=%s chan_nr=0x%02x "
+		"link_id=0x%02x fn=%u ts=%u trx=%u\n", trx_chan_desc[chan].name,
+		chan_nr, link_id, fn, tn, l1h->trx->nr);
+
+	/* generate prim */
+	msg = l1sap_msgb_alloc(200);
+	if (!msg)
+		return -ENOMEM;
+	l1sap = msgb_l1sap_prim(msg);
+	osmo_prim_init(&l1sap->oph, SAP_GSM_PH, PRIM_PH_RTS,
+	                                PRIM_OP_INDICATION, msg);
+	l1sap->u.data.chan_nr = chan_nr;
+	l1sap->u.data.link_id = link_id;
+	l1sap->u.data.fn = fn;
+
+	return l1sap_up(l1h->trx, l1sap);
+}
+
+/* RTS for traffic frame */ 
+static int rts_tch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan)
+{
+	uint8_t chan_nr, link_id;
+	struct msgb *msg;
+	struct osmo_phsap_prim *l1sap;
+
+	/* get data for RTS indication */
+	chan_nr = trx_chan_desc[chan].chan_nr | tn;
+	link_id = trx_chan_desc[chan].link_id;
+
+	if (!chan_nr) {
+		LOGP(DL1C, LOGL_FATAL, "RTS func for %s with non-existing "
+			"chan_nr %d\n", trx_chan_desc[chan].name, chan_nr);
+		return -ENODEV;
+	}
+
+	LOGP(DL1C, LOGL_INFO, "TCH.ind: chan=%s chan_nr=0x%02x "
+		"fn=%u ts=%u trx=%u\n", trx_chan_desc[chan].name,
+		chan_nr, fn, tn, l1h->trx->nr);
+
+	/* generate prim */
+	msg = l1sap_msgb_alloc(200);
+	if (!msg)
+		return -ENOMEM;
+	l1sap = msgb_l1sap_prim(msg);
+	osmo_prim_init(&l1sap->oph, SAP_GSM_PH, PRIM_TCH_RTS,
+	                                PRIM_OP_INDICATION, msg);
+	l1sap->u.tch.chan_nr = chan_nr | tn;
+	l1sap->u.tch.fn = fn;
+
+	l1sap_up(l1h->trx, l1sap);
+
+	/* generate prim */
+	msg = l1sap_msgb_alloc(200);
+	if (!msg)
+		return -ENOMEM;
+	l1sap = msgb_l1sap_prim(msg);
+	osmo_prim_init(&l1sap->oph, SAP_GSM_PH, PRIM_PH_RTS,
+	                                PRIM_OP_INDICATION, msg);
+	l1sap->u.data.chan_nr = chan_nr;
+	l1sap->u.data.chan_nr = link_id;
+	l1sap->u.data.fn = fn;
+
+	return l1sap_up(l1h->trx, l1sap);
+}
+
+
+/*
+ * TX on donlink
+ */
+
+/* an IDLE burst returns nothing. on C0 it is replaced by dummy burst */
+static const ubit_t *tx_idle_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid)
+{
+	LOGP(DL1C, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u trx=%u\n",
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr);
+
+	return NULL;
+}
+
+static const ubit_t *tx_fcch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid)
+{
+	LOGP(DL1C, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u trx=%u\n",
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr);
+
+	return fcch_burst;
+}
+
+static const ubit_t *tx_sch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid)
+{
+	static ubit_t bits[148], burst[78];
+	uint8_t sb_info[4];
+	struct	gsm_time t;
+	uint8_t t3p, bsic;
+	
+	LOGP(DL1C, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u trx=%u\n",
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr);
+
+	/* create SB info from GSM time and BSIC */
+	gsm_fn2gsmtime(&t, fn);
+	t3p = t.t3 / 10;
+	bsic = l1h->trx->bts->bsic;
+	sb_info[0] =
+		((bsic &  0x3f) << 2) |
+		((t.t1 & 0x600) >> 9);
+	sb_info[1] = 
+		((t.t1 & 0x1fe) >> 1);
+	sb_info[2] = 
+		((t.t1 & 0x001) << 7) |
+		((t.t2 &  0x1f) << 2) |
+		((t3p  &   0x6) >> 1);
+	sb_info[2] = 
+		 (t3p  &   0x1);
+
+	/* encode bursts */
+	sch_encode(burst, sb_info);
+
+	/* compose burst */
+	memset(bits, 0, 3);
+	memcpy(bits + 3, burst, 39);
+	memcpy(bits + 42, sch_train, 64);
+	memcpy(bits + 106, burst + 39, 39);
+	memset(bits + 145, 0, 3);
+
+	return bits;
+}
+
+static struct msgb *dequeue_prim(struct trx_l1h *l1h, int8_t tn,uint32_t fn,
+	enum trx_chan_type chan)
+{
+	struct msgb *found = NULL, *msg, *msg2; /* make GCC happy */
+	struct osmo_phsap_prim *l1sap = NULL; /* make GCC happy */
+	uint32_t check_fn;
+
+	/* get burst from queue */
+	llist_for_each_entry_safe(msg, msg2, &l1h->dl_prims[tn], list) {
+		l1sap = msgb_l1sap_prim(msg);
+		check_fn = ((l1sap->u.data.fn + 2715648 - fn) % 2715648);
+		if (check_fn > 20) {
+			LOGP(DL1C, LOGL_ERROR, "Prim for trx=%u ts=%u at fn=%u "
+				"is out of range. (current fn=%u)\n",
+				l1h->trx->nr, tn, l1sap->u.data.fn, fn);
+			/* unlink and free message */
+			llist_del(&msg->list);
+			msgb_free(msg);
+			continue;
+		}
+		if (check_fn > 0)
+			continue;
+
+		/* found second message, check if we have TCH+FACCH */
+		if (found) {
+			/* we found a message earlier */
+			l1sap = msgb_l1sap_prim(found);
+			/* if we have TCH+something */
+			if (l1sap->oph.primitive == PRIM_TCH) {
+				/* unlink and free message */
+				llist_del(&found->list);
+				msgb_free(found);
+				found = msg;
+			} else {
+				l1sap = msgb_l1sap_prim(msg);
+				/* if we have TCH+something */
+				if (l1sap->oph.primitive == PRIM_TCH) {
+					/* unlink and free message */
+					llist_del(&msg->list);
+					msgb_free(msg);
+				}
+			}
+			break;
+		}
+		found = msg;
+	}
+
+	if (!found) {
+		LOGP(DL1C, LOGL_NOTICE, "%s has not been served !! No prim for "
+			"trx=%u ts=%u at fn=%u to transmit.\n", 
+			trx_chan_desc[chan].name, l1h->trx->nr, tn, fn);
+		return NULL;
+	}
+
+	l1sap = msgb_l1sap_prim(found);
+
+	if ((l1sap->oph.primitive != PRIM_PH_DATA
+	  && l1sap->oph.primitive != PRIM_TCH)
+	 || l1sap->oph.operation != PRIM_OP_REQUEST) {
+		LOGP(DL1C, LOGL_ERROR, "Prim for ts=%u at fn=%u has wrong "
+			"type.\n", tn, fn);
+free_msg:
+		/* unlink and free message */
+		llist_del(&found->list);
+		msgb_free(found);
+		return NULL;
+	}
+	if ((l1sap->u.data.chan_nr ^ (trx_chan_desc[chan].chan_nr | tn))
+	 || ((l1sap->u.data.link_id ^ trx_chan_desc[chan].link_id) & 0x40)) {
+		LOGP(DL1C, LOGL_ERROR, "Prim for ts=%u at fn=%u has wrong "
+			"chan_nr=%02x link_id=%02x, expecting chan_nr=%02x "
+			"link_id=%02x.\n", tn, fn, l1sap->u.data.chan_nr,
+			l1sap->u.data.link_id, trx_chan_desc[chan].chan_nr | tn,
+			trx_chan_desc[chan].link_id);
+		goto free_msg;
+	}
+
+	return found;
+}
+
+static int compose_ph_data_ind(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t *l2, uint8_t l2_len);
+
+static const ubit_t *tx_data_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid)
+{
+	struct msgb *msg = NULL; /* make GCC happy */
+	ubit_t *burst, **bursts_p = &l1h->chan_states[tn][chan].dl_bursts;
+	static ubit_t bits[148];
+
+	/* send burst, if we already got a frame */
+	if (bid > 0) {
+		if (!*bursts_p)
+			return NULL;
+		goto send_burst;
+	}
+
+	/* get burst from queue */
+	msg = dequeue_prim(l1h, tn, fn, chan);
+	if (msg)
+		goto got_msg;
+
+no_msg:
+	/* free burst memory */
+	if (*bursts_p) {
+		talloc_free(*bursts_p);
+		*bursts_p = NULL;
+	}
+	return NULL;
+
+got_msg:
+	/* check validity of message */
+	if (msgb_l2len(msg) != 23) {
+		LOGP(DL1C, LOGL_FATAL, "Prim not 23 bytes, please FIX! "
+			"(len=%d)\n", msgb_l2len(msg));
+		/* unlink and free message */
+		llist_del(&msg->list);
+		msgb_free(msg);
+		goto no_msg;
+	}
+
+	/* handle loss detection of sacch */
+	if (L1SAP_IS_LINK_SACCH(trx_chan_desc[chan].link_id)) {
+		/* count and send BFI */
+		if (++(l1h->chan_states[tn][chan].sacch_lost) > 1)
+			compose_ph_data_ind(l1h, tn, 0, chan, NULL, 0);
+	}
+
+	/* alloc burst memory, if not already */
+	if (!*bursts_p) {
+		*bursts_p = talloc_zero_size(tall_bts_ctx, 464);
+		if (!*bursts_p)
+			return NULL;
+	}
+
+	/* encode bursts */
+	xcch_encode(*bursts_p, msg->l2h);
+
+	/* unlink and free message */
+	llist_del(&msg->list);
+	msgb_free(msg);
+
+send_burst:
+	/* compose burst */
+	burst = *bursts_p + bid * 116;
+	memset(bits, 0, 3);
+	memcpy(bits + 3, burst, 58);
+	memcpy(bits + 61, tsc[l1h->config.tsc], 26);
+	memcpy(bits + 87, burst + 58, 58);
+	memset(bits + 145, 0, 3);
+
+	LOGP(DL1C, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u trx=%u burst=%u\n",
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr, bid);
+
+	return bits;
+}
+
+static const ubit_t *tx_pdtch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid)
+{
+	struct msgb *msg = NULL; /* make GCC happy */
+	ubit_t *burst, **bursts_p = &l1h->chan_states[tn][chan].dl_bursts;
+	static ubit_t bits[148];
+	int rc;
+
+	/* send burst, if we already got a frame */
+	if (bid > 0) {
+		if (!*bursts_p)
+			return NULL;
+		goto send_burst;
+	}
+
+	/* get burst from queue */
+	msg = dequeue_prim(l1h, tn, fn, chan);
+	if (msg)
+		goto got_msg;
+
+no_msg:
+	/* free burst memory */
+	if (*bursts_p) {
+		talloc_free(*bursts_p);
+		*bursts_p = NULL;
+	}
+	return NULL;
+
+got_msg:
+	/* alloc burst memory, if not already */
+	if (!*bursts_p) {
+		*bursts_p = talloc_zero_size(tall_bts_ctx, 464);
+		if (!*bursts_p)
+			return NULL;
+	}
+
+	/* encode bursts */
+	rc = pdtch_encode(*bursts_p, msg->l2h, msg->tail - msg->l2h);
+
+	/* check validity of message */
+	if (rc) {
+		LOGP(DL1C, LOGL_FATAL, "Prim invalid length, please FIX! "
+			"(len=%d)\n", rc);
+		/* unlink and free message */
+		llist_del(&msg->list);
+		msgb_free(msg);
+		goto no_msg;
+	}
+
+	/* unlink and free message */
+	llist_del(&msg->list);
+	msgb_free(msg);
+
+send_burst:
+	/* compose burst */
+	burst = *bursts_p + bid * 116;
+	memset(bits, 0, 3);
+	memcpy(bits + 3, burst, 58);
+	memcpy(bits + 61, tsc[l1h->config.tsc], 26);
+	memcpy(bits + 87, burst + 58, 58);
+	memset(bits + 145, 0, 3);
+
+	LOGP(DL1C, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u trx=%u burst=%u\n",
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr, bid);
+
+	return bits;
+}
+
+static const ubit_t *tx_tchf_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid)
+{
+	struct msgb *msg = NULL; /* make GCC happy */
+	ubit_t *burst, **bursts_p = &l1h->chan_states[tn][chan].dl_bursts;
+	static ubit_t bits[148];
+	struct osmo_phsap_prim *l1sap;
+
+	/* send burst, if we already got a frame */
+	if (bid > 0) {
+		if (!*bursts_p)
+			return NULL;
+		goto send_burst;
+	}
+
+	/* get burst from queue */
+	msg = dequeue_prim(l1h, tn, fn, chan);
+	if (msg)
+		goto got_msg;
+
+no_msg:
+	/* free burst memory */
+	if (*bursts_p) {
+		talloc_free(*bursts_p);
+		*bursts_p = NULL;
+	}
+	return NULL;
+
+got_msg:
+	l1sap = msgb_l1sap_prim(msg);
+	if (l1sap->oph.primitive == PRIM_TCH) {
+		/* check validity of message */
+		if (msgb_l2len(msg) != 33) {
+			LOGP(DL1C, LOGL_FATAL, "Prim not 33 bytes, please FIX! "
+				"(len=%d)\n", msgb_l2len(msg));
+			/* unlink and free message */
+			llist_del(&msg->list);
+			msgb_free(msg);
+			goto no_msg;
+		}
+	} else {
+		/* check validity of message */
+		if (msgb_l2len(msg) != 23) {
+			LOGP(DL1C, LOGL_FATAL, "Prim not 23 bytes, please FIX! "
+				"(len=%d)\n", msgb_l2len(msg));
+			/* unlink and free message */
+			llist_del(&msg->list);
+			msgb_free(msg);
+			goto no_msg;
+		}
+	}
+
+	/* alloc burst memory, if not already,
+	 * otherwise shift buffer by 4 bursts for interleaving */
+	if (!*bursts_p) {
+		*bursts_p = talloc_zero_size(tall_bts_ctx, 928);
+		if (!*bursts_p)
+			return NULL;
+	} else
+		memcpy(*bursts_p, *bursts_p + 464, 464);
+
+	/* encode bursts */
+	tch_fr_encode(*bursts_p, msg->l2h, msgb_l2len(msg));
+
+	/* unlink and free message */
+	llist_del(&msg->list);
+	msgb_free(msg);
+
+send_burst:
+	/* compose burst */
+	burst = *bursts_p + bid * 116;
+	memset(bits, 0, 3);
+	memcpy(bits + 3, burst, 58);
+	memcpy(bits + 61, tsc[l1h->config.tsc], 26);
+	memcpy(bits + 87, burst + 58, 58);
+	memset(bits + 145, 0, 3);
+
+	LOGP(DL1C, LOGL_DEBUG, "Transmitting %s fn=%u ts=%u trx=%u burst=%u\n",
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr, bid);
+
+	return bits;
+}
+
+static const ubit_t *tx_tchh_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid)
+{
+	// FIXME
+	return NULL;
+}
+
+
+
+/*
+ * RX on uplink (indication to upper layer)
+ */
+
+static int rx_rach_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa)
+{
+	struct osmo_phsap_prim l1sap;
+	uint8_t ra;
+	int rc;
+
+	LOGP(DL1C, LOGL_DEBUG, "Received %s fn=%u\n", 
+		trx_chan_desc[chan].name, fn);
+
+	/* decode */
+	rc = rach_decode(&ra, bits + 8 + 41, l1h->trx->bts->bsic);
+	if (rc) {
+		LOGP(DL1C, LOGL_NOTICE, "Received bad rach frame at fn=%u "
+			"ra=%u\n", fn, ra);
+		return 0;
+	}
+
+	/* compose primitive */
+	/* generate prim */
+	memset(&l1sap, 0, sizeof(l1sap));
+	osmo_prim_init(&l1sap.oph, SAP_GSM_PH, PRIM_PH_RACH, PRIM_OP_INDICATION,
+		NULL);
+	l1sap.u.rach_ind.ra = ra;
+	l1sap.u.rach_ind.acc_delay = 0; //FIXME: TOA
+	l1sap.u.rach_ind.fn = fn;
+
+	/* forward primitive */
+	l1sap_up(l1h->trx, &l1sap);
+
+	return 0;
+}
+
+static int compose_ph_data_ind(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t *l2, uint8_t l2_len)
+{
+	struct msgb *msg;
+	struct osmo_phsap_prim *l1sap;
+
+	/* compose primitive */
+	msg = l1sap_msgb_alloc(l2_len);
+	l1sap = msgb_l1sap_prim(msg);
+	osmo_prim_init(&l1sap->oph, SAP_GSM_PH, PRIM_PH_DATA,
+		PRIM_OP_INDICATION, msg);
+	l1sap->u.data.chan_nr = trx_chan_desc[chan].chan_nr | tn;
+	l1sap->u.data.link_id = trx_chan_desc[chan].link_id;
+	l1sap->u.data.fn = fn;
+	msg->l2h = msgb_put(msg, l2_len);
+	if (l2_len)
+		memcpy(msg->l2h, l2, l2_len);
+
+	if (L1SAP_IS_LINK_SACCH(trx_chan_desc[chan].link_id))
+		l1h->chan_states[tn][chan].sacch_lost = 0;
+
+	/* forward primitive */
+	l1sap_up(l1h->trx, l1sap);
+
+	return 0;
+}
+
+static int rx_data_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa)
+{
+	struct trx_chan_state *chan_state = &l1h->chan_states[tn][chan];
+	sbit_t *burst, **bursts_p = &chan_state->ul_bursts;
+	uint32_t *first_fn = &chan_state->ul_first_fn;
+	uint8_t *mask = &chan_state->ul_mask;
+	uint8_t l2[23], l2_len;
+	int rc;
+
+	LOGP(DL1C, LOGL_DEBUG, "Data received %s fn=%u ts=%u trx=%u bid=%u\n", 
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr, bid);
+
+	/* alloc burst memory, if not already */
+	if (!*bursts_p) {
+		*bursts_p = talloc_zero_size(tall_bts_ctx, 464);
+		if (!*bursts_p)
+			return -ENOMEM;
+	}
+
+	/* update mask */
+	*mask |= (1 << bid);
+
+	/* store frame number of first burst */
+	if (bid == 0)
+		*first_fn = fn;
+
+	/* copy burst to buffer of 4 bursts */
+	burst = *bursts_p + bid * 116;
+	memcpy(burst, bits + 3, 58);
+	memcpy(burst + 58, bits + 87, 58);
+
+	// FIXME: decrypt burst
+
+	/* wait until complete set of bursts */
+	if ((*mask & 0xf) != 0xf)
+		return 0;
+	*mask = 0x0;
+
+	/* decode */
+	rc = xcch_decode(l2, *bursts_p);
+	if (rc) {
+		LOGP(DL1C, LOGL_NOTICE, "Received bad data frame at fn=%u for "
+			"%s\n", *first_fn, trx_chan_desc[chan].name);
+		l2_len = 0;
+	} else
+		l2_len = 23;
+
+	return compose_ph_data_ind(l1h, tn, *first_fn, chan, l2, l2_len);
+}
+
+static int rx_pdtch_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa)
+{
+	struct trx_chan_state *chan_state = &l1h->chan_states[tn][chan];
+	sbit_t *burst, **bursts_p = &chan_state->ul_bursts;
+	uint32_t *first_fn = &chan_state->ul_first_fn;
+	uint8_t *mask = &chan_state->ul_mask;
+	uint8_t l2[54+1];
+	int rc;
+
+	LOGP(DL1C, LOGL_DEBUG, "PDTCH received %s fn=%u ts=%u trx=%u bid=%u\n", 
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr, bid);
+
+	/* alloc burst memory, if not already */
+	if (!*bursts_p) {
+		*bursts_p = talloc_zero_size(tall_bts_ctx, 464);
+		if (!*bursts_p)
+			return -ENOMEM;
+	}
+
+	/* update mask */
+	*mask |= (1 << bid);
+
+	/* store frame number of first burst */
+	if (bid == 0)
+		*first_fn = fn;
+
+	/* copy burst to buffer of 4 bursts */
+	burst = *bursts_p + bid * 116;
+	memcpy(burst, bits + 3, 58);
+	memcpy(burst + 58, bits + 87, 58);
+
+	// FIXME: decrypt burst
+
+	/* wait until complete set of bursts */
+	if ((*mask & 0xf) != 0xf)
+		return 0;
+	*mask = 0x0;
+
+	/* decode */
+	rc = pdch_decode(l2 + 1, *bursts_p, NULL);
+	if (rc <= 0) {
+		LOGP(DL1C, LOGL_NOTICE, "Received bad PDTCH frame at fn=%u for "
+			"%s\n", *first_fn, trx_chan_desc[chan].name);
+		l2[0] = 0; /* bad frame */
+		rc = 0;
+	} else
+		l2[0] = 7; /* valid frame */
+
+	return compose_ph_data_ind(l1h, tn, *first_fn, chan, l2, rc + 1);
+}
+
+static int compose_tch_ind(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t *tch, uint8_t tch_len)
+{
+	struct msgb *msg;
+	struct osmo_phsap_prim *l1sap;
+
+	/* compose primitive */
+	msg = l1sap_msgb_alloc(tch_len);
+	l1sap = msgb_l1sap_prim(msg);
+	osmo_prim_init(&l1sap->oph, SAP_GSM_PH, PRIM_TCH,
+		PRIM_OP_INDICATION, msg);
+	l1sap->u.tch.chan_nr = trx_chan_desc[chan].chan_nr | tn;
+	l1sap->u.tch.fn = fn;
+	msg->l2h = msgb_put(msg, tch_len);
+	if (tch_len)
+		memcpy(msg->l2h, tch, tch_len);
+
+	/* forward primitive */
+	l1sap_up(l1h->trx, l1sap);
+
+	return 0;
+}
+
+static int rx_tchf_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa)
+{
+	struct trx_chan_state *chan_state = &l1h->chan_states[tn][chan];
+	sbit_t *burst, **bursts_p = &chan_state->ul_bursts;
+	uint32_t *first_fn = &chan_state->ul_first_fn;
+	uint8_t *mask = &chan_state->ul_mask;
+	uint8_t tch_data[33];
+	int rc;
+
+	LOGP(DL1C, LOGL_DEBUG, "TCH/F received %s fn=%u ts=%u trx=%u bid=%u\n", 
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr, bid);
+
+	/* alloc burst memory, if not already */
+	if (!*bursts_p) {
+		*bursts_p = talloc_zero_size(tall_bts_ctx, 928);
+		if (!*bursts_p)
+			return -ENOMEM;
+	}
+
+	/* update mask */
+	*mask |= (1 << bid);
+
+	/* store frame number of first burst */
+	if (bid == 0)
+		*first_fn = fn;
+
+	/* copy burst to end of buffer of 8 bursts */
+	burst = *bursts_p + bid * 116 + 464;
+	memcpy(burst, bits + 3, 58);
+	memcpy(burst + 58, bits + 87, 58);
+
+	// FIXME: decrypt burst
+
+	/* wait until complete set of bursts */
+	if (*mask != 0xff)
+		return 0;
+	*mask = 0xf0;
+
+	/* decode
+	 * also shift buffer by 4 bursts for interleaving */
+	rc = tch_fr_decode(tch_data, *bursts_p);
+	memcpy(*bursts_p, *bursts_p + 464, 464);
+	if (rc < 0) {
+		LOGP(DL1C, LOGL_NOTICE, "Received bad tch frame at fn=%u "
+			"for %s\n", *first_fn, trx_chan_desc[chan].name);
+		rc = 0;
+	}
+
+	/* FACCH */
+	if (rc == 23)
+		return compose_ph_data_ind(l1h, tn, *first_fn, chan, tch_data,
+			23);
+
+	/* TCH or BFI */
+	return compose_tch_ind(l1h, tn, *first_fn, chan, tch_data, rc);
+}
+
+static int rx_tchh_fn(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	enum trx_chan_type chan, uint8_t bid, sbit_t *bits, int16_t toa)
+{
+	LOGP(DL1C, LOGL_DEBUG, "TCH/H Received %s fn=%u ts=%u trx=%u bid=%u\n", 
+		trx_chan_desc[chan].name, fn, tn, l1h->trx->nr, bid);
+
+	// FIXME
+	return 0;
+}
+
+
+/*
+ * multiframe structure
+ */
+
+/* frame structures */
+struct trx_sched_frame {
+	enum trx_chan_type		dl_chan;
+	uint8_t				dl_bid;
+	enum trx_chan_type		ul_chan;
+	uint8_t				ul_bid;
+};
+
+static struct trx_sched_frame frame_bcch[51] = {
+/*	dl_chan		dl_bid	ul_chan		ul_bid */
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_BCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_BCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_BCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_BCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      {	TRXC_IDLE,	0,	TRXC_RACH,	0 },
+};
+
+static struct trx_sched_frame frame_bcch_sdcch4[102] = {
+/*	dl_chan		dl_bid	ul_chan		ul_bid */
+      {	TRXC_FCCH,	0,	TRXC_SDCCH4_3,	0 },
+      {	TRXC_SCH,	0,	TRXC_SDCCH4_3,	1 },
+      { TRXC_BCCH,	0,	TRXC_SDCCH4_3,	2 },
+      { TRXC_BCCH,	1,	TRXC_SDCCH4_3,	3 },
+      { TRXC_BCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_BCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_SACCH4_2,	0 },
+      { TRXC_CCCH,	1,	TRXC_SACCH4_2,	1 },
+      { TRXC_CCCH,	2,	TRXC_SACCH4_2,	2 },
+      { TRXC_CCCH,	3,	TRXC_SACCH4_2,	3 },
+      {	TRXC_FCCH,	0,	TRXC_SACCH4_3,	0 },
+      {	TRXC_SCH,	0,	TRXC_SACCH4_3,	1 },
+      { TRXC_CCCH,	0,	TRXC_SACCH4_3,	2 },
+      { TRXC_CCCH,	1,	TRXC_SACCH4_3,	3 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	1,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	2,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	3,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	1,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	2,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	1,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	2,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	3,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_3,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_3,	1,	TRXC_SDCCH4_0,	0 },
+      { TRXC_SDCCH4_3,	2,	TRXC_SDCCH4_0,	1 },
+      { TRXC_SDCCH4_3,	3,	TRXC_SDCCH4_0,	2 },
+      {	TRXC_FCCH,	0,	TRXC_SDCCH4_0,	3 },
+      {	TRXC_SCH,	0,	TRXC_SDCCH4_1,	0 },
+      { TRXC_SACCH4_0,	0,	TRXC_SDCCH4_1,	1 },
+      { TRXC_SACCH4_0,	1,	TRXC_SDCCH4_1,	2 },
+      { TRXC_SACCH4_0,	2,	TRXC_SDCCH4_1,	3 },
+      { TRXC_SACCH4_0,	3,	TRXC_RACH,	0 },
+      { TRXC_SACCH4_1,	0,	TRXC_RACH,	0 },
+      { TRXC_SACCH4_1,	1,	TRXC_SDCCH4_2,	0 },
+      { TRXC_SACCH4_1,	2,	TRXC_SDCCH4_2,	1 },
+      { TRXC_SACCH4_1,	3,	TRXC_SDCCH4_2,	2 },
+      {	TRXC_IDLE,	0,	TRXC_SDCCH4_2,	3 },
+      {	TRXC_FCCH,	0,	TRXC_SDCCH4_3,	0 },
+      {	TRXC_SCH,	0,	TRXC_SDCCH4_3,	1 },
+      { TRXC_BCCH,	0,	TRXC_SDCCH4_3,	2 },
+      { TRXC_BCCH,	1,	TRXC_SDCCH4_3,	3 },
+      { TRXC_BCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_BCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_SACCH4_0,	0 },
+      { TRXC_CCCH,	1,	TRXC_SACCH4_0,	1 },
+      { TRXC_CCCH,	2,	TRXC_SACCH4_0,	2 },
+      { TRXC_CCCH,	3,	TRXC_SACCH4_0,	3 },
+      {	TRXC_FCCH,	0,	TRXC_SACCH4_1,	0 },
+      {	TRXC_SCH,	0,	TRXC_SACCH4_1,	1 },
+      { TRXC_CCCH,	0,	TRXC_SACCH4_1,	2 },
+      { TRXC_CCCH,	1,	TRXC_SACCH4_1,	3 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	0,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	1,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	2,	TRXC_RACH,	0 },
+      { TRXC_CCCH,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	1,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	2,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_0,	3,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	1,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	2,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_1,	3,	TRXC_RACH,	0 },
+      {	TRXC_FCCH,	0,	TRXC_RACH,	0 },
+      {	TRXC_SCH,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	1,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	2,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_2,	3,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_3,	0,	TRXC_RACH,	0 },
+      { TRXC_SDCCH4_3,	1,	TRXC_SDCCH4_0,	0 },
+      { TRXC_SDCCH4_3,	2,	TRXC_SDCCH4_0,	1 },
+      { TRXC_SDCCH4_3,	3,	TRXC_SDCCH4_0,	2 },
+      {	TRXC_FCCH,	0,	TRXC_SDCCH4_0,	3 },
+      {	TRXC_SCH,	0,	TRXC_SDCCH4_1,	0 },
+      { TRXC_SACCH4_2,	0,	TRXC_SDCCH4_1,	1 },
+      { TRXC_SACCH4_2,	1,	TRXC_SDCCH4_1,	2 },
+      { TRXC_SACCH4_2,	2,	TRXC_SDCCH4_1,	3 },
+      { TRXC_SACCH4_2,	3,	TRXC_RACH,	0 },
+      { TRXC_SACCH4_3,	0,	TRXC_RACH,	0 },
+      { TRXC_SACCH4_3,	1,	TRXC_SDCCH4_2,	0 },
+      { TRXC_SACCH4_3,	2,	TRXC_SDCCH4_2,	1 },
+      { TRXC_SACCH4_3,	3,	TRXC_SDCCH4_2,	2 },
+      {	TRXC_IDLE,	0,	TRXC_SDCCH4_2,	3 },
+};
+
+static struct trx_sched_frame frame_sdcch8[102] = {
+/*	dl_chan		dl_bid	ul_chan		ul_bid */
+      { TRXC_SDCCH8_0,	0,	TRXC_SACCH8_5,	0 },
+      { TRXC_SDCCH8_0,	1,	TRXC_SACCH8_5,	1 },
+      { TRXC_SDCCH8_0,	2,	TRXC_SACCH8_5,	2 },
+      { TRXC_SDCCH8_0,	3,	TRXC_SACCH8_5,	3 },
+      { TRXC_SDCCH8_1,	0,	TRXC_SACCH8_6,	0 },
+      { TRXC_SDCCH8_1,	1,	TRXC_SACCH8_6,	1 },
+      { TRXC_SDCCH8_1,	2,	TRXC_SACCH8_6,	2 },
+      { TRXC_SDCCH8_1,	3,	TRXC_SACCH8_6,	3 },
+      { TRXC_SDCCH8_2,	0,	TRXC_SACCH8_7,	0 },
+      { TRXC_SDCCH8_2,	1,	TRXC_SACCH8_7,	1 },
+      { TRXC_SDCCH8_2,	2,	TRXC_SACCH8_7,	2 },
+      { TRXC_SDCCH8_2,	3,	TRXC_SACCH8_7,	3 },
+      { TRXC_SDCCH8_3,	0,	TRXC_IDLE,	0 },
+      { TRXC_SDCCH8_3,	1,	TRXC_IDLE,	0 },
+      { TRXC_SDCCH8_3,	2,	TRXC_IDLE,	0 },
+      { TRXC_SDCCH8_3,	3,	TRXC_SDCCH8_0,	0 },
+      { TRXC_SDCCH8_4,	0,	TRXC_SDCCH8_0,	1 },
+      { TRXC_SDCCH8_4,	1,	TRXC_SDCCH8_0,	2 },
+      { TRXC_SDCCH8_4,	2,	TRXC_SDCCH8_0,	3 },
+      { TRXC_SDCCH8_4,	3,	TRXC_SDCCH8_1,	0 },
+      { TRXC_SDCCH8_5,	0,	TRXC_SDCCH8_1,	1 },
+      { TRXC_SDCCH8_5,	1,	TRXC_SDCCH8_1,	2 },
+      { TRXC_SDCCH8_5,	2,	TRXC_SDCCH8_1,	3 },
+      { TRXC_SDCCH8_5,	3,	TRXC_SDCCH8_2,	0 },
+      { TRXC_SDCCH8_6,	0,	TRXC_SDCCH8_2,	1 },
+      { TRXC_SDCCH8_6,	1,	TRXC_SDCCH8_2,	2 },
+      { TRXC_SDCCH8_6,	2,	TRXC_SDCCH8_2,	3 },
+      { TRXC_SDCCH8_6,	3,	TRXC_SDCCH8_3,	0 },
+      { TRXC_SDCCH8_7,	0,	TRXC_SDCCH8_3,	1 },
+      { TRXC_SDCCH8_7,	1,	TRXC_SDCCH8_3,	2 },
+      { TRXC_SDCCH8_7,	2,	TRXC_SDCCH8_3,	3 },
+      { TRXC_SDCCH8_7,	3,	TRXC_SDCCH8_4,	0 },
+      { TRXC_SACCH8_0,	0,	TRXC_SDCCH8_4,	1 },
+      { TRXC_SACCH8_0,	1,	TRXC_SDCCH8_4,	2 },
+      { TRXC_SACCH8_0,	2,	TRXC_SDCCH8_4,	3 },
+      { TRXC_SACCH8_0,	3,	TRXC_SDCCH8_5,	0 },
+      { TRXC_SACCH8_1,	0,	TRXC_SDCCH8_5,	1 },
+      { TRXC_SACCH8_1,	1,	TRXC_SDCCH8_5,	2 },
+      { TRXC_SACCH8_1,	2,	TRXC_SDCCH8_5,	3 },
+      { TRXC_SACCH8_1,	3,	TRXC_SDCCH8_6,	0 },
+      { TRXC_SACCH8_2,	0,	TRXC_SDCCH8_6,	1 },
+      { TRXC_SACCH8_2,	1,	TRXC_SDCCH8_6,	2 },
+      { TRXC_SACCH8_2,	2,	TRXC_SDCCH8_6,	3 },
+      { TRXC_SACCH8_2,	3,	TRXC_SDCCH8_7,	0 },
+      { TRXC_SACCH8_3,	0,	TRXC_SDCCH8_7,	1 },
+      { TRXC_SACCH8_3,	1,	TRXC_SDCCH8_7,	2 },
+      { TRXC_SACCH8_3,	2,	TRXC_SDCCH8_7,	3 },
+      { TRXC_SACCH8_3,	3,	TRXC_SACCH8_0,	0 },
+      { TRXC_IDLE,	0,	TRXC_SACCH8_0,	1 },
+      { TRXC_IDLE,	0,	TRXC_SACCH8_0,	2 },
+      { TRXC_IDLE,	0,	TRXC_SACCH8_0,	3 },
+      { TRXC_SDCCH8_0,	0,	TRXC_SACCH8_1,	0 },
+      { TRXC_SDCCH8_0,	1,	TRXC_SACCH8_1,	1 },
+      { TRXC_SDCCH8_0,	2,	TRXC_SACCH8_1,	2 },
+      { TRXC_SDCCH8_0,	3,	TRXC_SACCH8_1,	3 },
+      { TRXC_SDCCH8_1,	0,	TRXC_SACCH8_2,	0 },
+      { TRXC_SDCCH8_1,	1,	TRXC_SACCH8_2,	1 },
+      { TRXC_SDCCH8_1,	2,	TRXC_SACCH8_2,	2 },
+      { TRXC_SDCCH8_1,	3,	TRXC_SACCH8_2,	3 },
+      { TRXC_SDCCH8_2,	0,	TRXC_SACCH8_3,	0 },
+      { TRXC_SDCCH8_2,	1,	TRXC_SACCH8_3,	1 },
+      { TRXC_SDCCH8_2,	2,	TRXC_SACCH8_3,	2 },
+      { TRXC_SDCCH8_2,	3,	TRXC_SACCH8_3,	3 },
+      { TRXC_SDCCH8_3,	0,	TRXC_IDLE,	0 },
+      { TRXC_SDCCH8_3,	1,	TRXC_IDLE,	0 },
+      { TRXC_SDCCH8_3,	2,	TRXC_IDLE,	0 },
+      { TRXC_SDCCH8_3,	3,	TRXC_SDCCH8_0,	0 },
+      { TRXC_SDCCH8_4,	0,	TRXC_SDCCH8_0,	1 },
+      { TRXC_SDCCH8_4,	1,	TRXC_SDCCH8_0,	2 },
+      { TRXC_SDCCH8_4,	2,	TRXC_SDCCH8_0,	3 },
+      { TRXC_SDCCH8_4,	3,	TRXC_SDCCH8_1,	0 },
+      { TRXC_SDCCH8_5,	0,	TRXC_SDCCH8_1,	1 },
+      { TRXC_SDCCH8_5,	1,	TRXC_SDCCH8_1,	2 },
+      { TRXC_SDCCH8_5,	2,	TRXC_SDCCH8_1,	3 },
+      { TRXC_SDCCH8_5,	3,	TRXC_SDCCH8_2,	0 },
+      { TRXC_SDCCH8_6,	0,	TRXC_SDCCH8_2,	1 },
+      { TRXC_SDCCH8_6,	1,	TRXC_SDCCH8_2,	2 },
+      { TRXC_SDCCH8_6,	2,	TRXC_SDCCH8_2,	3 },
+      { TRXC_SDCCH8_6,	3,	TRXC_SDCCH8_3,	0 },
+      { TRXC_SDCCH8_7,	0,	TRXC_SDCCH8_3,	1 },
+      { TRXC_SDCCH8_7,	1,	TRXC_SDCCH8_3,	2 },
+      { TRXC_SDCCH8_7,	2,	TRXC_SDCCH8_3,	3 },
+      { TRXC_SDCCH8_7,	3,	TRXC_SDCCH8_4,	0 },
+      { TRXC_SACCH8_4,	0,	TRXC_SDCCH8_4,	1 },
+      { TRXC_SACCH8_4,	1,	TRXC_SDCCH8_4,	2 },
+      { TRXC_SACCH8_4,	2,	TRXC_SDCCH8_4,	3 },
+      { TRXC_SACCH8_4,	3,	TRXC_SDCCH8_5,	0 },
+      { TRXC_SACCH8_5,	0,	TRXC_SDCCH8_5,	1 },
+      { TRXC_SACCH8_5,	1,	TRXC_SDCCH8_5,	2 },
+      { TRXC_SACCH8_5,	2,	TRXC_SDCCH8_5,	3 },
+      { TRXC_SACCH8_5,	3,	TRXC_SDCCH8_6,	0 },
+      { TRXC_SACCH8_6,	0,	TRXC_SDCCH8_6,	1 },
+      { TRXC_SACCH8_6,	1,	TRXC_SDCCH8_6,	2 },
+      { TRXC_SACCH8_6,	2,	TRXC_SDCCH8_6,	3 },
+      { TRXC_SACCH8_6,	3,	TRXC_SDCCH8_7,	0 },
+      { TRXC_SACCH8_7,	0,	TRXC_SDCCH8_7,	1 },
+      { TRXC_SACCH8_7,	1,	TRXC_SDCCH8_7,	2 },
+      { TRXC_SACCH8_7,	2,	TRXC_SDCCH8_7,	3 },
+      { TRXC_SACCH8_7,	3,	TRXC_SACCH8_4,	0 },
+      { TRXC_IDLE,	0,	TRXC_SACCH8_4,	1 },
+      { TRXC_IDLE,	0,	TRXC_SACCH8_4,	2 },
+      { TRXC_IDLE,	0,	TRXC_SACCH8_4,	3 },
+};
+
+static struct trx_sched_frame frame_tchf[104] = {
+/*	dl_chan		dl_bid	ul_chan		ul_bid */
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_SACCHTF,	0,	TRXC_SACCHTF,	0 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_SACCHTF,	1,	TRXC_SACCHTF,	1 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_SACCHTF,	2,	TRXC_SACCHTF,	2 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_SACCHTF,	3,	TRXC_SACCHTF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_TCHF,	0,	TRXC_TCHF,	0 },
+      { TRXC_TCHF,	1,	TRXC_TCHF,	1 },
+      { TRXC_TCHF,	2,	TRXC_TCHF,	2 },
+      { TRXC_TCHF,	3,	TRXC_TCHF,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+};
+
+static struct trx_sched_frame frame_tchh[104] = {
+/*	dl_chan		dl_bid	ul_chan		ul_bid */
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_0,	0,	TRXC_SACCHTH_0,	0 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_1,	0,	TRXC_SACCHTH_1,	0 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_0,	1,	TRXC_SACCHTH_0,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_1,	1,	TRXC_SACCHTH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_0,	2,	TRXC_SACCHTH_0,	2 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_1,	2,	TRXC_SACCHTH_1,	2 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_0,	3,	TRXC_SACCHTH_0,	3 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_TCHH_0,	0,	TRXC_TCHH_0,	0 },
+      { TRXC_TCHH_1,	0,	TRXC_TCHH_1,	0 },
+      { TRXC_TCHH_0,	1,	TRXC_TCHH_0,	1 },
+      { TRXC_TCHH_1,	1,	TRXC_TCHH_1,	1 },
+      { TRXC_SACCHTH_1,	3,	TRXC_SACCHTH_1,	3 },
+};
+
+static struct trx_sched_frame frame_pdch[104] = {
+/*	dl_chan		dl_bid	ul_chan		ul_bid */
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PTCCH,	0,	TRXC_PTCCH,	0 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PTCCH,	1,	TRXC_PTCCH,	1 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PTCCH,	2,	TRXC_PTCCH,	2 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PTCCH,	3,	TRXC_PTCCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_PDTCH,	0,	TRXC_PDTCH,	0 },
+      { TRXC_PDTCH,	1,	TRXC_PDTCH,	1 },
+      { TRXC_PDTCH,	2,	TRXC_PDTCH,	2 },
+      { TRXC_PDTCH,	3,	TRXC_PDTCH,	3 },
+      { TRXC_IDLE,	0,	TRXC_IDLE,	0 },
+};
+
+/* multiframe structure */
+struct trx_sched_multiframe {
+	enum gsm_phys_chan_config	pchan;
+	uint8_t				period;
+	struct trx_sched_frame		*frames;
+	const char 			*name;
+};
+
+static struct trx_sched_multiframe trx_sched_multiframes[] = {
+	{ GSM_PCHAN_NONE,		0,	NULL,			"NONE"},
+	{ GSM_PCHAN_CCCH,		51,	frame_bcch,		"BCCH+CCCH" },
+	{ GSM_PCHAN_CCCH_SDCCH4,	102,	frame_bcch_sdcch4,	"BCCH+CCCH+SDCCH/4+SACCH/4" },
+	{ GSM_PCHAN_SDCCH8_SACCH8C,	102,	frame_sdcch8,		"SDCCH/8+SACCH/8" },
+	{ GSM_PCHAN_TCH_F,		104,	frame_tchf,		"TCH/F+SACCH" },
+	{ GSM_PCHAN_TCH_H,		104,	frame_tchh,		"TCH/H+SACCH" },
+	{ GSM_PCHAN_PDCH,		104,	frame_pdch,		"PDCH" },
+};
+
+
+/*
+ * scheduler functions
+ */
+
+/* set multiframe scheduler to given pchan */
+int trx_sched_set_pchan(struct trx_l1h *l1h, uint8_t tn,
+	enum gsm_phys_chan_config pchan)
+{
+	int i;
+
+	/* ignore disabled slots */
+	if (!(l1h->config.slotmask & (1 << tn)))
+		return -ENOTSUP;
+
+	for (i = 0; ARRAY_SIZE(trx_sched_multiframes); i++) {
+		if (trx_sched_multiframes[i].pchan == pchan) {
+			l1h->mf_index[tn] = i;
+			LOGP(DL1C, LOGL_NOTICE, "Configuring multiframe with "
+				"%s trx=%d ts=%d\n",
+				trx_sched_multiframes[i].name,
+				l1h->trx->nr, tn);
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+/* setting all logical channels given attributes to active/inactive */
+int trx_sched_set_lchan(struct trx_l1h *l1h, uint8_t chan_nr, uint8_t link_id,
+	int downlink, int active)
+{
+	uint8_t tn = L1SAP_CHAN2TS(chan_nr);
+	int i;
+	int rc = -EINVAL;
+
+	/* look for all matching chan_nr/link_id */
+	for (i = 0; i < _TRX_CHAN_MAX; i++) {
+		if (trx_chan_desc[i].chan_nr == (chan_nr & 0xf8)
+		 && trx_chan_desc[i].link_id == link_id) {
+			LOGP(DL1C, LOGL_NOTICE, "%s %s %s on trx=%d ts=%d\n",
+				(active) ? "Activating" : "Deactivating",
+				(downlink) ? "downlink" : "uplink",
+				trx_chan_desc[i].name, l1h->trx->nr, tn);
+		 	if (downlink) {
+				l1h->chan_states[tn][i].dl_active = active;
+				l1h->chan_states[tn][i].dl_active = active;
+			} else {
+				l1h->chan_states[tn][i].ul_active = active;
+				l1h->chan_states[tn][i].ul_active = active;
+			}
+			l1h->chan_states[tn][i].sacch_lost = 0;
+			rc = 0;
+		}
+	}
+
+	return rc;
+}
+
+/* process ready-to-send */
+static int trx_sched_rts(struct trx_l1h *l1h, uint8_t tn, uint32_t fn)
+{
+	struct trx_sched_frame *frame;
+	uint8_t offset, period, bid;
+	trx_sched_rts_func *func;
+	enum trx_chan_type chan;
+
+	/* no multiframe set */
+	if (!l1h->mf_index[tn])
+		return 0;
+
+	/* get frame from multiframe */
+	period = trx_sched_multiframes[l1h->mf_index[tn]].period;
+	offset = fn % period;
+	frame = trx_sched_multiframes[l1h->mf_index[tn]].frames + offset;
+
+	chan = frame->dl_chan;
+	bid = frame->dl_bid;
+	func = trx_chan_desc[frame->dl_chan].rts_fn;
+
+	/* only on bid == 0 */
+	if (bid != 0)
+		return 0;
+
+	/* no RTS function */
+	if (!func)
+		return 0;
+
+	/* check if channel is active */
+	if (!trx_chan_desc[chan].auto_active
+	 && !l1h->chan_states[tn][chan].dl_active)
+	 	return -EINVAL;
+
+	return func(l1h, tn, fn, frame->dl_chan);
+}
+
+/* process downlink burst */
+static const ubit_t *trx_sched_dl_burst(struct trx_l1h *l1h, uint8_t tn,
+	uint32_t fn)
+{
+	struct trx_sched_frame *frame;
+	uint8_t offset, period, bid;
+	trx_sched_dl_func *func;
+	enum trx_chan_type chan;
+	const ubit_t *bits = NULL;
+
+	if (!l1h->mf_index[tn])
+		goto no_data;
+
+	/* get frame from multiframe */
+	period = trx_sched_multiframes[l1h->mf_index[tn]].period;
+	offset = fn % period;
+	frame = trx_sched_multiframes[l1h->mf_index[tn]].frames + offset;
+  
+	chan = frame->dl_chan;
+	bid = frame->dl_bid;
+	func = trx_chan_desc[chan].dl_fn;
+
+	/* check if channel is active */
+	if (!trx_chan_desc[chan].auto_active
+	 && !l1h->chan_states[tn][chan].dl_active)
+	 	goto no_data;
+
+	/* get burst from function */
+	bits = func(l1h, tn, fn, chan, bid);
+
+no_data:
+	/* in case of C0, we need a dummy burst to maintain RF power */
+	if (bits == NULL && l1h->trx == l1h->trx->bts->c0) {
+if (0)		if (chan != TRXC_IDLE) // hack
+		LOGP(DL1C, LOGL_DEBUG, "No burst data for %s fn=%u ts=%u "
+			"burst=%d on C0, so filling with dummy burst\n",
+			trx_chan_desc[chan].name, fn, tn, bid);
+		bits = dummy_burst;
+	}
+
+	return bits;
+}
+
+/* process uplink burst */
+int trx_sched_ul_burst(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+	sbit_t *bits, int8_t rssi, int16_t toa)
+{
+	struct trx_sched_frame *frame;
+	uint8_t offset, period, bid;
+	trx_sched_ul_func *func;
+	enum trx_chan_type chan;
+	int rc;
+
+	if (!l1h->mf_index)
+		return -EINVAL;
+
+	/* get frame from multiframe */
+	period = trx_sched_multiframes[l1h->mf_index[tn]].period;
+	offset = fn % period;
+	frame = trx_sched_multiframes[l1h->mf_index[tn]].frames + offset;
+
+	chan = frame->ul_chan;
+	bid = frame->ul_bid;
+	func = trx_chan_desc[chan].ul_fn;
+
+	/* check if channel is active */
+	if (!trx_chan_desc[chan].auto_active
+	 && !l1h->chan_states[tn][chan].ul_active)
+	 	return -EINVAL;
+
+	/* put burst to function */
+	rc = func(l1h, tn, fn, chan, bid, bits, toa);
+
+	return rc;
+}
+
+/* schedule all frames of all TRX for given FN */
+static int trx_sched_fn(uint32_t fn)
+{
+	struct gsm_bts_trx *trx;
+	struct trx_l1h *l1h;
+	uint8_t tn;
+	const ubit_t *bits;
+	uint8_t gain;
+
+	/* send time indication */
+	l1if_mph_time_ind(bts, fn);
+
+	/* advance frame number, so the tranceiver has more time until
+	 * it must be transmitted. */
+	fn = (fn + trx_clock_advance) % 2715648;
+
+	/* process every TRX */
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		l1h = trx_l1h_hdl(trx);
+
+		/* we don't schedule, if power is off */
+		if (!l1h->config.poweron)
+			continue;
+
+		/* process every TS of TRX */
+		for (tn = 0; tn < 8; tn++) {
+			/* ignore disabled slots */
+			if (!(l1h->config.slotmask & (1 << tn)))
+				continue;
+			/* ready-to-send */
+			trx_sched_rts(l1h, tn,
+				(fn + trx_rts_advance) % 2715648);
+			/* get burst for FN */
+			bits = trx_sched_dl_burst(l1h, tn, fn);
+			if (!bits) {
+				/* if no bits, send dummy burst with no gain */
+				bits = dummy_burst;
+				gain = 128;
+			} else
+				gain = 0;
+			trx_if_data(l1h, tn, fn, gain, bits);
+		}
+	}
+
+	return 0;
+}
+
+
+/*
+ * frame clock
+ */
+
+#define FRAME_DURATION_uS	4615
+#define MAX_FN_SKEW		50
+#define TRX_LOSS_FRAMES		400
+
+extern int quit;
+/* this timer fires for every FN to be processed */
+static void trx_ctrl_timer_cb(void *data)
+{
+	struct timeval tv_now, *tv_clock = &tranceiver_clock_tv;
+	int32_t elapsed;
+
+	/* check if tranceiver is still alive */
+	if (tranceiver_lost++ == TRX_LOSS_FRAMES) {
+		struct gsm_bts_trx *trx;
+
+		LOGP(DL1C, LOGL_NOTICE, "No more clock from traneiver\n");
+
+		tranceiver_available = 0;
+
+		/* flush pending messages of transceiver */
+		llist_for_each_entry(trx, &bts->trx_list, list)
+			trx_if_flush(trx_l1h_hdl(trx));
+
+		/* start over provisioning tranceiver */
+		l1if_provision_tranceiver(bts);
+
+		return;
+	}
+
+	gettimeofday(&tv_now, NULL);
+
+	elapsed = (tv_now.tv_sec - tv_clock->tv_sec) * 1000000
+		+ (tv_now.tv_usec - tv_clock->tv_usec);
+
+	/* if someone played with clock, or if the process stalled */
+	if (elapsed > FRAME_DURATION_uS * MAX_FN_SKEW || elapsed < 0) {
+		LOGP(DL1C, LOGL_NOTICE, "PC clock skew: elapsed uS %d\n",
+			elapsed);
+		tranceiver_available = 0;
+		return;
+	}
+
+	while (elapsed > FRAME_DURATION_uS / 2) {
+		tv_clock->tv_usec += FRAME_DURATION_uS;
+		if (tv_clock->tv_usec >= 1000000) {
+			tv_clock->tv_sec++;
+			tv_clock->tv_usec -= 1000000;
+		}
+		tranceiver_last_fn = (tranceiver_last_fn + 1) % 2715648;
+		trx_sched_fn(tranceiver_last_fn);
+		elapsed -= FRAME_DURATION_uS;
+	}
+	osmo_timer_schedule(&tranceiver_clock_timer, 0, FRAME_DURATION_uS - elapsed);
+}
+
+
+/* receive clock from tranceiver */
+int trx_sched_clock(uint32_t fn)
+{
+	struct timeval tv_now, *tv_clock = &tranceiver_clock_tv;
+	int32_t elapsed;
+	int32_t elapsed_fn;
+
+	/* reset lost counter */
+	tranceiver_lost = 0;
+
+	gettimeofday(&tv_now, NULL);
+
+	/* clock becomes valid */
+	if (!tranceiver_available) {
+		LOGP(DL1C, LOGL_NOTICE, "initial GSM clock received: fn=%u\n",
+			fn);
+new_clock:
+		tranceiver_last_fn = fn;
+		trx_sched_fn(tranceiver_last_fn);
+
+		/* schedule first FN to be transmitted */
+		memcpy(tv_clock, &tv_now, sizeof(struct timeval));
+		tranceiver_available = 1;
+		tranceiver_clock_timer.cb = trx_ctrl_timer_cb;
+	        tranceiver_clock_timer.data = bts;
+		osmo_timer_schedule(&tranceiver_clock_timer, 0,
+			FRAME_DURATION_uS);
+
+		return 0;
+	}
+
+	osmo_timer_del(&tranceiver_clock_timer);
+
+	/* calculate elapsed time since last_fn */
+	elapsed = (tv_now.tv_sec - tv_clock->tv_sec) * 1000000
+		+ (tv_now.tv_usec - tv_clock->tv_usec);
+
+	/* how much frames have been elapsed since last fn processed */
+	elapsed_fn = (fn + 2715648 - tranceiver_last_fn) % 2715648;
+	if (elapsed_fn >= 135774)
+		elapsed_fn -= 2715648;
+
+	/* check for max clock skew */
+	if (elapsed_fn > MAX_FN_SKEW || elapsed_fn < -MAX_FN_SKEW) {
+		LOGP(DL1C, LOGL_NOTICE, "GSM clock skew: old fn=%u, "
+			"new fn=%u\n", tranceiver_last_fn, fn);
+		goto new_clock;
+	}
+
+	LOGP(DL1C, LOGL_INFO, "GSM clock jitter: %d\n", elapsed_fn * FRAME_DURATION_uS - elapsed);
+
+	/* too many frames have been processed already */
+	if (elapsed_fn < 0) {
+		/* set clock to the time or last FN should have been
+		 * transmitted. */
+		tv_clock->tv_sec = tv_now.tv_sec;
+		tv_clock->tv_usec = tv_now.tv_usec +
+			(0 - elapsed_fn) * FRAME_DURATION_uS;
+		if (tv_clock->tv_usec >= 1000000) {
+			tv_clock->tv_sec++;
+			tv_clock->tv_usec -= 1000000;
+		}
+		/* set time to the time our next FN hast to be transmitted */
+		osmo_timer_schedule(&tranceiver_clock_timer, 0,
+			FRAME_DURATION_uS * (1 - elapsed_fn));
+
+		return 0;
+	}
+
+	/* transmit what we still need to transmit */
+	while (fn != tranceiver_last_fn) {
+		tranceiver_last_fn = (tranceiver_last_fn + 1) % 2715648;
+		trx_sched_fn(tranceiver_last_fn);
+	}
+
+	/* schedule next FN to be transmitted */
+	memcpy(tv_clock, &tv_now, sizeof(struct timeval));
+	osmo_timer_schedule(&tranceiver_clock_timer, 0, FRAME_DURATION_uS);
+
+	return 0;
+}
+
diff --git a/src/osmo-bts-trx/scheduler.h b/src/osmo-bts-trx/scheduler.h
new file mode 100644
index 000000000..eb82327a2
--- /dev/null
+++ b/src/osmo-bts-trx/scheduler.h
@@ -0,0 +1,29 @@
+#ifndef TRX_SCHEDULER_H
+#define TRX_SCHEDULER_H
+
+extern uint32_t trx_clock_advance;
+extern uint32_t tranceiver_last_fn;
+
+
+int trx_sched_init(struct trx_l1h *l1h);
+
+void trx_sched_exit(struct trx_l1h *l1h);
+
+int trx_sched_ph_data_req(struct trx_l1h *l1h, struct osmo_phsap_prim *l1sap);
+
+int trx_sched_tch_req(struct trx_l1h *l1h, struct osmo_phsap_prim *l1sap);
+
+int trx_sched_clock(uint32_t fn);
+
+int trx_sched_ul_burst(struct trx_l1h *l1h, uint8_t tn, uint32_t fn,
+        sbit_t *bits, int8_t rssi, int16_t toa);
+
+/* set multiframe scheduler to given pchan */
+int trx_sched_set_pchan(struct trx_l1h *l1h, uint8_t tn,
+        enum gsm_phys_chan_config pchan);
+
+/* setting all logical channels given attributes to active/inactive */
+int trx_sched_set_lchan(struct trx_l1h *l1h, uint8_t chan_nr, uint8_t link_id,
+	int downlink, int active);
+
+#endif /* TRX_SCHEDULER_H */
diff --git a/src/osmo-bts-trx/tch_fr.c b/src/osmo-bts-trx/tch_fr.c
new file mode 100644
index 000000000..75f547527
--- /dev/null
+++ b/src/osmo-bts-trx/tch_fr.c
@@ -0,0 +1,310 @@
+/*
+ * tch_fr.c
+ *
+ * Copyright (c) 2013  Andreas Eversberg <jolly@eversberg.eu>
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/conv.h>
+#include <osmocom/core/crcgen.h>
+
+#include "xcch.h"
+#include "tch_fr.h"
+
+
+/*
+ * GSM TCH FR/EFR parity
+ *
+ * g(x) = x^3 + x + 1
+ */
+
+const struct osmo_crc8gen_code tch_fr_crc3 = {
+	.bits = 3,
+	.poly = 0x2,
+	.init = 0x0,
+	.remainder = 0x7,
+};
+
+
+/*
+ * GSM TCH FR/EFR convolutional coding
+ *
+ * G_0 = 1 + x^3 + x^4
+ * G_1 = 1 + x + x^3 + x^4
+ */
+
+static const uint8_t conv_tch_fr_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+
+static const uint8_t conv_tch_fr_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+
+static const struct osmo_conv_code conv_tch_fr = {
+	.N = 2,
+	.K = 5,
+	.len = 185,
+	.next_output = conv_tch_fr_next_output,
+	.next_state  = conv_tch_fr_next_state,
+};
+
+
+/*
+ * GSM TCH FR/EFR interleaving and burst mapping
+ *
+ * Interleaving:
+ *
+ * Given 456 coded input bits, form 8 blocks of 114 bits,
+ * where event bits of the first 4 block and off bits of the last 4 block
+ * are used:
+ *
+ *      i(B, j) = c(n, k)       k = 0, ..., 455
+ *                              n = 0, ..., N, N + 1, ...
+ *                              B = B_0 + 4n + (k mod 8)
+ *                              j = 2(49k mod 57) + ((k mod 8) div 4)
+ *
+ * Mapping on Burst:
+ *
+ *      e(B, j) = i(B, j)
+ *      e(B, 59 + j) = i(B, 57 + j)     j = 0, ..., 56
+ *      e(B, 57) = h_l(B)
+ *      e(B, 58) = h_n(B)
+ *
+ * Where hl(B) and hn(B) are bits in burst B indicating flags.
+ */
+
+static void
+tch_fr_deinterleave(sbit_t *cB, sbit_t *iB)
+{
+	int j, k, B;
+
+	for (k=0; k<456; k++) {
+		B = k & 7;
+		j = 2 * ((49 * k) % 57) + ((k & 7) >> 2);
+		cB[k] = iB[B * 114 + j];
+	}
+}
+
+static void
+tch_fr_interleave(ubit_t *cB, ubit_t *iB)
+{
+	int j, k, B;
+
+	for (k=0; k<456; k++) {
+		B = k & 7;
+		j = 2 * ((49 * k) % 57) + ((k & 7) >> 2);
+		iB[B * 114 + j] = cB[k];
+	}
+}
+
+static void
+tch_fr_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *h, int odd)
+{
+	int i;
+
+	/* brainfuck: only copy even or odd bits */
+	for (i=odd; i<57; i+=2)
+		iB[i] = eB[i];
+	for (i=58-odd; i<114; i+=2)
+		iB[i] = eB[i+2];
+
+	if (h && !odd)
+		*h = eB[57];
+
+	if (h && odd)
+		*h = eB[58];
+}
+
+static void
+tch_fr_burst_map(ubit_t *iB, ubit_t *eB, ubit_t *h, int odd)
+{
+	int i;
+
+	/* brainfuck: only copy even or odd bits */
+	for (i=odd; i<57; i+=2)
+		eB[i] = iB[i];
+	for (i=58-odd; i<114; i+=2)
+		eB[i+2] = iB[i];
+
+	if (h && !odd)
+		eB[57] = *h;
+	if (h && odd)
+		eB[58] = *h;
+}
+
+/* this corresponds to the bit-lengths of the individual codec
+ * parameters as indicated in Table 1.1 of TS 06.10 */
+static const uint8_t gsm_fr_map[] = {
+	6, 6, 5, 5, 4, 4, 3, 3,
+	7, 2, 2, 6, 3, 3, 3, 3,
+	3, 3, 3, 3, 3, 3, 3, 3,
+	3, 7, 2, 2, 6, 3, 3, 3,
+	3, 3, 3, 3, 3, 3, 3, 3,
+	3, 3, 7, 2, 2, 6, 3, 3,
+	3, 3, 3, 3, 3, 3, 3, 3,
+	3, 3, 3, 7, 2, 2, 6, 3,
+	3, 3, 3, 3, 3, 3, 3, 3,
+	3, 3, 3, 3
+};
+
+static void
+tch_fr_reassemble(uint8_t *tch_data, ubit_t *d_bits)
+{
+	int i, j, k, l, o;
+
+	tch_data[0] = 0xd << 4;
+	/* reassemble d-bits */
+	i = 0; /* counts bits */
+	j = 4; /* counts output bits */
+	k = gsm_fr_map[0]-1; /* current number bit in element */
+	l = 0; /* counts element bits */
+	o = 0; /* offset input bits */
+	while (i < 260) {
+		tch_data[j>>3] |= (d_bits[k+o] << (7-(j&7)));
+		if (--k < 0) {
+			o += gsm_fr_map[l];
+			k = gsm_fr_map[++l]-1;
+		}
+		i++;
+		j++;
+	}
+}
+
+static void
+tch_fr_disassemble(ubit_t *d_bits, uint8_t *tch_data)
+{
+	int i, j, k, l, o;
+
+	i = 0; /* counts bits */
+	j = 4; /* counts input bits */
+	k = gsm_fr_map[0]-1; /* current number bit in element */
+	l = 0; /* counts element bits */
+	o = 0; /* offset output bits */
+	while (i < 260) {
+		d_bits[k+o] = (tch_data[j>>3] >> (7-(j&7))) & 1;
+		if (--k < 0) {
+			o += gsm_fr_map[l];
+			k = gsm_fr_map[++l]-1;
+		}
+		i++;
+		j++;
+	}
+}
+
+static void
+tch_fr_unreorder(ubit_t *d, ubit_t *p, ubit_t *u)
+{
+	int i;
+
+	for (i=0; i<91; i++) {
+		d[i<<1] = u[i];
+		d[(i<<1)+1] = u[184-i];
+	}
+	for (i=0; i<3; i++)
+		p[i] = u[91+i];
+}
+
+static void
+tch_fr_reorder(ubit_t *u, ubit_t *d, ubit_t *p)
+{
+	int i;
+
+	for (i=0; i<91; i++) {
+		u[i] = d[i<<1];
+		u[184-i] = d[(i<<1)+1];
+	}
+	for (i=0; i<3; i++)
+		u[91+i] = p[i];
+}
+
+int
+tch_fr_decode(uint8_t *tch_data, sbit_t *bursts)
+{
+	sbit_t iB[912], cB[456], h;
+	ubit_t conv[185], d[260], p[3];
+	int i, rv, len, steal = 0;
+
+	for (i=0; i<8; i++) {
+		tch_fr_burst_unmap(&iB[i * 114], &bursts[i * 116], &h, i>>2);
+		if (h < 0)
+			steal++;
+	}
+
+	tch_fr_deinterleave(cB, iB);
+
+	if (steal < 4) {
+		osmo_conv_decode(&conv_tch_fr, cB, conv);
+
+		tch_fr_unreorder(d, p, conv);
+
+		for (i=0; i<78; i++)
+			d[i+182] = (cB[i+378] < 0) ? 1:0;
+
+		rv = osmo_crc8gen_check_bits(&tch_fr_crc3, d, 50, p);
+		if (rv)
+			return -1;
+
+		tch_fr_reassemble(tch_data, d);
+
+		len = 33;
+	} else {
+		rv = xcch_decode_cB(tch_data, cB);
+		if (rv)
+			return -1;
+
+		len = 23;
+	}
+
+	return len;
+}
+
+int
+tch_fr_encode(ubit_t *bursts, uint8_t *tch_data, int len)
+{
+	ubit_t iB[912], cB[456], h;
+	ubit_t conv[185], d[260], p[3];
+	int i;
+
+	switch (len) {
+	case 33: /* TCH FR */
+		tch_fr_disassemble(d, tch_data);
+
+		osmo_crc8gen_set_bits(&tch_fr_crc3, d, 50, p);
+
+		tch_fr_reorder(conv, d, p);
+
+		memcpy(cB+378, d+182, 78);
+
+		osmo_conv_encode(&conv_tch_fr, conv, cB);
+
+		h = 0;
+
+		break;
+	case 23: /* FACCH */
+		xcch_encode_cB(cB, tch_data);
+
+		h = 1;
+
+		break;
+	default:
+		return -1;
+	}
+
+	tch_fr_interleave(cB, iB);
+
+	for (i=0; i<8; i++)
+		tch_fr_burst_map(&iB[i * 114], &bursts[i * 116], &h, i>>2);
+
+	return 0;
+}
diff --git a/src/osmo-bts-trx/tch_fr.h b/src/osmo-bts-trx/tch_fr.h
new file mode 100644
index 000000000..68a931850
--- /dev/null
+++ b/src/osmo-bts-trx/tch_fr.h
@@ -0,0 +1,7 @@
+#ifndef _TCH_FR_H
+#define _TCH_FR_H
+
+int tch_fr_decode(uint8_t *tch_data, sbit_t *bursts);
+int tch_fr_encode(ubit_t *bursts, uint8_t *tch_data, int len);
+
+#endif /* _TCH_FR_H */
diff --git a/src/osmo-bts-trx/trx_if.c b/src/osmo-bts-trx/trx_if.c
new file mode 100644
index 000000000..abf992e07
--- /dev/null
+++ b/src/osmo-bts-trx/trx_if.c
@@ -0,0 +1,495 @@
+/*
+ * OpenBTS TRX interface handling
+ *
+ * Copyright (C) 2013  Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#include <netinet/in.h>
+
+#include <osmocom/core/select.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/bits.h>
+
+#include <osmo-bts/logging.h>
+#include <osmo-bts/bts.h>
+
+#include "l1_if.h"
+#include "trx_if.h"
+#include "scheduler.h"
+
+int tranceiver_available = 0;
+const char *tranceiver_ip = "127.0.0.1";
+
+/*
+ * socket
+ */
+
+static uint16_t base_port_local = 5800;
+
+/* open socket */
+static int trx_udp_open(void *priv, struct osmo_fd *ofd, uint16_t port,
+	int (*cb)(struct osmo_fd *fd, unsigned int what))
+{
+	struct sockaddr_storage sas;
+	struct sockaddr *sa = (struct sockaddr *)&sas;
+	socklen_t sa_len;
+
+	int rc;
+
+	/* Init */
+	ofd->fd = -1;
+	ofd->cb = cb;
+	ofd->data = priv;
+
+	/* Listen / Binds */
+	rc = osmo_sock_init_ofd(ofd, AF_UNSPEC, SOCK_DGRAM, 0, tranceiver_ip,
+		port, OSMO_SOCK_F_BIND);
+	if (rc < 0)
+		return rc;
+
+	/* Connect */
+	sa_len = sizeof(sas);
+	rc = getsockname(ofd->fd, sa, &sa_len);
+	if (rc)
+		return rc;
+
+	if (sa->sa_family == AF_INET) {
+		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
+		sin->sin_port = htons(ntohs(sin->sin_port) - 100);
+	} else if (sa->sa_family == AF_INET6) {
+		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
+		sin6->sin6_port = htons(ntohs(sin6->sin6_port) - 100);
+	} else {
+		return -EINVAL;
+	}
+
+	rc = connect(ofd->fd, sa, sa_len);
+	if (rc)
+		return rc;
+
+	
+	return 0;
+}
+
+/* close socket */
+static void trx_udp_close(struct osmo_fd *ofd)
+{
+	if (ofd->fd > 0) {
+		osmo_fd_unregister(ofd);
+		close(ofd->fd);
+		ofd->fd = -1;
+	}
+}
+
+
+/*
+ * clock
+ */
+
+static struct osmo_fd trx_ofd_clk;
+
+
+/* get clock from clock socket */
+static int trx_clk_read_cb(struct osmo_fd *ofd, unsigned int what)
+{
+	char buf[1500];
+	int len;
+
+	len = recv(ofd->fd, buf, sizeof(buf) - 1, 0);
+	if (len <= 0)
+		return len;
+	buf[len] = '\0';
+
+	if (!strncmp(buf, "IND CLOCK ", 10)) {
+		uint32_t fn;
+
+		sscanf(buf, "IND CLOCK %u", &fn);
+		LOGP(DTRX, LOGL_INFO, "Clock indication: fn=%u\n", fn);
+		trx_sched_clock(fn);
+	} else
+		LOGP(DTRX, LOGL_NOTICE, "Unknown message on clock port: %s\n",
+			buf);
+
+	return 0;
+}
+
+
+/*
+ * ctrl
+ */
+
+static void trx_ctrl_timer_cb(void *data);
+
+/* send first ctrl message and start timer */
+static void trx_ctrl_send(struct trx_l1h *l1h)
+{
+	struct trx_ctrl_msg *tcm;
+
+	/* get first command */
+	if (llist_empty(&l1h->trx_ctrl_list))
+		return;
+	tcm = llist_entry(l1h->trx_ctrl_list.next, struct trx_ctrl_msg, list);
+
+	LOGP(DTRX, LOGL_DEBUG, "Sending control '%s' to trx=%u\n", tcm->cmd,
+		l1h->trx->nr);
+	/* send command */
+	send(l1h->trx_ofd_ctrl.fd, tcm->cmd, strlen(tcm->cmd)+1, 0);
+
+	/* start timer */
+	l1h->trx_ctrl_timer.cb = trx_ctrl_timer_cb;
+	l1h->trx_ctrl_timer.data = l1h;
+	osmo_timer_schedule(&l1h->trx_ctrl_timer, 2, 0);
+}
+
+/* send first ctrl message and start timer */
+static void trx_ctrl_timer_cb(void *data)
+{
+	struct trx_l1h *l1h = data;
+
+	LOGP(DTRX, LOGL_NOTICE, "No response from tranceiver\n");
+
+	trx_ctrl_send(l1h);
+}
+
+/* add a new ctrl command */
+static int trx_ctrl_cmd(struct trx_l1h *l1h, const char *cmd, const char *fmt,
+	...)
+{
+	struct trx_ctrl_msg *tcm;
+	va_list ap;
+	int l;
+
+	/* create message */
+	tcm = talloc_zero(tall_bts_ctx, struct trx_ctrl_msg);
+	if (!tcm)
+		return -ENOMEM;
+	if (fmt && fmt[0]) {
+		l = snprintf(tcm->cmd, sizeof(tcm->cmd)-1, "CMD %s ", cmd);
+		va_start(ap, fmt);
+		vsnprintf(tcm->cmd + l, sizeof(tcm->cmd) - l - 1, fmt, ap);
+		va_end(ap);
+	} else
+		snprintf(tcm->cmd, sizeof(tcm->cmd)-1, "CMD %s", cmd);
+	tcm->cmd_len = strlen(cmd);
+	llist_add_tail(&tcm->list, &l1h->trx_ctrl_list);
+	LOGP(DTRX, LOGL_INFO, "Adding new control '%s'\n", tcm->cmd);
+
+	/* send message, if no pending message */
+	if (!osmo_timer_pending(&l1h->trx_ctrl_timer))
+		trx_ctrl_send(l1h);
+
+	return 0;
+}
+
+int trx_if_cmd_poweroff(struct trx_l1h *l1h)
+{
+	return trx_ctrl_cmd(l1h, "POWEROFF", "");
+}
+
+int trx_if_cmd_poweron(struct trx_l1h *l1h)
+{
+	return trx_ctrl_cmd(l1h, "POWERON", "");
+}
+
+int trx_if_cmd_settsc(struct trx_l1h *l1h, uint8_t tsc)
+{
+	return trx_ctrl_cmd(l1h, "SETTSC", "%d", tsc);
+}
+
+int trx_if_cmd_setbsic(struct trx_l1h *l1h, uint8_t bsic)
+{
+	return trx_ctrl_cmd(l1h, "SETBSIC", "%d", bsic);
+}
+
+int trx_if_cmd_setrxgain(struct trx_l1h *l1h, int db)
+{
+	return trx_ctrl_cmd(l1h, "SETRXGAIN", "%d", db);
+}
+
+int trx_if_cmd_setpower(struct trx_l1h *l1h, int db)
+{
+	return trx_ctrl_cmd(l1h, "SETPOWER", "%d", db);
+}
+
+int trx_if_cmd_setmaxdly(struct trx_l1h *l1h, int dly)
+{
+	return trx_ctrl_cmd(l1h, "SETMAXDLY", "%d", dly);
+}
+
+int trx_if_cmd_setslot(struct trx_l1h *l1h, uint8_t tn, uint8_t type)
+{
+	return trx_ctrl_cmd(l1h, "SETSLOT", "%d %d", tn, type);
+}
+
+int trx_if_cmd_rxtune(struct trx_l1h *l1h, uint16_t arfcn)
+{
+	uint16_t freq10;
+
+	freq10 = gsm_arfcn2freq10(arfcn, 1); /* RX = uplink */
+	if (freq10 == 0xffff) {
+		LOGP(DTRX, LOGL_ERROR, "Arfcn %d not defined.\n", arfcn);
+		return -ENOTSUP;
+	}
+
+	return trx_ctrl_cmd(l1h, "RXTUNE", "%d", freq10 * 100);
+}
+
+int trx_if_cmd_txtune(struct trx_l1h *l1h, uint16_t arfcn)
+{
+	uint16_t freq10;
+
+	freq10 = gsm_arfcn2freq10(arfcn, 0); /* TX = downlink */
+	if (freq10 == 0xffff) {
+		LOGP(DTRX, LOGL_ERROR, "Arfcn %d not defined.\n", arfcn);
+		return -ENOTSUP;
+	}
+
+	return trx_ctrl_cmd(l1h, "TXTUNE", "%d", freq10 * 100);
+}
+
+/* get response from ctrl socket */
+static int trx_ctrl_read_cb(struct osmo_fd *ofd, unsigned int what)
+{
+	struct trx_l1h *l1h = ofd->data;
+	char buf[1500];
+	int len, resp;
+
+	len = recv(ofd->fd, buf, sizeof(buf) - 1, 0);
+	if (len <= 0)
+		return len;
+	buf[len] = '\0';
+
+	if (!strncmp(buf, "RSP ", 4)) {
+		struct trx_ctrl_msg *tcm;
+		char *p;
+		int rsp_len = 0;
+
+		/* calculate the length of response item */
+		p = strchr(buf + 4, ' ');
+		if (p)
+			rsp_len = p - buf - 4;
+		else
+			rsp_len = strlen(buf) - 4;
+
+		LOGP(DTRX, LOGL_DEBUG, "Response message: '%s'\n", buf);
+
+		/* get command for response message */
+		if (llist_empty(&l1h->trx_ctrl_list)) {
+			LOGP(DTRX, LOGL_NOTICE, "Response message without "
+				"command\n");
+			return -EINVAL;
+		}
+		tcm = llist_entry(l1h->trx_ctrl_list.next, struct trx_ctrl_msg,
+			list);
+
+		/* check if respose matches command */
+		if (rsp_len != tcm->cmd_len) {
+			notmatch:
+			LOGP(DTRX, LOGL_NOTICE, "Response message '%s' does "
+				"not match command message '%s'\n", buf,
+				tcm->cmd);
+			return -EINVAL;
+		}
+		if (!!strncmp(buf + 4, tcm->cmd + 4, rsp_len))
+			goto notmatch;
+
+		/* check for response code */
+		if (*p) {
+			sscanf(p + 1, "%d", &resp);
+			if (resp) {
+				LOGP(DTRX, LOGL_ERROR, "Tranceiver rejected "
+					"TRX command with response: '%s'\n",
+					buf);
+			}
+		}
+
+		/* remove command from list */
+		llist_del(&tcm->list);
+		talloc_free(tcm);
+
+		/* abort timer and send next message, if any */
+		if (osmo_timer_pending(&l1h->trx_ctrl_timer))
+			osmo_timer_del(&l1h->trx_ctrl_timer);
+		trx_ctrl_send(l1h);
+	} else
+		LOGP(DTRX, LOGL_NOTICE, "Unknown message on ctrl port: %s\n",
+			buf);
+
+	return 0;
+}
+
+
+/*
+ * data
+ */
+
+static int trx_data_read_cb(struct osmo_fd *ofd, unsigned int what)
+{
+	struct trx_l1h *l1h = ofd->data;
+	uint8_t buf[256];
+	int len;
+	uint8_t tn;
+	int8_t rssi;
+	int16_t toa;
+	uint32_t fn;
+	sbit_t bits[148];
+	int i;
+
+	len = recv(ofd->fd, buf, sizeof(buf), 0);
+	if (len <= 0)
+		return len;
+	if (len != 158) {
+		LOGP(DTRX, LOGL_NOTICE, "Got data message with invalid lenght "
+			"'%d'\n", len);
+		return -EINVAL;
+	}
+	tn = buf[0];
+	fn = (buf[1] << 24) | (buf[2] << 16) | (buf[3] << 8) | buf[4];
+	rssi = (int8_t)buf[5];
+	toa = (int16_t)(buf[6] << 8) | buf[7];
+
+	/* copy and convert bits {254..0} to sbits {-127..127} */
+	for (i = 0; i < 148; i++) {
+		if (buf[8 + i] == 255)
+			bits[i] = -127;
+		else
+			bits[i] = 127 - buf[8 + i];
+	}
+
+	if (tn >= 8) {
+		LOGP(DTRX, LOGL_ERROR, "Illegal TS %d\n", tn);
+		return -EINVAL;
+	}
+	if (fn >= 2715648) {
+		LOGP(DTRX, LOGL_ERROR, "Illegal FN %u\n", fn);
+		return -EINVAL;
+	}
+
+	LOGP(DTRX, LOGL_DEBUG, "RX burst tn=%u fn=%u rssi=%d toa=%d ",
+		tn, fn, rssi, toa);
+
+	trx_sched_ul_burst(l1h, tn, fn, bits, rssi, toa);
+
+	return 0;
+}
+
+int trx_if_data(struct trx_l1h *l1h, uint8_t tn, uint32_t fn, uint8_t pwr,
+	const ubit_t *bits)
+{
+	uint8_t buf[256];
+
+	LOGP(DTRX, LOGL_DEBUG, "TX burst tn=%u fn=%u pwr=%u\n", tn, fn, pwr);
+
+	buf[0] = tn;
+	buf[1] = (fn >> 24) & 0xff;
+	buf[2] = (fn >> 16) & 0xff;
+	buf[3] = (fn >>  8) & 0xff;
+	buf[4] = (fn >>  0) & 0xff;
+	buf[5] = pwr;
+
+	/* copy ubits {0,1} */
+	memcpy(buf + 6, bits, 148);
+
+	/* we must be sure that we have clock, and we have sent all control
+	 * data */
+	if (tranceiver_available && llist_empty(&l1h->trx_ctrl_list)) {
+		send(l1h->trx_ofd_data.fd, buf, 154, 0);
+	} else
+		LOGP(DTRX, LOGL_DEBUG, "Ignoring TX data, tranceiver "
+			"offline.\n");
+
+	return 0;
+}
+
+
+/*
+ * open/close
+ */
+
+int trx_if_open(struct trx_l1h *l1h)
+{
+	int rc;
+
+	LOGP(DTRX, LOGL_NOTICE, "Open tranceiver for trx=%u\n", l1h->trx->nr);
+
+	/* open sockets */
+	if (l1h->trx->nr == 0) {
+		rc = trx_udp_open(NULL, &trx_ofd_clk, base_port_local,
+			trx_clk_read_cb);
+		if (rc < 0)
+			return rc;
+		LOGP(DTRX, LOGL_NOTICE, "Waiting for tranceiver send clock\n");
+	}
+	rc = trx_udp_open(l1h, &l1h->trx_ofd_ctrl,
+		base_port_local + (l1h->trx->nr << 1) + 1, trx_ctrl_read_cb);
+	if (rc < 0)
+		goto err;
+	rc = trx_udp_open(l1h, &l1h->trx_ofd_data,
+		base_port_local + (l1h->trx->nr << 1) + 2, trx_data_read_cb);
+	if (rc < 0)
+		goto err;
+
+	/* initialize ctrl queue */
+	INIT_LLIST_HEAD(&l1h->trx_ctrl_list);
+
+	/* enable all slots */
+	l1h->config.slotmask = 0xff;
+
+	return 0;
+
+err:
+	trx_if_close(l1h);
+	return rc;
+}
+
+/* flush pending control messages */
+void trx_if_flush(struct trx_l1h *l1h)
+{
+	struct trx_ctrl_msg *tcm;
+
+	/* free ctrl message list */
+	while (!llist_empty(&l1h->trx_ctrl_list)) {
+		tcm = llist_entry(l1h->trx_ctrl_list.next, struct trx_ctrl_msg,
+			list);
+		llist_del(&tcm->list);
+		talloc_free(tcm);
+	}
+}
+
+void trx_if_close(struct trx_l1h *l1h)
+{
+	LOGP(DTRX, LOGL_NOTICE, "Close tranceiver for trx=%u\n", l1h->trx->nr);
+
+	trx_if_flush(l1h);
+
+	/* close sockets */
+	if (l1h->trx->nr == 0)
+		trx_udp_close(&trx_ofd_clk);
+	trx_udp_close(&l1h->trx_ofd_ctrl);
+	trx_udp_close(&l1h->trx_ofd_data);
+}
+
diff --git a/src/osmo-bts-trx/trx_if.h b/src/osmo-bts-trx/trx_if.h
new file mode 100644
index 000000000..656bd6a7a
--- /dev/null
+++ b/src/osmo-bts-trx/trx_if.h
@@ -0,0 +1,29 @@
+#ifndef TRX_IF_H
+#define TRX_IF_H
+
+extern int tranceiver_available;
+extern const char *tranceiver_ip;
+
+struct trx_ctrl_msg {
+	struct llist_head	list;
+	char 			cmd[128];
+	int			cmd_len;
+};
+
+int trx_if_cmd_poweroff(struct trx_l1h *l1h);
+int trx_if_cmd_poweron(struct trx_l1h *l1h);
+int trx_if_cmd_settsc(struct trx_l1h *l1h, uint8_t tsc);
+int trx_if_cmd_setbsic(struct trx_l1h *l1h, uint8_t bsic);
+int trx_if_cmd_setrxgain(struct trx_l1h *l1h, int db);
+int trx_if_cmd_setpower(struct trx_l1h *l1h, int db);
+int trx_if_cmd_setmaxdly(struct trx_l1h *l1h, int dly);
+int trx_if_cmd_setslot(struct trx_l1h *l1h, uint8_t tn, uint8_t type);
+int trx_if_cmd_rxtune(struct trx_l1h *l1h, uint16_t arfcn);
+int trx_if_cmd_txtune(struct trx_l1h *l1h, uint16_t arfcn);
+int trx_if_data(struct trx_l1h *l1h, uint8_t tn, uint32_t fn, uint8_t pwr,
+	const ubit_t *bits);
+int trx_if_open(struct trx_l1h *l1h);
+void trx_if_flush(struct trx_l1h *l1h);
+void trx_if_close(struct trx_l1h *l1h);
+
+#endif /* TRX_IF_H */
diff --git a/src/osmo-bts-trx/trx_vty.c b/src/osmo-bts-trx/trx_vty.c
new file mode 100644
index 000000000..720f3538e
--- /dev/null
+++ b/src/osmo-bts-trx/trx_vty.c
@@ -0,0 +1,281 @@
+/* VTY interface for sysmoBTS */
+
+/* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#include <arpa/inet.h>
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/bits.h>
+
+#include <osmocom/vty/vty.h>
+#include <osmocom/vty/command.h>
+#include <osmocom/vty/misc.h>
+
+#include <osmo-bts/gsm_data.h>
+#include <osmo-bts/logging.h>
+#include <osmo-bts/vty.h>
+
+#include "l1_if.h"
+#include "scheduler.h"
+#include "trx_if.h"
+
+static struct gsm_bts *vty_bts;
+
+DEFUN(show_tranceiver, show_tranceiver_cmd, "show tranceiver",
+	SHOW_STR "Display information about tranceivers\n")
+{
+	struct gsm_bts *bts = vty_bts;
+	struct gsm_bts_trx *trx;
+	struct trx_l1h *l1h;
+	uint8_t tn;
+
+	if (!tranceiver_available) {
+		vty_out(vty, "Tranceiver is not connected%s", VTY_NEWLINE);
+	} else {
+		vty_out(vty, "Tranceiver is connected, current fn=%u%s",
+			tranceiver_last_fn, VTY_NEWLINE);
+	}
+
+	llist_for_each_entry(trx, &bts->trx_list, list) {
+		l1h = trx_l1h_hdl(trx);
+		vty_out(vty, "TRX %d%s", trx->nr, VTY_NEWLINE);
+		vty_out(vty, " %s%s",
+			(l1h->config.poweron) ? "poweron":"poweroff",
+			VTY_NEWLINE);
+		if (l1h->config.arfcn_valid)
+			vty_out(vty, " arfcn  : %d%s%s",
+				(l1h->config.arfcn & ~ARFCN_PCS),
+				(l1h->config.arfcn & ARFCN_PCS) ? " (PCS)" : "",
+				VTY_NEWLINE);
+		else
+			vty_out(vty, " arfcn  : undefined%s", VTY_NEWLINE);
+		if (l1h->config.tsc_valid)
+			vty_out(vty, " tsc    : %d%s", l1h->config.tsc,
+				VTY_NEWLINE);
+		else
+			vty_out(vty, " tsc    : undefined%s", VTY_NEWLINE);
+		if (l1h->config.bsic_valid)
+			vty_out(vty, " bsic   : %d%s", l1h->config.bsic,
+				VTY_NEWLINE);
+		else
+			vty_out(vty, " bisc   : undefined%s", VTY_NEWLINE);
+		if (l1h->config.rxgain_valid)
+			vty_out(vty, " rxgain : %d%s", l1h->config.rxgain,
+				VTY_NEWLINE);
+		else
+			vty_out(vty, " rxgain : undefined%s", VTY_NEWLINE);
+		if (l1h->config.power_valid)
+			vty_out(vty, " power  : %d%s", l1h->config.power,
+				VTY_NEWLINE);
+		else
+			vty_out(vty, " power  : undefined%s", VTY_NEWLINE);
+		if (l1h->config.maxdly_valid)
+			vty_out(vty, " maxdly : %d%s", l1h->config.maxdly,
+				VTY_NEWLINE);
+		else
+			vty_out(vty, " maxdly : undefined%s", VTY_NEWLINE);
+		for (tn = 0; tn < 8; tn++) {
+			if (!((1 << tn) & l1h->config.slotmask))
+				vty_out(vty, " slot #%d: unsupported%s", tn,
+					VTY_NEWLINE);
+			else if (l1h->config.slottype_valid[tn])
+				vty_out(vty, " slot #%d: type %d%s", tn,
+					l1h->config.slottype[tn],
+					VTY_NEWLINE);
+			else
+				vty_out(vty, " slot #%d: undefined%s", tn,
+					VTY_NEWLINE);
+		}
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_bts_fn_advance, cfg_bts_fn_advance_cmd,
+	"fn-advance <0-30>",
+	"Set the number of frames to be transmitted in advance of current FN\n"
+	"Advance in frames\n")
+{
+	trx_clock_advance = atoi(argv[0]);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trx_rxgain, cfg_trx_rxgain_cmd,
+	"rxgain <0-50>",
+	"Set the receiver gain in dB\n"
+	"Gain in dB\n")
+{
+	struct gsm_bts_trx *trx = vty->index;
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	l1h->config.rxgain = atoi(argv[0]);
+	l1h->config.rxgain_valid = 1;
+	l1h->config.rxgain_sent = 0;
+	l1if_provision_tranceiver_trx(l1h);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trx_power, cfg_trx_power_cmd,
+	"power <0-50>",
+	"Set the transmitter power dampening\n"
+	"Power dampening in dB\n")
+{
+	struct gsm_bts_trx *trx = vty->index;
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	l1h->config.power = atoi(argv[0]);
+	l1h->config.power_valid = 1;
+	l1h->config.power_sent = 0;
+	l1if_provision_tranceiver_trx(l1h);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trx_maxdly, cfg_trx_maxdly_cmd,
+	"maxdly <0-31>",
+	"Set the maximum delay of GSM symbols\n"
+	"GSM symbols (approx. 1.1km per symbol)\n")
+{
+	struct gsm_bts_trx *trx = vty->index;
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	l1h->config.maxdly = atoi(argv[0]);
+	l1h->config.maxdly_valid = 1;
+	l1h->config.maxdly_sent = 0;
+	l1if_provision_tranceiver_trx(l1h);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trx_slotmask, cfg_trx_slotmask_cmd,
+	"slotmask (1|0) (1|0) (1|0) (1|0) (1|0) (1|0) (1|0) (1|0)",
+	"Set the supported slots\n"
+	"TS0 supported\nTS0 unsupported\nTS1 supported\nTS1 unsupported\n"
+	"TS2 supported\nTS2 unsupported\nTS3 supported\nTS3 unsupported\n"
+	"TS4 supported\nTS4 unsupported\nTS5 supported\nTS5 unsupported\n"
+	"TS6 supported\nTS6 unsupported\nTS7 supported\nTS7 unsupported\n")
+{
+	struct gsm_bts_trx *trx = vty->index;
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+	uint8_t tn;
+
+	l1h->config.slotmask = 0;
+	for (tn = 0; tn < 8; tn++)
+		if (argv[tn][0] == '1')
+			l1h->config.slotmask |= (1 << tn);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trx_no_rxgain, cfg_trx_no_rxgain_cmd,
+	"no rxgain <0-50>",
+	NO_STR "Unset the receiver gain in dB\n"
+	"Gain in dB\n")
+{
+	struct gsm_bts_trx *trx = vty->index;
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	l1h->config.rxgain_valid = 0;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trx_no_power, cfg_trx_no_power_cmd,
+	"no power <0-50>",
+	NO_STR "Unset the transmitter power dampening\n"
+	"Power dampening in dB\n")
+{
+	struct gsm_bts_trx *trx = vty->index;
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	l1h->config.power_valid = 0;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trx_no_maxdly, cfg_trx_no_maxdly_cmd,
+	"no maxdly <0-31>",
+	NO_STR "Unset the maximum delay of GSM symbols\n"
+	"GSM symbols (approx. 1.1km per symbol)\n")
+{
+	struct gsm_bts_trx *trx = vty->index;
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	l1h->config.maxdly_valid = 0;
+
+	return CMD_SUCCESS;
+}
+
+void bts_model_config_write_bts(struct vty *vty, struct gsm_bts *bts)
+{
+	vty_out(vty, " fn-advance %d%s", trx_clock_advance, VTY_NEWLINE);
+}
+
+void bts_model_config_write_trx(struct vty *vty, struct gsm_bts_trx *trx)
+{
+	struct trx_l1h *l1h = trx_l1h_hdl(trx);
+
+	if (l1h->config.rxgain_valid)
+		vty_out(vty, "  rxgain %d%s", l1h->config.rxgain, VTY_NEWLINE);
+	if (l1h->config.power_valid)
+		vty_out(vty, "  power %d%s", l1h->config.power, VTY_NEWLINE);
+	if (l1h->config.maxdly_valid)
+		vty_out(vty, "  maxdly %d%s", l1h->config.maxdly, VTY_NEWLINE);
+	if (l1h->config.slotmask != 0xff)
+		vty_out(vty, "  slotmask %d %d %d %d %d %d %d %d%s",
+			l1h->config.slotmask & 1,
+			(l1h->config.slotmask >> 1) & 1,
+			(l1h->config.slotmask >> 2) & 1,
+			(l1h->config.slotmask >> 3) & 1,
+			(l1h->config.slotmask >> 4) & 1,
+			(l1h->config.slotmask >> 5) & 1,
+			(l1h->config.slotmask >> 6) & 1,
+			l1h->config.slotmask >> 7,
+			VTY_NEWLINE);
+}
+
+int bts_model_vty_init(struct gsm_bts *bts)
+{
+	vty_bts = bts;
+
+	install_element_ve(&show_tranceiver_cmd);
+
+	install_element(BTS_NODE, &cfg_bts_fn_advance_cmd);
+
+	install_element(TRX_NODE, &cfg_trx_rxgain_cmd);
+	install_element(TRX_NODE, &cfg_trx_power_cmd);
+	install_element(TRX_NODE, &cfg_trx_maxdly_cmd);
+	install_element(TRX_NODE, &cfg_trx_slotmask_cmd);
+	install_element(TRX_NODE, &cfg_trx_no_rxgain_cmd);
+	install_element(TRX_NODE, &cfg_trx_no_power_cmd);
+	install_element(TRX_NODE, &cfg_trx_no_maxdly_cmd);
+
+	return 0;
+}
diff --git a/src/osmo-bts-trx/xcch.c b/src/osmo-bts-trx/xcch.c
new file mode 100644
index 000000000..024bf0713
--- /dev/null
+++ b/src/osmo-bts-trx/xcch.c
@@ -0,0 +1,193 @@
+/*
+ * xcch.c
+ *
+ * Copyright (c) 2011  Sylvain Munaut <tnt@246tNt.com>
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/conv.h>
+#include <osmocom/core/crcgen.h>
+
+#include "xcch.h"
+
+
+/*
+ * GSM xCCH parity (FIRE code)
+ *
+ * g(x) = (x^23 + 1)(x^17 + x^3 + 1)
+ *      = x^40 + x^26 + x^23 + x^17 + x^3 + 1
+ */
+
+const struct osmo_crc64gen_code xcch_crc40 = {
+	.bits = 40,
+	.poly = 0x0004820009ULL,
+	.init = 0x0000000000ULL,
+	.remainder = 0xffffffffffULL,
+};
+
+
+/*
+ * GSM xCCH convolutional coding
+ *
+ * G_0 = 1 + x^3 + x^4
+ * G_1 = 1 + x + x^3 + x^4
+ */
+
+static const uint8_t conv_xcch_next_output[][2] = {
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 3, 0 }, { 2, 1 }, { 3, 0 }, { 2, 1 },
+	{ 0, 3 }, { 1, 2 }, { 0, 3 }, { 1, 2 },
+};
+
+static const uint8_t conv_xcch_next_state[][2] = {
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+	{  0,  1 }, {  2,  3 }, {  4,  5 }, {  6,  7 },
+	{  8,  9 }, { 10, 11 }, { 12, 13 }, { 14, 15 },
+};
+
+static const struct osmo_conv_code conv_xcch = {
+	.N = 2,
+	.K = 5,
+	.len = 224,
+	.next_output = conv_xcch_next_output,
+	.next_state  = conv_xcch_next_state,
+};
+
+
+/*
+ * GSM xCCH interleaving and burst mapping
+ *
+ * Interleaving:
+ *
+ * Given 456 coded input bits, form 4 blocks of 114 bits:
+ *
+ *      i(B, j) = c(n, k)       k = 0, ..., 455
+ *                              n = 0, ..., N, N + 1, ...
+ *                              B = B_0 + 4n + (k mod 4)
+ *                              j = 2(49k mod 57) + ((k mod 8) div 4)
+ *
+ * Mapping on Burst:
+ *
+ *      e(B, j) = i(B, j)
+ *      e(B, 59 + j) = i(B, 57 + j)     j = 0, ..., 56
+ *      e(B, 57) = h_l(B)
+ *      e(B, 58) = h_n(B)
+ *
+ * Where hl(B) and hn(B) are bits in burst B indicating flags.
+ */
+
+static void
+xcch_deinterleave(sbit_t *cB, sbit_t *iB)
+{
+	int j, k, B;
+
+	for (k=0; k<456; k++) {
+		B = k & 3;
+		j = 2 * ((49 * k) % 57) + ((k & 7) >> 2);
+		cB[k] = iB[B * 114 + j];
+	}
+}
+
+static void
+xcch_interleave(ubit_t *cB, ubit_t *iB)
+{
+	int j, k, B;
+
+	for (k=0; k<456; k++) {
+		B = k & 3;
+		j = 2 * ((49 * k) % 57) + ((k & 7) >> 2);
+		iB[B * 114 + j] = cB[k];
+	}
+}
+
+static void
+xcch_burst_unmap(sbit_t *iB, sbit_t *eB, sbit_t *hl, sbit_t *hn)
+{
+	memcpy(iB,    eB,    57);
+	memcpy(iB+57, eB+59, 57);
+
+	if (hl)
+		*hl = eB[57];
+
+	if (hn)
+		*hn = eB[58];
+}
+
+static void
+xcch_burst_map(ubit_t *iB, ubit_t *eB, ubit_t *hl, ubit_t *hn)
+{
+	memcpy(eB,    iB,    57);
+	memcpy(eB+59, iB+57, 57);
+
+	if (hl)
+		eB[57] = *hl;
+	if (hn)
+		eB[58] = *hn;
+}
+
+int
+xcch_decode_cB(uint8_t *l2_data, sbit_t *cB)
+{
+	ubit_t conv[224];
+	int rv;
+
+	osmo_conv_decode(&conv_xcch, cB, conv);
+
+	rv = osmo_crc64gen_check_bits(&xcch_crc40, conv, 184, conv+184);
+	if (rv)
+		return -1;
+
+	osmo_ubit2pbit_ext(l2_data, 0, conv, 0, 184, 1);
+
+	return 0;
+}
+
+int
+xcch_decode(uint8_t *l2_data, sbit_t *bursts)
+{
+	sbit_t iB[456], cB[456];
+	int i;
+
+	for (i=0; i<4; i++)
+		xcch_burst_unmap(&iB[i * 114], &bursts[i * 116], NULL, NULL);
+
+	xcch_deinterleave(cB, iB);
+
+	return xcch_decode_cB(l2_data, cB);
+}
+
+int
+xcch_encode_cB(ubit_t *cB, uint8_t *l2_data)
+{
+	ubit_t conv[224];
+
+	osmo_pbit2ubit_ext(conv, 0, l2_data, 0, 184, 1);
+
+	osmo_crc64gen_set_bits(&xcch_crc40, conv, 184, conv+184);
+
+	osmo_conv_encode(&conv_xcch, conv, cB);
+
+	return 0;
+}
+
+int
+xcch_encode(ubit_t *bursts, uint8_t *l2_data)
+{
+	ubit_t iB[456], cB[456], hl = 1, hn = 1;
+	int i;
+
+	xcch_encode_cB(cB, l2_data);
+
+	xcch_interleave(cB, iB);
+
+	for (i=0; i<4; i++)
+		xcch_burst_map(&iB[i * 114], &bursts[i * 116], &hl, &hn);
+
+	return 0;
+}
diff --git a/src/osmo-bts-trx/xcch.h b/src/osmo-bts-trx/xcch.h
new file mode 100644
index 000000000..8e7d39296
--- /dev/null
+++ b/src/osmo-bts-trx/xcch.h
@@ -0,0 +1,10 @@
+#ifndef _XCCH_H
+#define _XCCH_H
+
+int xcch_decode_cB(uint8_t *l2_data, sbit_t *cB);
+int xcch_decode(uint8_t *l2_data, sbit_t *bursts);
+int xcch_encode_cB(ubit_t *cB, uint8_t *l2_data);
+int xcch_encode(ubit_t *bursts, uint8_t *l2_data);
+
+#endif /* _XCCH_H */
+