59 lines
1.5 KiB
XML
59 lines
1.5 KiB
XML
<?xml version="1.0"?>
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<block>
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<name>TRX Burst Interface</name>
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<key>gsm_trx_burst_if</key>
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<import>import grgsm</import>
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<make>grgsm.trx_burst_if($remote_addr, $base_port)</make>
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<param>
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<name>base_port</name>
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<key>base_port</key>
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<value>5700</value>
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<type>string</type>
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</param>
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<param>
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<name>remote_addr</name>
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<key>remote_addr</key>
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<value>127.0.0.1</value>
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<type>string</type>
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</param>
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<sink>
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<name>bursts</name>
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<type>message</type>
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<optional>1</optional>
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</sink>
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<source>
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<name>bursts</name>
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<type>message</type>
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<optional>1</optional>
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</source>
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<doc>
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OsmoTRX like UDP burst interface for external applications.
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There are two UDP connections, where each message carries
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one radio burst with header. Give a base port B (5700 by default).
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One connection at port P=B+100+2 is used for sending received bursts
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to an external application. Another one at port P=B+2 is used to
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obtain to be transmitted bursts.
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Received burst format:
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1 byte timeslot index
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4 bytes GSM frame number, big endian
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1 byte RSSI in -dBm
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2 bytes correlator timing offset in 1/256 symbol steps,
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2's-comp, big endian
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148 bytes soft symbol estimates, 0 -> definite "0",
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255 -> definite "1"
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To be transmitted burst format:
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1 byte timeslot index
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4 bytes GSM frame number, big endian
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1 byte transmit level wrt ARFCN max, -dB (attenuation)
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148 bytes output symbol values, 0 & 1
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</doc>
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</block>
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