40 lines
1.3 KiB
Plaintext
40 lines
1.3 KiB
Plaintext
# MO Call on a classic E1 Abis BTS with classic E1 A BSC
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# not actually supported by OsmoBSC (nor planned), for reference only
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msc {
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hscale=2;
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ms [label="MS"], bts [label="E1 BTS"], bsc[label="OsmoBSC"], trau[label="TRAU"], m_sc[label="MSC"];
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ms box m_sc [label="We assume a SDCCH is already established"];
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...;
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ms -> m_sc [label="DTAP CC SETUP"];
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ms <- m_sc [label="DTAP CC CALL PROCEEDING"];
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bsc <- m_sc [label="BSSAP ASSGN REQ"];
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bsc box m_sc [label="E1 TS for PCM specified by CIC"];
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bts <- bsc [label="RSL CHAN ACT"];
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bts -> bsc [label="RSL CHAN ACT ACK"];
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bts box bsc [label="E1 TS + 16k sub-slot configured for given lchan"];
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ms <-> bsc [label="Assignment"];
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bsc -> m_sc [label="BSSAP ASSGN CMPL"];
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...;
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trau <- m_sc [label="PCM Audio in full E1 slot"];
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bts <- trau [label="A-bis TRAU frames on 16k sub-slot"];
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...;
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ms <- m_sc [label="DTAP CC CONNECT"];
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ms -> m_sc [label="DTAP CC CONNECT ACK"];
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trau <-> m_sc [label="PCM Audio in full E1 slot"];
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bts <-> trau [label="A-bis TRAU frames on 16k sub-slot"];
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--- [label="Voice Call in Progress"];
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ms <- m_sc [label="DTAP CC DISCONNET"];
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ms <- m_sc [label="DTAP CC RELEASE"];
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ms <- m_sc [label="DTAP CC RELEASE COMPL"];
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...;
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bsc <- m_sc [label="BSSMAP CLEAR CMD"];
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bsc -> m_sc [label="BSSMAP CLEAR COMPL"];
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bsc <- m_sc [label="SCCP RLSD"];
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bsc -> m_sc [label="SCCP RLC"];
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}
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