OsmoPCU: add MSC chart
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msc {
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hscale="1.2";
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sgsn [label="SGSN"], pcu [label="PCU"], bts [label="BTS"], bsc [label="BSC"];
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bts box bsc [label="A-bis connection"];
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pcu <: bts [label="Config. parameters"];
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pcu rbox pcu [label="listen on UDP socket"];
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pcu note sgsn [label="send to SGSN UDP (port 23000)"];
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pcu => sgsn [label="NS RESET"];
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pcu <= sgsn [label="NS RESET ACK"];
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...;
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pcu => sgsn [label="NS UNBLOCK"];
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pcu <= sgsn [label="NS UNBLOCK ACK"];
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pcu box sgsn [label="NS link established"];
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...;
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pcu => sgsn [label="BVC RESET"];
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pcu <= sgsn [label="BVC RESET ACK"];
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...;
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pcu => sgsn [label="BVC UNBLOCK"];
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pcu <= sgsn [label="BVC UNBLOCK ACK"];
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pcu box sgsn [label="BSSGP link established"];
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|||;
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}
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