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