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msc {
hscale = "1.5";
phy,bts,pcu,bsc;
--- [ label = "...Voice call 1 ends" ];
bts => bsc [ label = "Release Ind" ];
bsc => bts [ label = "RSL RF Channel Release (TCH/H)" ];
bts => phy [ label = "L1 chan Deactivate SAPIs" ];
bts -> bsc [ label = "RSL RF Channel Release Ack (TCH/H)" ];
--- [ label = "BSC notices: one chan still in use"];
--- [ label = "...Voice call 2 ends" ];
bts => bsc [ label = "Release Ind" ];
bsc => bts [ label = "RSL RF Channel Release (TCH/H)" ];
bts => phy [ label = "L1 chan Deactivate SAPIs" ];
bts -> bsc [ label = "RSL RF Channel Release Ack (TCH/H)" ];
phy box bsc [ label = "If all channels on TS are released, PDCH Activation" ];
bsc => bts [ label = "RSL Channel Activation (PDCH)" ];
bts -> bsc [ label = "RSL Channel Activation Ack (PDCH) (unconditionally)" ];
--- [ label = "BTS notices: chan still connected as TCH/H, reconnect" ];
bts => phy [ label = "L1 chan Disconnect TCH/H" ];
phy -> bts [ label = "L1 chan Disconnect confirm" ];
bts => phy [ label = "L1 chan Connect PDTCH" ];
phy -> bts [ label = "L1 chan Connect confirm" ];
--- [ label = "chan reconnect as PDTCH complete" ];
bts => pcu [ label = "Info Ind (Activate)" ];
pcu => bts [ label = "chan Activate request" ];
bts => phy [ label = "L1 chan Activate PDTCH SAPIs" ];
phy -> bts [ label = "L1 chan Activate SAPIs confirm" ];
}
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