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msc {
hscale = "1.5";
phy,bts,pcu,bsc;
bts => bsc [ label = "RSL Chan Requested" ];
phy box bsc [ label = "TS is in PDCH mode, deactivate" ];
bsc => bts [ label = "RSL RF Channel Release (PDCH)" ];
bts => pcu [ label = "Info Ind (Deactivate)" ];
pcu => bts [ label = "Chan Deactivate request" ];
bts => phy [ label = "L1 chan Deactivate PDTCH SAPIs" ];
phy -> bts [ label = "L1 chan Deactivate SAPIs confirm" ];
bts -> bsc [ label = "RSL RF Channel Release Ack (PDCH)" ];
phy box bsc [ label = "Activate TCH/H" ];
bsc => bts [ label = "RSL Channel Activation (TCH/H)" ];
--- [ label = "BTS notices: chan still connected as PDTCH, reconnect" ];
bts => phy [ label = "L1 chan Disconnect PDTCH" ];
phy -> bts [ label = "L1 chan Disconnect confirm" ];
bts => phy [ label = "L1 chan Connect TCH/H" ];
phy -> bts [ label = "L1 chan Connect confirm" ];
--- [ label = "chan reconnect as TCH/H complete" ];
bts => phy [ label = "L1 chan Activate SAPIs" ];
bts -> bsc [ label = "RSL Channel Activation Ack (TCH/H)" ];
--- [ label = "Voice call 1 commences..." ];
phy box bsc [ label = "A second voice call is requested" ];
bts => bsc [ label = "RSL Chan Requested" ];
phy box bsc [ label = "BSC finds second slot on dynamic TS in TCH/H mode" ];
bsc => bts [ label = "RSL Channel Activation (TCH/H)" ];
bts => phy [ label = "L1 chan Activate SAPIs" ];
bts -> bsc [ label = "RSL Channel Activation Ack (TCH/H)" ];
--- [ label = "Voice call 2 commences..." ];
}
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