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msc {
hscale = "1.2";
phy,bts,pcu,bsc;
phy box bsc [ label = "PDCH Deactivation" ];
bsc => bts [ label = "IPAC PDCH DEACT" ];
--- [ label = "Disconnect PDTCH" ];
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 => phy [ label = "L1 chan Disconnect PDTCH" ];
phy -> bts [ label = "L1 chan Disconnect confirm" ];
--- [ label = "Connect TCH" ];
bts => phy [ label = "L1 chan Connect TCH" ];
phy -> bts [ label = "L1 chan Connect confirm" ];
bts => bsc [ label = "IPAC PDCH DEACT ACK" ];
phy box bsc [ label = "Now BSC may use TCH (example)" ];
bsc => bts [ label = "Activate TCH/F" ];
bts => phy [ label = "L1 chan Activate SAPIs" ];
--- [ label = "Voice call..." ];
}
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