msc {
	hscale = 2;

	chan [label="Channel"], rc [label="Radio Carrier"], smg [label="Site Manager"], bts [label="BTS"], bsc [label="BSC"];

	bts => bsc  [label="TCP Connect (Port 3003, OML)"];
	bts box bsc [label="IPA CCM Identification (Port 3003)"];
	|||;
	smg => bsc  [label="(Site Mgr) STATE CHG REP (Disabled/NotInstalled)"];
	bts => bsc  [label="(BTS) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	rc => bsc   [label="(TRANSC) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 0) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 1) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 2) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 3) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 4) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 5) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 6) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	chan => bsc [label="(Ch 7) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	rc => bsc   [label="(RC) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	bts => bsc  [label="(GPRS-NSE) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	bts => bsc  [label="(GPRS-CELL) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	bts => bsc  [label="(GPRS-NSVC0) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	bts => bsc  [label="(GPRS-NSVC1) STATE CHG REP (Disabled/NotInstalled/Locked)"];
	|||;
	smg => bsc  [label="(Site Mgr) SW Activate Req"];
	smg <= bsc  [label="(Site Mgr) SW Activate Req Ack"];
	smg <= bsc  [label="(Site Mgr) Activate SW"];
	smg => bsc  [label="(Site Mgr) Activate SW Ack"];
	smg => bsc  [label="(Site Mgr) STATE CHG REP (Enabled)"];
	smg => bsc  [label="(Site Mgr) SW Activated Report"];
	smg <= bsc  [label="(Site Mgr) OPSTART"];
	smg => bsc  [label="(Site Mgr) OPSTART ACK"];
}