msc {
	bts [label="Site Manager"], bsc [label="BSC"];
	# this is for the Site Manager Object
	---		[label="Initial state after establishing OML"];
	bts => bsc	[label="STATE CHG REP (Disabled/Notinstalled)"];
	---		[label="MO requests software activation"];
	bts => bsc	[label="SW Activate Req"];
	bts <= bsc	[label="SW Activate Req Ack"];
	---		[label="BTS instructs BTS to activate software"];
	bts <= bsc	[label="Activate SW"];
	bts => bsc	[label="Activate SW Ack"];
	---		[label="MO reports new state after SW activation"];
	bts => bsc	[label="STATE CHG REP (Enabled)"];
	bts => bsc	[label="SW Activated Report"];
	bts <= bsc	[label="OPSTART"];
	bts => bsc	[label="OPSTART ACK"];
}