[comp.dcom.telecom] Glare

MYERSTON@KL.SRI.COM (HECTOR MYERSTON) (01/12/89)

	Ref Hiraki@ecf-toronto's query.
	The condition you describe is known as glare and is as old as the
hills.  The way to avoid it is not to use ground-start for two-way trunks.
The way to >minimize< is to have one end select trnks from the "top" of
the trunk group, the other from the "bottom".  You will still occasionally
get glare but less often.
	Ground Start is the common signaling method for this type of trunk.
Trunk seizure is initiated from either end by grounding one of the wires.
Normally (a dangerous word to use here) the PBX grounds the Ring and the
CO grounds the Tip to initiate calls.