Nortel Networks 553-3001-211 manual NT8D15 E&M Trunk card Page 639

NT8D15 E&M Trunk card Page 639 of 894

Table 195

DX signaling – outgoing calls with originating party release on tandem connections (Part 2 of 2)

	Current in	State of trunk
Condition	signaling lead	detector
Near end on hook first, network taken down	Current flow	Low
Far end on hook, trunk idled	No current flow	High

Table 196

DX signaling – incoming calls with originating party release on tandem connections

	Current in	State of trunk
Condition	signaling lead	detector
Idle	No current flow	High
Seizure	Current flow	Low
(Can be arranged for IS, DD, or WS)
(near-end ready for digits)
Dial CO/FX/WATS and office DN	Current flow interrupted	Low-high-low
	for each pulse	for each pulse
Stored digits outpulsed on CO/FX/WATS trunk
after ground detection if a ground start, but after 3
seconds if a loop start
If answer supervision: pseudo-answer supervision	No current flow	Low
is sent approximately 13 seconds after last dial
pulse received
If no answer supervision: CO end disconnects (if	Current flow	Low
a CO ground start – the trunk is idled and network
taken down, but the incoming TIE trunk is held
under control of the originating end)
Originating end disconnects – network taken	No current flow	High
down and trunk idled

Circuit Card Description and Installation