764 NT8D15 E and M Trunkcard
Condition Current in
signaling lead State of trunk
detector
Stored Office DN digits Currentflow interrupted
for each pulse High
Outpulsed No current flow Low
Far end answers No current flow Low
Far end on hook first Current flow High
Near end on hook, network taken down, trunk
idled No current flow High
Near end on hook first, network taken down Current flow Low
Far end on hook, trunk idled No current flow High
Table280
DX signaling - incoming calls with originating party release on tandem connections
Condition Current in signaling
lead State of trunk
detector
Idle No current flow High
Seizure
(Meridian 1 may be arranged for IS, DD, or WS)
(near-end ready for digits)
Current flow Low
Dial CO/FX/WATS and office DN Currentflow interrupted
for each pulse Low-high-low 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 is sent approximately 13 seconds
after last dial pulse received
No current flow Low
If no answer supervision: CO end disconnects
(if 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)
Current flow Low
Originating end disconnects – network taken
down and trunk idled No current flow High
Duplex (DX) signaling makes use of the voice transmission leads forsignaling as well as for voicetransmission. For descriptive purposes, thelead pair Tip B/Ring B is designated the signaling pair. The other pair TipA/Ring A conducts current in the opposite direction to balance the overallcurrent flow between the near and far ends. During signaling, current flowsthrough both Tip B and Ring B leads in the same direction.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.