Computer Hardware Installation Guide

Operation 763
Condition
Current in
signaling lead
State of trunk
detector
Digits Current flow interrupted
for each pulse
High
Far-end answers No current flow Low
Far-end on hook first Current flow High
Network taken down and trunk idled when
near-end goes on hook
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
Table 278
DX signaling - incoming calls with originating party release
Condition
Current in
signaling lead
State of trunk
detector
Idle No current flow High
Seizure
(dial tone to far-end: near-end ready for digits)
Current flow Low
Digits Current flow interrupted
for each pulse
Low-high-low for each
pulse
Near-end answers No current flow Low
Far-end on hook first Current flow High
Network taken down and 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
Table 279
DX signaling - outgoing calls with originating party release on tandem connections
Condition
Current in
signaling lead
State of trunk
detector
Idle No current flow High
Seizure (far-end ready for digits) Current flow High
Dial CO/FX/WATS Current flow interrupted
for each pulse
High
Stop sender No current flow Low
Go sender (universal service provided by far-end
PBX if originating end is senderized)
Current flow High
CO/FX/WATS offices ready for digits
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.