Nortel Circuit Card 311 Reference page 760

760 NT8D15 E and M Trunk card
For descriptive purposes, the lead pair Tip B/Ring B is designated the
signaling pair. The other pair Tip A/Ring A conducts current in the opposite
direction to balance the overall current flow between the near and far ends.
During signaling, current flows through both Tip B and Ring B leads in the
same direction.
Table 273 "DX signaling - outgoing calls with originating party release" (page
760)
release" (page 760)
DX signaling.
release on tandem connections" (page 761)
- incoming calls with originating party release on tandem connections"
(page 761)
a tandem PBX.
Table 273
DX signaling - outgoing calls with originating party release
Condition
Idle
Seizure
(dial tone from far-end: far-end ready for digits)
Digits
Far-end answers
Far-end on hook first
Network taken down and trunk idled when
near-end goes on hook
Near-end on hook first, network taken down
Far-end on hook, trunk idled
Table 274
DX signaling - incoming calls with originating party release
Condition
Idle
Seizure
(dial tone to far-end: near-end ready for digits)
Digits
Near-end answers
Far-end on hook first
Copyright © 2003-2008, Nortel Networks
.
and Table 274 "DX signaling - incoming calls with originating party
show call-connection and take-down sequencing for
Table 275 "DX signaling - outgoing calls with originating party
show sequencing where the E and M Trunk card is used in
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
and Table 276 "DX signaling
Current in
signaling lead
No current flow
Current flow
Current flow interrupted
for each pulse
No current flow
Current flow
No current flow
Current flow
No current flow
Current in
signaling lead
No current flow
Current flow
Current flow interrupted
for each pulse
No current flow
Current flow
State of trunk
detector
High
High
High
Low
High
High
Low
High
State of trunk
detector
High
Low
Low-high-low
for each pulse
Low
High