Nortel Networks 1000 - Manual (Page 684)

684 NT8D15 E and M Trunk card
Table 254
DX signaling - incoming calls with originating party release on tandem connections (cont’d.)
Condition
Current in signaling
lead State of trunk
detector
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 for
signaling as well as for voice transmission. 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.
Figure 231
Signaling orientation for tandem connection between E and M and CO trunks
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
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