NT8D15 E&M Trunk card Page 639 of 894
Circuit Card Description and Installation
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
Condition
Current in
signaling lead
State of trunk
detector
Idle No current flow High
Seizure
(Can be arranged for IS, DD, or WS)
Current flow Low
(near-end ready for digits)
Dial CO/FX/WATS and office DN Current flow 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
Table 195
DX signaling – outgoing calls with originating party release on tandem connections
(Part 2 of 2)
Condition
Current in
signaling lead
State of trunk
detector