Nortel Enterprise 1000 Reference Manual page 120

Page 120 of 236
Table 21
DX signaling — incoming calls with originating party release on tandem connections
Condition
Idle
Seizure
(Succession CSE 1000 may be arranged for IS,
DD, or WS)
Near-end ready for digits
Dial CO/FX/WATS and office DN
If a ground start*, the stored digits are sent out on
CO/FX/WATS trunk after ground detection. If a
loop start, the stored digits are outpulsed on CO/
FX/WATS trunk after 3 seconds.
If answer supervision is enabled, pseudo-answer
supervision is sent approximately 13 seconds
after last dial pulse is received
If no-answer supervision is enabled, CO end
disconnects
Originating end disconnects – network torn down
and trunk idled
553-3023-211 Standard 1.00 June 2001
NT8D15 E&M Trunk Card
Note: * – CO ground start: the trunk is idled and the network taken
down, but the incoming tie trunk is controlled by the originating end.
Current in
signaling lead
No current flow
Current flow
Current flow interrupted
for each pulse
No current flow
Current flow
No current flow
State of trunk
detector
High
Low
Low-high-low
for each pulse
Low
Low
High