Nortel Enterprise 1000 Reference Manual page 118

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Table 19
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
Network taken down and trunk idled
Near-end on hook first, network taken down
Far-end on hook, trunk idled
553-3023-211 Standard 1.00 June 2001
NT8D15 E&M Trunk Card
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
State of trunk
detector
High
Low
Low-high-low
for each pulse
Low
High
High
Low
High