Nortel Enterprise 1000 Reference Manual page 119

Table 20
DX signaling — outgoing calls with originating party release on tandem connections
Condition
Idle
Seizure (far-end ready for digits)
Dial CO/FX/WATS
Stop sender
Go sender (universal service provided by far-end
PBX if originating end is senderized)
CO/FX/WATS offices ready for digits
Stored Office DN digits
Outpulsed
Far-end answers
Far-end on hook first
Near-end on hook, network taken down, trunk
idled
Near-end on hook first, network taken down
Far-end on hook, trunk idled
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
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
Current flow interrupted
for each pulse
No current flow
No current flow
Current flow
No current flow
Current flow
No current flow
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State of trunk
detector
High
High
High
Low
High
High
Low
Low
High
High
Low
High