Nortel Enterprise 1000 Reference Manual page 117

Table 18
DX signaling — outgoing calls with originating party release
Condition
Idle
Seizure
(dial tone from far-end: far-end ready for digits)
Digits
Far-end answers
Far-end on hook first
Network taken down and trunk idled when near-
end goes on hook
Near-end on hook first, network taken down
Far-end on hook, trunk idled
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
Table 18 on page 117 and Figure 19 on page 118 show call-connection and
take-down sequencing for DX signaling. Table 20 on page 119 and Figure 21
on page 120 show sequencing where the E&M trunk card is used in a tandem
PBX.
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
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State of trunk
detector
High
High
High
Low
High
High
Low
High