Nortel Networks Circuit Card 311 - Manual (Page 625)

Operation 625
Figure 178
Two-way, loop DR, TIE trunk call connection sequence - incoming call from far-end PBX
In an incoming call configuration, the far-end initiates a call by placing a
low-resistance loop across the tip and ring leads. See
Figure 187 "Two-way,
loop DR, tie trunk call states - incoming call from far-end PBX" (page
635)
and Figure 188 "Two-way, loop DR, tie trunk call connection sequence
- incoming call from far-end PBX" (page 636) on. This causes a current to
flow through the battery feed resistors in the trunk circuit. Address signaling
is then applied by the far-end in the form of DTMF tones or dial pulses.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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