Nortel Networks Circuit Card 311 - Manual (Page 615)

Operation 615
Figure 170
Loop start call connection sequence
Direct inward dial operation
Incoming calls
An incoming call from the CO places a low-resistance loop across the tip
and ring leads. See
Figure 171 "DID trunk, loop DR call states - incoming
call from CO" (page 617) and Figure 172 "DID trunk, loop DR call connection
sequence - incoming call from CO" (page 618) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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.