Nortel Circuit Card 311 Reference page 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
call from CO" (page 617)
sequence - incoming call from CO" (page
Copyright © 2003-2008, Nortel Networks
.
Figure 171 "DID trunk, loop DR call states - incoming
and Figure 172 "DID trunk, loop DR call connection
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Operation 615
618).