Operation 587
Figure 147
Loop start call states - incoming call from CO/FX/WATS
The alerting signal into the Meridian 1 is 20 Hz (nominal) ringing sent by
the CO. When an incoming call is answered,ringing is tr ipped when the
Meridian 1 places a low-resistance dc loop across the tip and ring leads
toward the CO. See Figure 153 "Loop start call states - incoming call from
CO/FX/WATS"(page 594) and Figure 154 "Loop star t call connection
sequence - incoming call from CO/FX/WATS"(page 595).
The alerting signal into the CS 1000 is 20 Hz (nominal) ringing sent by
the CO. When an incoming call is answered,ringing is tr ipped when the
CS 1000 places a low-resistance dc loop across the tip and ring leads
toward the CO.See Figure 149 "Loop start call states - incoming call" (page
589) and Figure 150 "Loop start call connection sequence - incoming call"
(page 590).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.