Nortel Networks 1000 - Manual (Page 503)

Operation 503
Figure 131
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 tripped when the
Meridian 1 places a low-resistance dc loop across the tip and ring leads
toward the CO. See
Figure 137 "Loop start call states - incoming call from
CO/FX/WATS" (page 510) and Figure 138 "Loop start call connection
sequence - incoming call from CO/FX/WATS" (page 511) .
The alerting signal into the CS 1000 is 20 Hz (nominal) ringing sent by the
CO. When an incoming call is answered, ringing is tripped when the CS
1000 places a low-resistance dc loop across the tip and ring leads toward
the CO. See
Figure 133 "Loop start call states - incoming call" (page
505) and Figure 134 "Loop start call connection sequence - incoming call"
(page 506) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.