Nortel Networks 311 사용자 설명서

588

NT8D14 Universal Trunk card

Figure 148
Loop start call connection sequence - incoming call from CO/FX/WATS

The alerting signal is 20 Hz ringing sent by North American CO. When an
incoming call is answered, ringing is tripped when the trunk places a low
resistance DC loop towards the CO.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008