Nortel 1000 Features And Services Fundamentals page 501

Figure 17
A system with a two-group network
Note that traffic to a CLASS set can be originated from a non-CLASS set,
another CLASS set or an incoming trunk. Since trunks have more traffic
impact on junctor blocking, they are used to illustrate the feature operation,
however, both sets and trunks can be traffic sources to CLASS sets.
The maximum size system comprises of 5 network groups. Each group has
32 loops of which 28 can be terminal loops, the rest are service loops (TDS
loops for tones, conference and music).
From Group 0 to Group 1, as shown in
two-group network" (page
there are another 8 one way junctors from Group 1 to Group 0. For practical
purposes, they can be treated as 8 two-way junctors. A two-way path is
equal to a voice channel. A junctor has 30 voice traffic channels as on a
loop. Each two-way channel represents a conversation path. A channel is
also used to deliver the CND from the CMOD to a CLASS set.
CLASS feature operation
A call originated from Set A (or trunk A) seeks to terminate on a CLASS set
B. When B starts to ring, A will hear ringback. A unit in CMOD (CLASS
Modem) is assigned to collect originator's CND information and waits for
the CND delivery interval. After the first ring at B, a silence period (deliver
interval) ensues, the CMOD unit begins to deliver CND information to the
CLASS set.
Copyright © 1994–2008, Nortel Networks
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Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
Figure 17 "A system with a
501), there are 8 one-way junctors. Similarly,
Feature description 501