Nortel 1000 Features And Services Fundamentals page 500

500 CLASS: Calling Number and Name Delivery
This engineering section examines the inter-group junctor blocking issue
and provides recommend engineering rules to alleviate potential network
congestion problems.
In general, the engineering effort for CLASS feature can be classified into
three categories:
A new site following engineering rules (see
for non-Call Center applications" (page
traffic check-off.
An existing or new site with relatively low intergroup junctor traffic, will
require only one XCMC (Extended CLASS Modem Card) IPE pack that can
serve all CLASS sets in a multi-group system.
An existing site with heavy intergroup junctor traffic will require either moving
trunks/sets around between network groups when only one XCMC pack is
equipped or providing an XCMC pack (or packs) for each group.
System multi-group network
This section is only relevant to a system multi-group network. A single group
system does not have intergroup junctors. Therefore, special engineering
on the junctor is not applicable. The Cabinet system have network
architectures that are different from other systems.
It has a non-blocking network and does not require any network engineering,
except to use
MODem) capacity table to find the number of modems needed.
In general, intergroup junctor blocking is most severe when there are only
two groups, since under typical traffic distribution assumptions, 50% of calls
will stay in the originating group and 50% will terminate on the second group
through junctors, unless a Community Of Interest (COI) is known and taken
into consideration in engineering to minimize intergroup traffic.
Under the assumption of even distribution of traffic, the percentage of traffic
to an intergroup junctor will drop to 33.3% of the total group traffic for a
three-group system. Similarly, the junctor traffic is 25% of group traffic for a
four-group system and 20% for a five-group system.
A simplified system with two-group network and CLASS sets is shown by
Figure 17 "A system with a two-group network" (page
Copyright © 1994–2008, Nortel Networks
.
Table 10 "CMOD unit capacity" (page 504)
Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
"General engineering guidelines
505)) requires no inter group junctor
CMOD (Class
501).