Nortel Networks NN43001-106 Network engineering for CLASS sets

Feature description 499

For an ISDN trunk-to-CLASS set call, the calling name delivered to the

CLASS set is the calling name received from the incoming ISDN trunk (if the

calling name is longer than 15 characters, only the ﬁrst 15 is delivered). If

the calling name is deﬁned as presentation denied (the originating set has

Display Name Denied, Calling Party Privacy, or Calling Line Identiﬁcation

Restriction active), then the calling name privacy indicator is delivered in

place of the calling number, or, if no calling number is passed on by the

incoming trunk, then the calling name unknown indicator is delivered in

place of the calling name. The calling name privacy indicator, per Bellcore

CLASS CND delivery standard, refers to the ASCI "P" that is sent in place

of the calling name.

For a station (set)-to-CLASS set call, the calling name delivered to the

CLASS set is one of the following:

•The calling name associated with the originating DN (if the calling name

is longer than 15 characters, only the ﬁrst 15 is delivered).

•If no name is deﬁned with the originating DN, then the calling name

unknown indicator is delivered in place of the calling name.

•If the originating set has Display Name Deny Class of Service

(CLS=NAMD in LD 10 or 11), then the calling name privacy indicator is

delivered in place of the calling name.

For a station (attendant)-to-CLASS set call, the calling number delivered to

the CLASS set is one of the following:

•The calling name associated with the customer’s attendant DN (if the

calling name is longer than 15 characters, only the ﬁrst 15 is delivered).

•If no name is associated with the customer’s attendant DN, then calling

name unknown indicator is delivered in place of the calling name.

Network engineering for CLASS sets

In a system with a single group network, the network internal blocking

is determined by the concentration ratio of equipped ports on Intelligent

Peripheral Equipment and the number of interfaced loops or superloops.

Depending on trafﬁc engineering, a non-blocking network is achievable.

In a multi-group system, intergroup junctors are required to switch calls

between two network groups. Due to the concentration of time slots from

a network group to that of intergroup junctors, blocking may occur. This is

true for a multi-group system with or without CLASS sets. However, since

the CLASS feature depends on a voice path to deliver Calling Name and

Number Delivery (CND) to a set, excessive congestion at the intergroup

junctor could block the delivery of CND and diminish the usefulness of the

feature, as well as impact the grade of service of the existing equipment

on the system.

Nortel Communication Server 1000

Features and Services Fundamentals — Book 2 of 6 (C)

NN43001-106 02.04 Standard

Release 5.5 9 May 2008