Nortel 1000 Features And Services Fundamentals page 513

It should be noted that although CMOD units are equipped according to the
traffic requirement of CLASS sets in a network group for the intergroup
junctor traffic consideration, they are a system resource shared by the
whole system.
Operating parameters
Dialed Number Identification System (DNIS) is not supported by the CLASS
feature.
This feature has been developed for the North American residential market,
as well as for the small business, hospitality, schools and universities,
nursing homes and hospitals, and mobile home markets.
This feature applies to a standalone environment, and to an ISDN
networking environment supporting CLID and a non-ISDN networking
environment with or without In-Band Automatic Number Identification (ANI).
If the CLASS Calling Number Delivery and CLASS Calling Name Delivery
data to a CLASS set is lost, there is no indication, such as an error
message, provided. The call is presented in the normal manner, as if the
CLASS CND function has not been activated.
A maximum of 10 digits can be delivered as the calling number, and a
maximum of 15 characters can be delivered as the calling name. These are
Bellcore limitations.
The 16 port Analog Message Waiting line card (QPC789A) is not supported
for CLASS: Calling Number and Name Delivery.
Up to 255 CLASS modems can be configured on a system, and up to 32
CLASS modem units can be configured on any Extended CLASS Modem
card.
No CLASS CND traffic measurement is supported.
The CND delivery interval is the first silent interval, after ringing has been
applied for a new call, that is greater than two seconds. If the ringing applied
to the CLASS set uses a cadence with a ring-off cycle that is more than
four seconds in duration, then the CLASS set might view the call as having
been disconnected and might clear the CND display as a result. This is a
CLASS set firmware limitation.
Due to firmware limitations on some types of CLASS sets, after a call has
been disconnected, the CND information associated with the disconnected
call may still appear on the CLASS set's display for several seconds. During
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
Operating parameters 513