Nortel 1000 Features And Services Fundamentals page 494

494 CLASS: Calling Number and Name Delivery
The calling number and/or calling name data is delivered from the system
to the CLASS sets using FSK signaling by a CLASS modem (CMOD) unit.
The CMOD units are configured using LD 13. They are supported by an
Extended CLASS Modem (XCMC) IPE line card, the NT5D60AA.
Up to 255 CMOD units may be configured on a system that is equipped
with the CLASS CND feature. Once configured, the CMODs are shared
throughout a multi-customer system. When a call is presented to a CLASS
set, an available CMOD is automatically allocated.
Upon reaching the CND delivery interval, the appropriate CND information
is delivered to the CLASS set. The CND delivery interval is the first silent
interval, after ringing has been applied for a new call, that is greater
than two seconds. The allocated CMOD unit is released when ringing
resumes on the CLASS set after the CND delivery interval, or when the
call is disconnected, answered, or redirected. If the call is disconnected,
answered, or redirected before the CND delivery interval has been reached,
then no CND information is delivered. If the call is disconnected, answered,
or redirected while the CND information is being delivered, the CND delivery
is immediately terminated.
is idle" (page 494)
delivery interval" (page 496)
resource allocation scenario for a new call being presented on a CLASS set.
Figure 13
System allocation when a CLASS set is idle
Copyright © 1994–2008, Nortel Networks
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to Figure 16 "System resource allocation after the CND
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 13 "System allocation when a CLASS set
depict a typical call processing and system