Nortel Networks NN43001-106 - Manual (Page 98)

98 2 Mbps Digital Trunk Interface Enhancements
Call Clearance
This enhancement affects the handling of incoming and outgoing call
clearance for Central Office (CO) calls.
Call Clearance is handled differently if the Clear Forward signal (CLRF) is
defined, or if the Clear Forward signal and the IDLE signal do not have the
same definition. The Call Clearance is also handled differently for outgoing
and incoming calls.
For outgoing calls being disconnected by the system, a clear forward and
then an IDLE signal is sent by the system. The call state determines when
the IDLE signal is sent. If the call is answered, the IDLE signal is sent within
300 milliseconds of the reception of a clear back signal from the CO. If the
outgoing call is not answered, the IDLE signal is sent after 800 milliseconds
(plus or minus 50 milliseconds) of the clear forward signal being sent. If the
CO answers during this 800 milliseconds period, the system continues to
send the clear forward signal until it receives a clear back signal from the CO.
For outgoing calls being disconnected by the CO, a clear back signal is sent
by the CO when it wishes to disconnect. The system then sends a clear
forward signal within 300 milliseconds of having received the clear back
signal, followed by an IDLE signal within 800 milliseconds (plus or minus 50
milliseconds) of having sent the clear forward signal.
For incoming calls being disconnected by the system, a clear back signal is
sent by the system. Upon receiving a clear forward signal from the CO, the
system sends an IDLE signal within 300 milliseconds of having received the
clear forward signal.
For incoming calls being disconnected by the CO, a clear forward signal is
sent by the CO when it wishes to disconnect. If the call is answered, the
system sends a clear back signal within 300 milliseconds of having received
the clear back signal from the CO, and then an IDLE signal after 800
milliseconds (plus or minus 50 milliseconds) of having sent the clear forward
signal. If the call is not answered, the system sends an IDLE signal within
300 milliseconds of having received the clear forward signal from the CO.
If an alarm condition occurs while a clear forward or clear back signal is
being sent for the 800 milliseconds time period, the system continues to
send the signal until the alarm condition clears.
Clock Synchronization
This enhancement affects the clock synchronization controller. If a DTI loop
enters its most severe alarm state (the No-New-Calls state), the system
disables the clock port.
Nortel Communication Server 1000
Features and Services - Book 1 of 6 (A to B)
NN43001-106 01.04 Standard
Release 5.0 27 July 2007
Copyright © 2007, Nortel Networks
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