Nortel Networks NN43001-106 - Manual (Page 100)

100 2 Mbps Digital Trunk Interface Enhancements
64 Kbit Alarm Indication Signal Handling
This enhancement adds the 64 Kbit Alarm Indication Signal (AIS) as a
sixth group II error state. This error state is treated the same as the other
group II error states.
Centre National des Études des Télécommunications
enhancement for trunks entering an alarm state
This enhancement requires the QPC915 and ensures compliance with the
Centre National des Études des Télécommunications (CNET) requirements
for trunks entering an alarm state.
Trunks entering an alarm state are processed according to the type of trunk
they are configured as and their previous state.
For all cases, signaling will not occur on the trunk while it is in an alarm state.
Idle trunk
When an idle trunk enters an alarm state, it will not send the "FAULT" signal.
DID trunk
Trunk seized and receiving digits The call is taken down and the trunk
is idled.
Call initiated but not answered A timer is started when the alarm state
is entered, its duration is between 20 and 40 seconds, and the called
telephone continues to ring. During this time one of three cases may occur:
• The timer expires: the call is disconnected, all resources but the
incoming trunk are released (delayed disconnect). This occurs even if
the following case has already happened.
• The called telephone answers: no affect on the timer; the delayed
disconnect will occur if the alarm is not cleared.
• The alarm stops: no affect on the connection, the timer is stopped and
reset, and delayed signals are sent to the far end.
Call answered The call is not dropped upon entering an alarm state. If
the near-end party goes on-hook during alarm, the party is released and all
resources are idled except the trunk, which is put in a delayed disconnect
state.
Disconnect The alarm is ignored with respect to internal system
processing, and the trunk is put in a delayed disconnect state.
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
.