Nortel Networks NN43001-106 - Manual (Page 101)

Feature description 101
Outgoing Central Office Trunk (COT) call
If the destination has not answered, no action is taken when entering an
alarm state. If the originator goes on-hook during an alarm state, the
disconnect signal is delayed.
If the destination goes on-hook while in an alarm state, the software waits
for the originator to go on-hook also. If the alarm is still present when the
originator goes on-hook, system resources are idled, but the trunk is left in
a delayed disconnect state.
Incoming COT call
Call initiated When entering an alarm state, the call is disconnected and
all system resources are idled, including the trunk itself.
If the Attendant or Night telephone answered before the trunk entered the
alarm state, the call is connected and the "CONNECT" signal is delayed
until the alarm state is cleared.
Disconnect The system completes the disconnect and idles the trunk
without waiting for an "IDLE" signal from the far end.
Centre National des Études des Télécommunications
enhancement for trunk cards exiting an alarm state
This enhancement requires the QPC915 and ensures compliance with the
Centre National des Études des Télécommunications (CNET) requirements
for cards exiting an alarm state.
At the end of a group I alarm state, the software requires the pack to send
the ABCD status of each configured trunk. At the end of a group II alarm
state, the software receives a report of valid ABCD status after having
received a confirmation from the firmware that the firmware is functioning as
expected. The system software state is updated according to this report.
Processing of overload conditions
Several enhancements occur:
• When receiving more than 100 messages per second from a 2 Mbps
Digital Trunk Interface (QPC915) pack, the system attempts to go
into No New Call (NNC) state and disables the error reporting. A
DTA320 message is printed on the Maintenance Terminal to inform the
technician. After at least two seconds have elapsed, the error reporting
is re-enabled and a DTA321 message is printed. If this situation repeats
itself more than 20 times within the next two minutes, the pack is
disabled.
• The software status is updated to reflect the firmware status after
overload.
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
.