Avaya S8700 Maintenance Manual page 977

ATM-SGRP (ATM Signaling Group)
If no other symptoms are present, no action is required. If layer-3
communication is down:
a. Check for alarms and errors against link components
b. Check out other errors against ATM-SGRP, ATM-TRK, and other
There is no test to clear these errors. The error counter is decremented by
1 every 15 minutes.
b. Error Type 18: the ATM circuit pack has been busied out (either busyout
atm sig-grp or busyout board UUCSS).
1. Release the ATM signaling group (release atm sig-grp) or the
c. Error Type 257: the primary signaling channel connection has been lost for
more than 90 seconds.
1. Pay particular attention to the results of Test #636 (Primary
2. When this error occurs, the state of the Signaling Group is changed
d. Error Type 769: signaling link hardware error.
Service-affecting failures of the hardware used to transport the D channel
are reported to the ATM CES Signaling Group MO. Maintenance logs this
error, places the D channel into the OOS state, and raises a board-level
alarm. The D channel is returned to service, and the alarm is retired once
the hardware failure condition clears.
e. Error Type 1281: Degraded PVC alarms indicate that a particular
Permanent Virtual Circuit, or signaling group, has encountered sufficient
errors to exceed firmware thresholds. Operations can continue but at a
lower level of reliability or performance. Firmware filters these alarms so
that only one is reported active at a given time. The following in-line error
is considered a Degraded PVC alarm:
555-233-143
hardware components on the link.
circuit pack (release board UUCSS).
The associated B channels are placed in the ISDN
Maintenance/Far-End state.
The B channels are not usable for outgoing calls, although incoming
calls can be accepted.
The switch automatically attempts to recover the signaling link.
Signaling Link Hardware Check) in the test sequence.
When the link does recover, the B channels are negotiated back to
the In-Service state and their alarms are retired.
to out-of-service (verify using the status sig-group command).
Excessive AAL – The AAL layer is experiencing an excessive
number of errors in trying to reconstruct Service Data Units (SDUs).
Possible causes:
— Problem with the ATM switch
— Noisy communication paths on opposite side of ATM switch
— Unhealthy sending node
— Congestion at the ATM switch
Issue 1 May 2002 8-255