ATM-SGRP (ATM Signaling Group)
Issue 5 October 2002
749
555-233-119
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
circuit pack (release board UUCSS).
c. Error Type 257: the primary signaling channel connection has been lost for
more than 90 seconds.
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The associated B-channels are placed in the ISDN
Maintenance/Far-End state.
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The B-channels are not usable for outgoing calls, although incoming
calls can be accepted.
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The switch automatically attempts to recover the signaling link.
1. Look at the results of Test #636 (Primary Signaling Link Hardware
Check) in the test sequence.
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When the link does recover, the B-channels are negotiated back to
the In-Service state and their alarms are retired.
2. When this error occurs, the state of the Signaling Group is changed
to out-of-service (verify using the status sig-group command).
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:
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Excessive AAL - The AAL layer is experiencing an excessive
number of errors in trying to reconstruct Service Data Unit (SDUs).
Possible causes:
— Something may be wrong with the ATM switch.
— The communication paths on the other side of the ATM
switch may be noisy.
— The sending node might not be healthy.
— Could be a problem with congestion on the ATM switch.