Avaya Definity SI Maintenance Manual page 1748

Maintenance Object Repair Procedures
b. This error indicates that the primary signaling channel connection has been
lost for more than 90 seconds. If a secondary signaling channel does not
exist or is not in-service, the associated B-channels will be placed in the
ISDN Maintenance/Far-End state. The B-channels will not be usable for
outgoing calls, although incoming calls will still be accepted. The switch will
automatically attempt to recover the signaling link. Pay particular attention
to the results of Test #636 (Primary Signaling Link Hardware Check) in the
test sequence. When the link does recover, the B-channels will be
negotiated back to the In-Service state and their alarms will be retired.
When this error occurs, the state of the Signaling Group is changed to
out-of-service (verify using the status sig-group command).
c. This error indicates that the secondary signaling channel connection has
been lost for more than 90 seconds. If the primary signaling channel is not
in-service, B-channels will be placed in the ISDN Maintenance/Far-End
state. The B-channels will not be usable for outgoing calls, although
incoming calls will still be accepted. The switch will automatically attempt to
recover the signaling link. Pay particular attention to the results of Test
#639 (Secondary Signaling Link Hardware Check) in the test sequence.
When the link does recover, the B-channels will be negotiated back to the
In-Service state and their alarms will be retired.
When this error occurs, the state of the Signaling Group is changed to
out-of-service (verify using the status sig-group command).
d. This error indicates a failure of the Layer 2 Status Query Test for the
primary signaling channel
e. This error indicates a failure of the Layer 2 Status Query Test for the
secondary signaling channel.
f. A specific message was sent to the far-end switch, and it did not respond
within the allotted time. Investigate elements of the ISDN PRI D-channel(s)
(ISDN-LNK, ISDN-PLK, ISDN-SGRP, PI-LINK, PI-PT, PKT-CTRL) for both
this switch and the Far-end switch. If Test #637 fails twice in a row, the
B-channels will be alarmed and made unavailable for outgoing calls
(although incoming calls will still be accepted). When Test #637 succeeds
and the Far-end switch starts responding properly, the DS1 ISDN Trunk
(B-channels) will be placed back into normal operation and their alarms will
be retired.
g. A SERV or SERV ACK ISDN D-channel message has been received by a
non-US-type interface (country option other than 1 on the DS1
administration form). However, these messages are used only for duplex
NFAS signaling which is supported only by country protocol 1.
Thus, there may be a mismatch in administration between the local and
far-end switches. Consult with the customer's network provider to
determine whether the D-channel is set up correctly on the far-end switch.
10-962 Issue 4 May 2002 555-233-123