Avaya S8700 Maintenance Manual page 1701

ISDN-SGR (ISDN-PRI Signaling Group)
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 Query Test for the primary
signaling channel
e. This error indicates a failure of the Layer 2 Query Test for the secondary
signaling channel.
f. This error indicates a failure of the Remote Layer 3 Query test (#637). 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) 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 NFAS
D-channel backup signaling that 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 at the far-end switch.
h. These Error Types are used to report certain error messages received by
the ISDN-PRI Signaling Group for one of its associated B channels. The
aux data field shows for which B channel (port number) the message was
received.
The error code generated equals 3840+x, where "x" is a cause value
defined by the ISDN-PRI Specification. Note that there is no Test to Clear
Value for these Error Types; selected ISDN cause values are placed in the
log when they are received, but no direct action or alarming is performed
solely in response to receiving them. They provide added data that may
prove useful when tracking down obscure networking and routing
problems. The following table provides more information:
555-233-143 Issue 1 May 2002 8-979