Avaya Media Gateway G350, Руководство по обслуживанию

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Avaya Communication Manager controlled maintenance
ISDN-TRK (DS1 ISDN Trunk)
158 Maintenance of the Avaya G350 Media Gateway
June 2004
Notes:
•
These Error Types indicate a disagreement between this switch and the switch at the other end of
the trunk connection with regard to the ISDN call state of the DS1 ISDN Trunk. This switch will
automatically try to recover by clearing the call, (that is, call will be torn down). You can use the
status trunk group#/member# command to determine the state of the trunk.
When running the Short Test Sequence of tests, pay close attention to the results of the Call State
Audit Test (#257).
•
Software audit error and does not indicate a hardware malfunction. Run the Short Test Sequence
and investigate associated errors.
•
Possible protocol mismatch or far-end may be out-of-service.
Many trunk problems are caused by incorrect settings of parameters on the trunk group
administration form. Settings must be compatible with the local environment and with parameter
settings on the far-end. A DS1 ISDN trunk is a 64 Kbps bearer channel used to transmit digitized
voice or data traffic. These trunks, or B-channels, use a separate channel, the D-channel for call-
control signaling. This mode of operation is known as out-of-band signaling, as opposed to in-
band, robbed-bit signaling, in which signaling is carried in the same channel as the voice or data
traffic. One D-channel, or ISDN signaling link (ISDN-LNK), carries signaling messages for
several B-channels, forming an ISDN signaling group (ISDN-GRP). A B-channel may be a port
on DS1 MM. Two types of DS1 interfaces exist: (1) 24 DS0 channels on a 1.544 Mbps link or (2)
31 DS0 ch 1 framing channel on a 2.048 Mbps link. For additional maintenance
information, see also MG-DS1.
•
The far-end switch changed its ISDN service state to either out-of-service or maintenance. This
may be a temporary condition due to testing of that trunk by the far-end, or a hardware problem
with the trunk. Outgoing calls will not be allowed over the trunk. To investigate the status of the
trunk, use the
status trunk
group#/member# command.
•
This Error Type indicates that the Media Module has been removed or has been insane for more
than 11 minutes. To clear the error, reinsert or replace the Media Module.
•
These Error Types indicate a disagreement between this switch and the switch at the other end of
the trunk connection with regard to the ISDN service state of the DS1 ISDN Trunk. This switch
will automatically try to recover by performing a service state audit. You can use the
status
trunk
group#/member# command to determine the state of the trunk.
When running the Short Test Sequence, pay close attention to the results of the Service State
Audit Test (#256).
•
This trunk is not recognized by the far-end switch. Investigate the trunk administration for both
switches and make changes as necessary.
•
An unexpected SERVICE or SERVICE ACK was received. Possibilities include:
— Translations conflict
— Protocol differences
— ESS may be using NI3 protocol which is not currently implemented in Communication
Manager
— B-channel negotiation problem (glare)
•
This error indicates a failure of the DS1/MM-DS1 Interface Media Module. When running the
Short Test Sequence, the results of the Signaling Link State Check Test (#255) are important.
•
Service State Audit attempt failed (see Test #256). The trunks will not be usable for any outgoing
calls (although incoming calls will be accepted) until the test passes and the trunk state is changed
to in-service (use
status trunk group#/member# to investigate trunk status).