Avaya G700 Maintenance Manual page 184

6 Avaya MultiVantage Software-Controlled Maintenance:
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 channels + 1 framing channel on a 2.048 Mbps link. For additional maintenance
information, see also DS1-MM.
• (d) 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, issue the status trunk group#/member# command.
• (e) 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.
• (f) 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).
• (g) This trunk is not recognized by the far-end switch. Investigate the trunk administration for both
switches and make changes as necessary.
• (h) 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 MultiVantage
- B-channel negotiation problem (glare)
• (i) 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.
• (j) 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).
• (k) Error Type 3585 appears when the switch receives an ISDN RESTART message for an ISDN
trunk. Calls are cleared with the RESTART message. Therefore, this Error Type may be associated
with a dropped call report from a user.
The following Aux Data values for Error Type 3585 represent the trunk's ISDN call state at the
time the unexpected request to restart the channel was received from the remote switch. This
information can be useful if dropped calls (cutoffs) are reported by users of the ISDN-PRI trunks.
The meanings of Aux Data values are shown below; ignore any others.
184
ISDN-TRK (DS1 ISDN Trunk)
Maintenance for S8300/S8700 and G700
555-234-101 — Issue 2 — October 2002