Avaya Definity SI Maintenance Manual page 1771

ISDN-TRK (DS1 ISDN Trunk)
When running the Short Test Sequence of tests, pay close attention to the
results of the Call State Audit Test (#257).
b. This is a software audit error that does not indicate any hardware
malfunction. Run the Short Test Sequence and investigate associated
errors (if any).
c. Possible protocol mismatch or far-end may be out-of-service.
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 status trunk <trunk_group/trunk_member>.
e. This error type indicates that the circuit pack has been removed or has
been insane for more than 11 minutes. To clear the error, reinsert or
replace the circuit pack.
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 status trunk
<trunk_group/trunk_member> 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.
555-233-123
NOTE:
Many truck 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. The general term DS1 circuit pack refers to TN464 and
TN767 series circuit packs. 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 either a TN464 series
UDS1 circuit pack or a TN767 series DS1 Interface circuit pack. 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
Interface Circuit Pack)''
Interface Circuit Pack)''
for TN767 ports and ''UDS1-BD (UDS1
for TN464C/D ports.
Issue 4 May 2002
''DS1-BD (DS1
10-985