555-233-119
1312
Issue 5 October 2002
Notes:
a. 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, the call will be torn down). You can use the status
trunk <trunk_group/trunk_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).
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.
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 ch 1 framing channel on a 2.048 Mbps
link. For additional maintenance information, see also
‘‘DS1-BD (DS1
Interface Circuit Pack)’’
for TN767 ports and
‘‘UDS1-BD (UDS1
Interface Circuit Pack)’’
for TN464C/D ports.