Avaya S8700 Maintenance Manual page 1689

ISDN-PLK (ISDN-PRI Signaling Link Port)
c. Link error. This error occurs when the port receives an invalid frame over
the D channel. This error normally indicates an off-board problem usually
related to transmission errors on the DS1 facility. Execute list
measurements ds1-log for the UDS1 TN464 circuit pack on which the
D channel resides. If the UDS1 is reporting some errors, then the DS1
facility has experienced transmission problems that could have caused the
ISDN-LNK to report a Link Error.
If the UDS1 is not reporting errors, execute the long test sequence for the
D channel. Investigate any errors. If there are none, execute a long test
sequence for the UDS1 circuit pack (UDS1-BD). Investigate any errors.
If no errors could be found by testing, the Link Error is probably not
affecting service. However, if this Link Error continues to be logged, follow
normal escalation procedures.
d. UDS1 Interface circuit pack is out of service. Look for and resolve
UDS1-BD errors in the Hardware Error Log.
e. Transmit FIFO Overflow error. This error indicates that the circuit pack is
having problems transmitting data to the packet bus, thus affecting the
conveyance of signaling information over the D channel. Specifically, this
error occurs when the packet-bus transmit buffers overflow. This condition
probably indicates a hardware problem.
The actual alarming level will depend on the options chosen via the set
options command on the G3-MT terminal. ISDN-PRI Signaling Link Port
alarms are treated as Station alarms, and their default alarming option is to
downgrade every alarm to Warning. The value shown in the preceding
table indicates the normal, unfiltered case (option "y" on the set options
form).
f. Bad DLCI error. This error occurs when a LAP-D frame is received across
the DS1 facility that contains a DLCI that does not have a valid entry in the
on-board translation memory. This error normally indicates an off-board
problem usually related to a broken endpoint or a state mismatch between
a remote endpoint and the local call-processing software. Maintenance will
not start any testing or generate any alarms in response to this error.
g. Receive FIFO Overflow error. This error occurs when the circuit pack
detects an overflow of its receive buffers. If it occurs frequently, it may
indicate a LAP-D parameter mismatch between the two endpoints of a
packet-switched connection. LAP-D should be able to recover from this
problem, but it may degrade the performance of the LAN bus.
Maintenance will not start any testing or generate any alarms in response
to this error.
h. This error occurs when the Signaling Port LAN Loop-Back test (#939) fails.
Run the long test sequence and pay particular attention to the results of
Test #939.
555-233-143 Issue 1 May 2002 8-967