DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-938ISDN-LNK (ISDN-PRI Signaling Link Port)
9
c. Link error. This error occurs when the port rec eives 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 wh ich the
D-channel resides. If the UDS1 is reporting some errors, then the DS1
facility has experienc ed transmission problems whic h could have cau sed
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, exec ute a long test
sequence for the UDS1 circuit p ack (UDS1-BD). Investigate any errors.
If no errors could be found by testing, the Link Error is probab ly not
affecting service. However, if this Link Error continues to be logged , follow
normal escalation proced ures.
d. UDS1 Interface circuit pac k 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 c ircuit pack is
having problems transmitting data to the Packet Bus, thus affecting the
conveyance of signaling information over the D-channel. Spec ifically, this
error occurs when the Packet Bus transmit bu ffers overflow. This condition
probably indic ates a hardware problem.
The actual alarming level will dep end on the options c hosen via the set
options command on the G3-MT terminal. ISDN-PRI Signaling Link Port
alarms are treated as Station alarms, and their d efault alarming option is to
downgrade all alarms to Warning. The value shown in the preceding tab le
indicates the normal, unfiltered case (option ‘‘y’’ on the set options form).
f. Bad DLCI error. This error occurs when a LAPD frame is received across
the DS1 facility which contains a DLCI whic h does not have a valid entry in
the on-board translation memory. This error normally indic ates an
off-board problem usua lly related to a broken endp oint or a state
mismatch between a remote endp oint and the local c all 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 p ack
detects an overflow of its rec eive buffers. If it occurs freq uently, it may
indicate a LAPD parameter mismatc h between the two end-points of a
packet switched connection. LAPD should be able to recover from this
problem, but it may d egrade the performa nce of the LAN Bus.
Maintenance will not start any testing o r generate any alarms in response
to this error.
h. This error occurs when the
Signaling Port LAN Loopbac k Test (#939)
fails.
Run the long test sequence and pay particular attention to the results of
Test #939.