Troubleshooting ISDN-PRI
Issue 1 May 2002
4-69555-233-143
Troubleshooting ISDN-PRI
The following flow chart defines a layered approach when troubleshooting
ISDN-PRI problems. Since a problem at a lower layer affects upper layers, layers
are investigated from low to high. In the flowchart, the DS1 facility is layer 1, the
ISDN-PRI D channel is layer 2, and the ISDN trunks are layer 3. Transient
problems are diagnosed on Page 2 of the flowchart. For problems with PRI
endpoints (wideband), see the following section.
Figure 4-38. Troubleshooting ISDN PRI (Page 1 of 2)
ARE THERE
ALARMS OR ERRORS
AGAINST UDS1-BD OR
DETERMINE PRESENT STATUS
OF DS-1 FACILITYVIA UDS1-BD
OR DS1-BD MO SECTION.
ARE THERE
ALARMS OR
ERRORS AGAINST
ISDN-LINK OR
ISDN-SGR
IF MULITPLE ALARMS EXIST,
INVESTIGATE IN FOLLOWING
ORDER:
ISDN-LINK
ISDN-SGR
FOLLOW REPAIR PROCEDURE
FOR APPROPRIATE MO
ARE THERE
ALARMS OR
ERRORS AGAINST
FOLLOW REPAIR
PROCEDURE FOR ISDN-TRK
TO
PAGE
2
NO
YES
START
YES
NO
YES
END
A
NO
DS1-BD
ISDN-TRK
FOLLOW REPAIR PROCEDURES
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