Maintenance for CSI systems
555-233-119
92
Issue 5 October 2002
Figure 8.
Processing of PRI Endpoint Problems (Page 2 of 2)
Troubleshooting ISDN-PRI Test Call Problems
An ISDN-PRI test call is a diagnostic call placed across an ISDN-PRI
user-network interface to a previously-designated number. An ISDN-PRI test call
is also a maintenance procedure concerned with the identification and verification
ISDN-PRI user-network interface problems. The ISDN-PRI test call can access
ISDN-PRI trunks only.
Perform an in-depth
analysis of DS1
interface between the
switch and the
endpoint equipment,
including the premise
distribution wiring,
endpoint equipment,
and any other noise-
producing equipment.
YES
Are there
bit errors
over the DS1
interface between the
switch and the PRI
Terminal Adapter or
the ISDN endpoint
equipment. Use
‘‘list measurement’’
command.
NO
END
IF THE PROBLEM STILL EXISTS,
THEN ESCALATE
YES
IF PROBLEM STILL
EXISTS, THEN
ESCALATE
NO
FOLLOW REPAIR
PROCEDURE FOR
SYNC MO
Has a
synchronization
source been unstable?
System switching away
from it? Check
for alarms and
errors against
SYNC.
TRANSIENT FAILURES
FROM
PAGE 1
ALWAYS FAIL
CHECK THE HEALTH OF THE
APPLICATION EQUIPMENT
(FOR EXAMPLE, VIDEO CODEC)
AND THE HEALTH OF THE
DEFINITY NETWORK
Does
every
call fail or
are the
failings
transient?
A