Lucent Technologies lucent ユーザーズマニュアル

Issue 1

August 1997

Routine Maintenance Procedures 

Page 5-58

System Features 

An ISDN-PRI test call is a call of a diagnostic nature that is 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.

NOTE:
An ISDN-PRI test call can be placed only if the circuit translates to an 
ISDN-PRI trunk.

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