Lucent Technologies lucent ユーザーズマニュアル

Issue 1

August 1997

Routine Maintenance Procedures 

Page 5-56

System Features 

The following flowchart, 

 and 

, defines a layered approach 

when troubleshooting PRI endpoint 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 TN765 Processor Interface is layer 2, and the ISDN 
trunks are layer 3.

PAGE

YES

END

A

FROM

1

ARE

THERE

TRANSIENT

PROBLEMS MAKING

ISDN-PRI

ARE

THERE BIT

ERRORS OVER

HAS A

SYNCHRONIZATION

SOURCE BEEN

SYSTEM SWITCHING

IF PROBLEMS

STILL EXIST,

THEN ESCALATE

COMPARE INDICATED

FACILITY TO RECORD

OF PREVIOUS PROBLEMS

ARE BIT

ERRORS OCCURRING

MORE FREQUENTLY

THAN PREVIOUS

RECORD INDICATED

FACILITY AND, IF THIS

CONTINUES TO OCCUR,

CONTACT FACILITY OR

EXTERNAL EQUIPMENT

THE TI FACILITY?

UNSTABLE?

AWAY FROM IT?

NO

YES

SEE DS1-BD MO FOR

REPAIR PROCEDURES IF

SYNC PROBLEM IS DUE

TO SLIPS. OTHERWISE,

FOLLOW REPAIR

PERFORM AN IN-DEPTH

ANALYSIS OF T1

FACILITY INCLUDING:

TRANSMISSION FACILITY,

EXTERNAL EQUIPMENT

AND ANY OTHER

NOISE-PRODUCING

EQUIPMENT.

REFER TO AT&T PRACTICE

855-351-101 ISSUE 8,

JANUARY 1987. THIS

DESCRIBES T1 CABLING TO

(DACS, CSUs, ETC.,)

CSUs, ETC, IN DETAIL

YES

NO

NO

NO

YES

END

CALLS

SEE SYNC MO

HISTORY

PROVIDER. THEN ESCALATE

PROCEDURES FOR

SYNC MO

USE LIST

MEASUREMENTS

COMMAND