NEC 2400IMX system manual Fault Recovery Procedure

SYSTEM MAINTENANCE

4.2.2BAD CALL NOTIFICATION

Perform the diagnostic work followed by “System Operations and Maintenance Manual”.

5. FAULT RECOVERY PROCEDURE

5.1 BEFORE STARTING FAULT RECOVERY

After the fault diagnostics based on fault information such as the alarm and system messages, the next procedure to be done is the fault recovery. Before proceeding to this, it is required to examine when it should be started by comparing the emergency of repair and its influences. Particularly, when the fault is determined in the ST-BY system, the work should be done at night when the ACD system is operated less frequently. The fault recovery procedures can be divided into those on the ACD system and those on the MIS, as shown below.

Fault information Collection
Section 4.2, “Diagnostics from System Messages”
ACD System Fault Recovery –See Section 5.2	MIS Fault Recovery – See Section 5.3

Figure 9-4 Flow of Fault Recovery Procedures

5.2 ACD SYSTEM FAULT RECOVERY PROCEDURES

See the “NEAX2400 IMX System Operations and Maintenance Manual” for the fault recovery procedure related to the ACD system shown below.

1.ACDP of Fault - Fault occurs intermittently at ACT side

2.ACDP of Fault - ST-BY side is faulty

NDA-24282 (E) CHAPTER 9

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