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CHAPTER 2 NDA-24300
Page 26
Issue 1
SYSTEM MAINTENANCE OUTLINE
• PM (Line/Trunk Card) Make-Busy Restart
In this processing, the faulty PM (Line/Trunk Card) is isolated from the system and, at the same time,
the calls associated with that faulty PM (Line/Trunk Card) are released. No calls related to the faulty
PM (Line/Trunk Card) are processed and the system normally runs without the faulty PM (Line/Trunk
Card).
• Data Copy Restart
In a system of dual CPU configuration, the RAM memory (including the data memory) is copied from
the ACT side CPU into the STBY side CPU, and ACT/STBY is changed over and monitor restart is
executed.
In the case of this restart processing, only the ACT side CPU and the STBY side CPU are changed
over without any effect on the current connections. However, no call processings are executed while
the restart processing is in progress (from copying until the end of the changeover).
3. HOW TO READ PRECAUTIONS, DIAGNOSTIC, AND FAULT REPAIR INFORMATION
3.1 Precaution about Diagnostic Procedure/Fault Repair Procedure
When performing diagnostic procedures/fault repair procedures, always adhere to the following actions:
(1) When replacing a circuit card with a spare, handle the circuit card using the Field Service Kit.
(a) To protect the circuit card from static electricity, wear a wrist strap before handling the circuit card.
(b) Before extracting the circuit card from its mounting slot, set its MB switch to the UP side (ON).
(2) When holding a circuit card by hand, wear gloves and be careful not to touch mounted parts, gold-plated
terminal, etc., on the circuit card.
The 3M
Model 8012 Portable Field Service Kit, shown in Figure 2-19, is recommended as an effective
countermeasure against static electricity.
Table 2-2 Kinds of Circuit Card Front Restart
SENSE (0~F) KIND OF RESTART REMARKS
1 DM Clear Restart
2 DM Load Restart When the system is in operation
5 OAI Memory Clear Restart
C OFF-line Restart