NEC SV8500, Operation And Maintenance Manual

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CHAPTER 5 Operation Procedure for System with PIR
1.5 Replacement Procedure of MUX (Multiplexer) Circuit Card
1.5.1 MUX Replacement: 1-IMG
This section explains the replacement procedure of MUX circuit card (PH-PC36) for 1-
IMG system. MUX circuit card is mounted on PIR 1/2/3 (Slots 13 and 14). TSW card
is mounted on PIR0.
This circuit card is an interface card to accommodate the Line/Trunk circuits. Replacement procedure of
this circuit card is shown below.
Note: Always handle it with care when key setting of the circuit card is to be changed.
Note: MUX card to be replaced must be in STBY mode when the system has speech path in dual configuration.
Use CMOD command to change over the ACT/STBY of the speech path.
[Start]
Note:
Proceed to STEP 6 when TSW card is in single configuration. In this case, MN alarm is generated.
STEP 1 Is the circuit card to be replaced in STBY mode?
Check the MUX ACT lamp on the MUX card. When the lamp is off, the card is STBY mode.
YES: Proceed to STEP 3.
NO: Changeover the TSW ACT to STBY mode by using CMOD command, then proceed to STEP 2.
STEP 2 Confirm the TSW ACT has been changed over normally.
After TSW changeover, check the following lamp indications:
<STBY side>
TSW ACT (TSW card) = off
MUX ACT (MUX card) = off
<ACT side>
TSW ACT (TSW card) = lit (green)
MUX ACT (MUX card) = lit (green)
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required