NEC SV8500 Operation And Maintenance Manual - page 610
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CHAPTER 5
Operation Procedure for System with PIR
1.7
Replacement Procedure of TSW (Time Division Switch) Circuit Card
This section explains the replacement procedure of the TSW circuit card (PH-SW10-A,
etc.). TSW circuit card is to be mounted on PIR0 (Slot 13 and 14) in case of dual con-
figuration. Replacement procedure of TSW circuit card is shown below.
Note:
Always handle it with care when key setting of the circuit card is to be changed.
Note:
TSW 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.
1.7.1
TSW Replacement: 1-IMG
[Start]
Note:
When the system is in single configuration, stop the system first.
STEP 1
Is the TSW card to be replaced in STBY mode?
Check the TSW ACT lamp on the TSW card. When the lamp is off, the card is in STBY mode.
YES: Proceed to STEP 3.
NO: Changeover the TSW by using CMOD, from ACT to STBY mode, then proceed to STEP 2.
STEP 2
Confirm the TSW has been changed over normally.
After TSW changeover, check the following lamp indications:
TSW ACT (TSW card) = off
MUX ACT (MUX card)= off
TSW ACT (TSW card) = lit (green)
MUX ACT (MUX card) = lit (green)
STEP 3
Turn ON (upward) TSW MBR key on the TSW card of STBY side.
TSW ACT (TSW card) = lit (red)
MUX ACT (MUX card) = off
STEP 4
Turn ON (upward) PLO MB key on the TSW card to be replaced.
STEP 5
Turn ON (upward) MB key on the TSW card to be replaced.
•
M0SY lamp (TSW card) = off
•
SYNC lamp (MUX card) = off
STEP 6
Disconnect MT24 TSW cables from MUX 1, MUX 2, and MUX 3 connectors.
ATTENTION
Contents
Static Sensitive
Handling
Precautions Required