NEC SV8500, Operation And Maintenance Manual

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CHAPTER 2 Operations of SV8500 Server
8.1.6 Manual Changeover of PLO
This section explains how to changeover Phase Lock Oscillator (PLO) card, which can be switched over
independently of Speech Path System.
Changeover of PLO (1-IMG
)
STEP 1 Make sure which PLO is currently placed in ACT mode.
When PLO is active, PLO ACT lamp on the TSW circuit card lights green. If PLO ACT lamp
is off, the PLO is in STBY mode.
Changeover of PLO (1-IMG)
TYPE OPERATIONS REMARKS
Changeover by key operation
- Set PLO MBR key upward on the TSW
whose PLO is placed in ACT.
- Make sure that PLO ACT lamp goes off on
the card, and PLO ACT lamp lights green on
the mate PLO-STBY-TSW card.
- Return TSW MBR key downward on the
key-operated-TSW card.
- PLO ACT lamp goes off when PLO MBR key is set up-
ward on the TSW whose PLO is placed in ACT.
- PLO ACT lamp lights green on the mate PLO-STBY-
TSW card.
Target Cards for Manual System Changeover of PLO (1-IMG)
MODULE
SLOT
NUMBER
CIRCUIT CARD TARGET CARD LOCATION
PIR0
13
TSW
(PH-SW10-A, etc.)
14
TSW
(PH-SW10-A, etc)
Improper key operations may result in a system down. Operate the related keys with extreme
care.
WARNING
Voice calls are not be affected by PLO changeover. However, bit errors may occur on data
lines.
WARNING
13 14
TSW0 TSW1
FANU
PIR0
SV8500 Server