NEC SV8500, Operation And Maintenance Manual

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CHAPTER 5 Operation Procedure for System with PIR
STEP 15 Turn OFF the MB key on the new MUX card.
• M1SY, M2SY and M3SY lamps (TSW card) = lit (green) (depending on the number of PIR)
• MUXACT lamp (new MUX card) = remains off
STEP 16 If PLO MB key on the TSW card is set to ON, turn it OFF.
Note:
PLOACT #0 has higher priority than PLOACT #1. Therefore, PLOACT #0 is automatically set as ACT
when the TSW MB key is turned ON/OFF while the PLO MB key of TSW #0 is OFF.
STEP 17 Turn OFF (down) the MBR key on the TSW card.
• TSWACT lamp (TSW card) = off
STEP 18 Execute the TSW ACT/STBY changeover by using CMOD command and confirm the new
MUX card is operating normally.
[End]
1.5.2 MUX Replacement: 4-IMG
MUX circuit card is mounted on each PIR. This circuit card is an interface card to accommodate the Line/
Trunk circuits. Replacement procedure of this circuit card is shown below.
[Start]
Note: Proceed to STEP 3 when speech path 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
OPE/MB (DLKC card) = off
MUX ACT (MUX card) = off
<ACT side>
TSW ACT (TSW card) = lit (green)
OPE/MB (DLKC card) = lit (green)
MUX ACT (MUX card) = lit (green)