NEC NDA-24300 manual How to Check Status LEDs

SYSTEM OPERATIONS

•How to check the STATUS 7-segment LEDs

The ACT/STBY status of CPU can be confirmed by viewing the STATUS 7-segment LEDs. Visually check the LED indications and confirm which CPU is active in your system.

When the STATUS LEDs display any of the two-digit numbers (00 - 99), the belonging CPU is active. If the LEDs display the three letters (S, B and Y) in rotation, the CPU system is in STBY mode. Note that the numbers (00 - 99), displayed on the active CPU front panel (DSP), conform to the percentage points showing CPU occupancy rate.

DSP (Front View)

MBR CPUOPE WDT IMG0

IMG1 IMG2 IMG3

DSP (Front View)

MBR CPUOPE WDT IMG0

IMG1 IMG2 IMG3

1	2	3	4
OFF
1	2	3	4	5	6	7	8
OFF
1	2	3	4	5	6	7	8
OFF

STATUS

	4
2	6
0	C A
E

If the CPU is active, the LEDs here indicate CPU occupancy rate.

1	2	3	4
OFF
1	2	3	4	5	6	7	8
OFF
1	2	3	4	5	6	7	8
OFF

STATUS

2	4	6
0
E	C	A

If the CPU is in ST-BY mode, the left-side LED here goes OFF and the right side beams S, b and y in rotation.

Active ST-BY

Legend
: Lamp is ON	: Lamp is Flashing	: Lamp is OFF

Figure 6-41 How to Check STATUS LEDs

Note: Except for the indication of the STATUS 7-segment LEDs, the ACT/STBY of the CPU also can be con- firmed via the lamps on the DSP. If the CPU OPE lamp light steady-green and IMG0-3 are flashing, the CPU is active. If CPU OPE appears OFF and IMG0 is flashing, the CPU is in STBY mode.

CHAPTER 6 NDA-24300

Page 460

Issue 1