NEC SV8500 Operation And Maintenance Manual - 7-V:

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CHAPTER 3

System Messages

7-V:

PLO MB Key Turn OFF

This message displays when the MB switch on the PLO card is turned off while extracting or inserting a circuit

card

.

Faulty PLO card number

Status of PLO card at the time of 

failure detection (Scan Data 1)

Status of PLO card at the time of 

failure detection (Scan Data 2)

Default Alarm

Default Grade

Grade Modified

Lamp Modified

NON

3

1:

XXXX

XX00

0000

0000

2:

0000

0000

0000

0000

3:

0000

0000

0000

0000

4:

0000

0000

0000

0000

5:

0000

0000

0000

0000

6:

0000

0000

0000

0000

7:

0000

0000

0000

0000

8:

0000

0000

0000

0000

9:

0000

0000

0000

0000

b7

b0

b7

b6

b5

b4

b3

b2

b1

b0

b7

b4

b1

b0

1 2

3

b0:

0/1 = PLO System 0/PLO System 1

1

b0:

0/1 = Clock STBY/ACT

b1:

0/1 = PLO Synchronizing/PLO self-running or drifting

b2:

0/1 = -/Input clock down

b3, b4: Route of Input clock (see table)

b5:

0/1 = -/PLO input all down

b6:

0/1 = -/PLO output down

b7:

0/1 = -/Drifting

b4 b3

CONNECTIED WITH PRIMARY 

OSCILLATOR (M-OSC)

CONNECTED WITH 

EXTERNAL CLOCK

0

0

M-OSC  0

Route  0

0

1

M-OSC  1

Route  1

1

0

-

Route  2

1

1

-

Route  3

2

b0:

0/1 = -/n 

u

five millisecond clock down

b1:

0/1 = -/Frame Synchronization down from SYNC card

b4:

0/1 = -/Internal OSC clock down 

3