CHAPTER 4 TROUBLESHOOTING

This chapter describes the method for fault diagnosis and troubleshooting when maintenance personnel detected the fault occurrence by lamp indication on DAIA, DAIB, and DAIC cards. For other system faults, refer to the Maintenance Manual. Table 4-1shows contents of the fault and the remedial action on each lamp status.

Table 4-1 Remedial Action on Each Lamp Status

CARD NAME

LAMP STATUS

FAULT CONTENT

 

REMEDIAL ACTION

 

 

 

 

 

PN-DAIA (DAIA)

RUN lamp is not flashing

Abnormal operation of

Reset MB switch.

 

 

DAIA card

 

(DownUpDown)

 

 

 

Check setting of SW1.

 

 

 

 

1: FP No.1

 

 

 

 

2: FP No.2

 

 

 

 

3: FP No.3

 

 

 

 

0, 4-F: Not used

 

 

 

If fault cannot be cleared,

 

 

 

 

replace card.

 

LINK lamp is not on

Layer 2 link connection

Check whether cable between

 

 

failure between DAIA and

 

DAIA and DAIB is correctly

 

 

DAIB

 

connected. (Refer to Chapter 3,

 

 

 

 

Section 2.3.)

 

 

 

Reset MB switch.

 

 

 

 

(DownUpDown)

 

RED lamp is on

PCM signal loss or Frame

Check whether cable between

 

 

Alignment signal loss

 

DAIA and DAIB is correctly

 

 

 

 

connected. (Refer to Chapter 3,

 

 

 

 

Section 2.3.)

 

RMT lamp is on

Remote alarm

Check whether cable between

 

 

 

 

DAIA and DAIB (sending side)

 

 

 

 

is correctly connected. (Refer

 

 

 

 

to Chapter 3, Section 2.3.)

ND-46550 (E)CHAPTER 4

Page 67

Revision 2.0

Page 75
Image 75
NEC 151944 system manual Remedial Action on Each Lamp Status, PN-DAIA Daia, Daib