NEC 151944 Manuale Utente
ND-46550
(E)
CHAPTER
4
Page 67
Revision 2.0
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.
the fault occurrence by lamp indication on DAIA, DAIB, and DAIC cards. For other system faults, refer to the
Maintenance Manual.
shows 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
DAIA card
➀ Reset MB switch.
(Down
→
Up
→
Down)
➁ Check setting of SW1.
1: FP No.1
2: FP No.2
3: FP No.3
0, 4-F: Not used
2: FP No.2
3: FP No.3
0, 4-F: Not used
➂ If fault cannot be cleared,
replace card.
LINK lamp is not on
Layer 2 link connection
failure between DAIA and
DAIB
failure between DAIA and
DAIB
➀ Check whether cable between
DAIA and DAIB is correctly
connected. (Refer to
connected. (Refer to
➁ Reset MB switch.
(Down
→
Up
→
Down)
RED lamp is on
PCM signal loss or Frame
Alignment signal loss
Alignment signal loss
➀ Check whether cable between
DAIA and DAIB is correctly
connected. (Refer to
connected. (Refer to
RMT lamp is on
Remote alarm
➀ Check whether cable between