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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 4-1
CARD NAME
PN-DAIA (DAIA) RUN lamp is not flashing Abnormal operation of
LINK lamp is not on
RED lamp is on
RMT lamp is on
shows contents of the fault and the remedial action on each lamp status.
Table 4-1 Remedial Action on Each Lamp Status
LAMP STATUS
DAIA card
Layer 2 link connection
failure between DAIA and
DAIB
PCM signal loss or Frame
Alignment signal loss
Remote alarm
FAULT CONTENT
ND-46550 (E)
REMEDIAL ACTION
Reset MB switch.
(Down→Up→Down)
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.
Check whether cable between
DAIA and DAIB is correctly
connected. (Refer to
Chapter
Section
2.3.)
Reset MB switch.
(Down→Up→Down)
Check whether cable between
DAIA and DAIB is correctly
connected. (Refer to
Chapter
Section
2.3.)
Check whether cable between
DAIA and DAIB (sending side)
is correctly connected. (Refer
to
Chapter
3,
Section
2.3.)
CHAPTER 4
Revision 2.0
3,
3,
Page 67
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