Fault Detection; Figure 2-3 Alarm Indication Routes - NEC NEAX 2000 IVS2 Maintenance Manual

FAULT DETECTION

This section describes the way in which alarm indications are given. If a fault occurs in the
system, you can detect the fault via the routes shown in
ALARM DISPLAY PANEL
PWR
MJ/MN ALARM
INDICATION
MAINTENANCE
PERSONNEL
COMPLAINT FROM
STATION USER OR OPERATOR
(1) Fault Detection by Alarm Indication:
When a fault occurs in the system, you can detect the fault by a Major (MJ) alarm or Minor
(MN) alarm indicated on the AC/DC PWR card or by the external Alarm Display Panel.
(2) Fault Detection by Lamp Indication on Circuit Cards
When a fault occurs in the system, you can detect the fault by lamp indication on circuit
cards, such as a Major (MJ) or Minor (MN) alarm indicated on the MP card.
identifies the alarm indication lamps on each circuit card. For details of lamp indication on
circuit cards, refer to the Installation Procedure Manual.
2
NEAX2000 IVS Maintenance Manual
ND-70926 (E), Issue 3.0

Figure 2-3 Alarm Indication Routes

MJ MN
CHAPTER 2 TROUBLESHOOTING
Figure 2-3.
MJ/MN ALARM
INDICATION
LAMP INDICATION
Fault Detection
PWR CARD
MJ
MN
ON
CIRCUIT CARD
Table 2-2
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