140 MN.00273.E - 004
11.2.2 Corrective maintenance (troubleshooting)
Corrective maintenance starts as soon as one or more alarm indication become active.
Corrective maintenance purpose is to locate the faulty unit and replace it with spare after having verified
that the cause of faulty is not external to the equipment.
Corrective maintenance does not include malfunction due to a wrong or incomplete configuration of the
system or to failure due to alarm indication system itself or any other cause external to the system, i.e.:
cabling damage, main voltage loss, antenna misalignment and propagation problems.
See paragraph 11.3
TROUBLESHOOTING for details.
11.3 TROUBLESHOOTING
Main purpose of troubleshooting is to declare an unit faulty or not.
After this step alarms are caused by bad configuration and/or external causes.
11.3.1 Faulty condition detection
Alarms can be pointed out through unit LEDs and/or through SCT/WebLCT software:
Unit LEDs
Near the circular connector of the ODU it’s shown the status of a LED, which can be green or red. The in-
formation provided are:
•Red light
- ON – An internal alarm is active. Connect SCT/WebLCT for troubleshooting.
- Flashing – An external alarm is active.
• Green light
- Flashing – No radio connection with remote ODU. In this case, if remote equipment is on and
properly oriented, it is necessary to evaluate the alarm list with SCT/WebLCT software.
- ON – Radio connection with remote ODU is active.
SCT/WebLCT
Alarms are divided in classes to refer to a particular hardware or software functionality and are character-
ized by their programmable gravity.
A window with alarm classes list is available for local ODU (the unit PC is physically connected to) and for
remote ODU.
The presence of a current alarm is pointed out by SCT/WebLCT program, see software manual.
The presence of an historical alarm is pointed out in the event log window of SCT/WebLCT program (see
Fig.81
and Fig.82).
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