Software Manual
136 ALFOplus 24GHz (North America) - Release 01.05.0x - MN.00395.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 identify the possible cause of alarm:
• propagations of microwave
- interference (in a link radio turn off the Ptx module (local&remote) and monitoring the Prx during
the day, active local Link ID)
- desalign of antenna (check positions and screws, maximize the voltage AUX connector present
in ODU),
- obstacle in the 1° Fresnel Zone (tree, tower building, etc....)
- using the “Performance Monitoring” Prx, Ptx, BER measuring
- particular condition (heavy rain, stratification of different air temperature, flat surface)
• radio hardware faulty
- alarms due to a wrong configurations or actual status of the radio
- faulty (using embedded radio BER test generator and loops, to check hardware failure)
• external event
- no constant 48 Volt power supply during the day/night
- very high temperature, humidity inside waveguide
- ODU operating range -33°C to +55°C; survival temperature range -40°C to +70°C
- ODU waterproof according to IP65 environmental class
The troubleshooting procedure is performed with:
• check value of power transmitter and receiver
• reading Current Alarms and Alarm History labels and trying to figure out which part of the equip-
ment is affected
• disabled All Manual Operations
• verifying with radio BER test a hardware failure or S/N measure
• verifying the correct initialization of the Local and Remote Radio
•HW restart
• factory default
• firmware update
• replace with a spare part.