Operation - Comba Telecom RA-7800 Installation Manual

5 OPERATION

Following installation and commissioning, occasional operation tasks to handle alarms may be
required:
Alarm condition
UL LNA, DL PA
alarms handling
DL Input Power
Overload alarm
handling
Chassis Lock alarm
MCU Battery Fault
Alarm
Optical Transceiver
Alarm
Optical Receiver
Alarm
Equipment Over
Temperature alarm
Power Down / Power
Fault alarm handling
Master-Slave
Monitor Link Alarm
External Alarm 1~4
RA-7800 QI
ENU Status : 1-0-1
INSTALLATION GUIDE FOR RA-7800
Diagnosis
Check power and signal connections of respective modules. If the power
and signal wire connections are OK, then the respective modules may be
faulty. Replace the faulty modules and return it to the factory for repair.
Eliminate alarm by correct setting of DL Input Power Overload threshold. If
the setting is OK but alarm persists, the DL input power might be higher than
the threshold. Increase the attenuator to reduce the input power or replace
the coupler with a new one of high coupling effect. Check the cable
connection of the DT port to the BTS.
Check whether the enclosure door is closed.
Eliminate alarm by correct setting of Monitor battery voltage threshold. If the
setting is OK but alarm persists, the battery pack may be faulty. Replace the
faulty modules and return it to the factory for repair.
The optical TX part of Optical TX/RX Module is faulty. Check and replace the
faulty module and return it to the factory for repair.
The optical power at the RX port of the Optical TX/RX Module is lower than
the minimum requirement, which is resulted by the faulty of the optical TX
part of Optical TX/RX Module or damaged optical fiber link. If so, replace the
optical TX module. If not, check the working status of the optical fiber to
eliminate the alarm.
Eliminate alarm by correct setting of temperature threshold, including normal
and severe. If alarm can not be cleared, apply climatic protection to the
equipment.
Check AC power cable and verify AC mains supply is normal. During Power
Fault alarm, DC power supply has no output. Check if DC output power is
overloaded or short-circuited. The PSU could be faulty.
The communication between the MU and RU is abnormal. Check the
working status of Optical TX/RX Module and FSK.
Check to make sure if the external device connected is working normally
Table 27: Alarms diagnosis
End of Section
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