EQUIPMENT MANUAL FOR RD-9120
RD-9120 QE
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Page 41
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5 OPERATION
Following installation and commissioning, occasional operation tasks to handling alarms may be required:
Alarm condition
Diagnosis
Power down / power fault
alarm
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
overload or short-circuitd. The PSU could be faulty.
UL / DL LNA, UL / DL PA,
UL / DL high / low edge
PLL alarms handling
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 fault modules and return it to the factory for repair.
UL / DL output power low
alarm
Eliminate alarm by correct setting of uplink/downlink power threshold. The
threshold will be indicated when the cursor is positioned to the input field. If
alarm can not be cleared, check the equipment.
Input power low alarm
Eliminate alarm by correct setting of field threshold. The recommended field
threshold is within the range from -80 to -40dBm. If alarm can not be
cleared, check the DT antenna system.
Self-Oscillation alarm
Check whether the Isolation between donor antenna and mobile antenna is
large enough. Adjustment to RX/TX antennas can control self-excited
oscillation. Verify the (I) is 15dB larger than Gmax.
UL / DL VSWR alarm
Check DT antenna system if there is uplink VSWR alarm. Check MT
antenna system if there is downlink VSWR alarm.
Over temperature alarm
Eliminate alarm by correct setting of temperature threshold. If alarm can not
be cleared, apply climatic protection to the equipment
Chassis lock alarm
Close the enclosure door
Table 13: Alarms diagnosis
End of section
