Comba Telecom Ltd. RX-7W22-A Manual De Usuario
INSTALLATION GUIDE FOR RX-7W22
ENU STATUS : 1-0-0
Copyright - refer to title page
Page 51
7.4
APPENDIX D: TROUBLESHOOTING QUICK GUIDE
Alarm list:
DL PA alarm
VSWR alarm
Over Temperature alarm
Low Input alarm
Antenna Malfunction
Dry contact alarm
Shutdown alarm
High input alarm
Signal Booster Failure
Dry contact alarm
LNA alarm
PLL alarm
Figure 46: Alarm list
Troubleshooting:
Alarms
Causes and actions
Low input
(for DT port)
(for DT port)
DT composite input power lower than -80dBm will trigger the alarm
1. Donor antenna/passive system failure
2. Wrong channel frequency setting
3. Site is not commissioned yet
1. Donor antenna/passive system failure
2. Wrong channel frequency setting
3. Site is not commissioned yet
VSWR
Service antenna/passive system failure
Over temperature
Environment temperature shall be lower than 140degF (60degC)
PLL
(Phase lock loop)
(Phase lock loop)
Hardware failure, RMA the equipment
LNA
(Low noise amp.)
(Low noise amp.)
Hardware failure, RMA the equipment
1. Handling RF connectors when RF power is ON may damage LNA
2. High power injection to DT/MT port may damage LNA
1. Handling RF connectors when RF power is ON may damage LNA
2. High power injection to DT/MT port may damage LNA
DL PA
(Downlink amp.)
(Downlink amp.)
Fix any other existing alarms first, then reset PA (see next page)
If alarm still exists, RMA the equipment
If alarm still exists, RMA the equipment
Shutdown
Other critical alarm causes the equipment shutdown
Follow instructions to fix other alarms first
Follow instructions to fix other alarms first
High input
(for DT port)
(for DT port)
Check input power to DT port, the power shall be lower than -30dBm
1. Avoid other inference
2. Put attenuator between antenna and PS BDA, if donor signal is high
1. Avoid other inference
2. Put attenuator between antenna and PS BDA, if donor signal is high