User's Manual

Appendices
E1 Spread Spectrum Radios
10-19
Step4.1: Perform IF loopback to check if IDU works well or not. If IF loopback is error-free, then IDU must
be ok.
Step4.2: Perform RF loopback to check if ODU works well or not. IF RF loopback is error-free, then ODU
must be ok.
Step4.3: Perform the same loopback on the other sites to check if the status of the other site.
Step5: If you have spare parts for system or antennas, try to replace equipment one by one to verify the
problem. If any of the equipments fails, then contact us to start RMA procedure.
Step6: Shorten the distance between two sites to about 500 meters or connect antenna port to each other with
physical cable and about 50 attenuation loss. This is to verify the system status in short distance. If the system
fails with this topology, then the antenna or RF cable must be defective.
Step7: Recalculate link budget by the method of section 10.8. If the link budget is lower than standard, then
please reduce the system loss or increase the gain of antenna.
10.9.2 Establish a Link but Poor Performance
If E1 radios display green light on the IDU but with lots of error occurred, please find the following steps for
troubleshooting.
Step1: Check the Rx LED on the ODU or Rx/Tx reading on the IDU. We suggest that if the Rx reading is lower
than -60dB, then it has great possibility that you encounter RF problem. You could take following measures in
order to verify the situation.
Step1.1: There is possibility of wrong antenna angel toward each other. Please adjust your antennas to
the correct angle.
Step1.2: There is possibility of air interference. Please switch your RF channel to another available one
of both sites.
Step1.3: There is possibility of poor link budget. Please reduce the system loss or increase the gain of
antenna.
Step2: Check if some loopback tests have been performed then.
Step3: Please conduct loopback tests to verify if the system is broken or not by following order. Please refer to
section 5.2.3 and section 8.2.13 for detail operation. If any of the following items fails, then contact us to start
RMA procedure.
Step3.1: Perform IF loopback to check if IDU works well or not. If IF loopback is error-free, then IDU must
be ok.
Step3.2: Perform RF loopback to check if ODU works well or not. IF RF loopback is error-free, then ODU
must be ok.
Step3.3: Perform the same loopback on the other sites to check if the status of the other site.