User's Manual

CrossFire HP – All-Digital Transport System

User Guide

9. Device Maintenance

9.1. Regular Maintenance

When the CrossFire is running, regular inspection is recommended, as follows:

1. Check that RF and power cables are connected securely and that all screws are tight. If any connections pose a

safety hazard, deal with them as soon as possible.

2. Check the ground status of the device.

3. Measure the power supply voltage of the devices.

4. Check the operating status and main performance parameters of devices regularly through the NMS or OMT.

5. Check whether all warning marks are intact.

If a fault occurs and the device cannot operate normally, return the device to the factory for repair or send to

technicians for site repair.

9.2. Troubleshooting

This section lists problems that may arise in engineering applications and suggests relevant solutions.

1. The slave device cannot synchronize with the master device:

a) Query the software version using the OMT. Make sure that the device is running the correct software.

b) Check the SFP module to confirm whether the SFP module has been damaged.

c) Restart the device. If the problem persists, the device may have been damaged. The equipment needs to

be replaced.

2. RU downlink shows an output-power alarm:

a) The gain of the RU downlink is equal to (37- DL attenuation dB). Check the RU downlink baseband power,

and then add the downlink baseband power to the RU downlink gain. The result should be close to the

output power. If the deviation is more than 5 dB, the PA module may be damaged.

3. Over-temperature alarm:

a) The devices need space to dissipate heat. Ensure the device is not covered by anything. If the device is

covered, the temperature will rise.