Énfasis Alcatel-Lucent

A.2.38 RADIO_FADING_MARGIN_INSUFF
Description
The RADIO_FADING_MARGIN_INSUFF is an alarm indicating that the mean receive power of the ODUs are lower than the threshold of the receive power (thethreshold value is about thereceiver sensitivity plus 14 dB)

When the receive power of the ODUs in consecutive six hours is lower than the threshold, thesystem reports the alarm. When the meanreceive power of the ODUs becomes normal in threeminutes after the alarm is reported, the alarm clears.

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When you view an alarm on the network management system, select the alarm. In theAlarmDetails field display the related parameters of the alarm. The alarm parameters are in thefollowing format: Alarm Parameters (hex): parameter1 parameter2...parameterN, for example,Alarm Parameters(hex): 0x01 0x08. For details about each parameter, refer to the followingtable.


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Impact on the System
If the MW_LOF or MW_FEC_UNCOR alarm is not generated, services are not affected.Possible Causes

Cause 1: The ODU fault at the transmit end causes abnormal transmit power.
Cause 2: The direction of the antenna is deflected.
Cause 3: Transmission environment changes.
Cause 4:The fading margin in the case of rain and fog in the network planning isinsufficient.


Procedure
Step 1
Cause 1: The ODU fault at the transmit end causes abnormal transmit power.(1)Checkwhether the ODU at the transmit end reports the RADIO_TSL_LOW alarm.

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Step 2
Cause 2: The direction of the antenna is deflected.
 
(1)Check whether the direction of the antenna is deflected[pic]

Step 3

Cause 3: Transmission environment changes.
Check whether the transmission environment changes. For example, check whether any building blocks the transmission and increases the linkfading significantly

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Step 4

f the alarm is reported frequently, contact the network planning department for increasingthe fading margin by replanning the transmission trail
Cause 4:...