The RSL of the big distance MW link is degrading during the night!

walidnawar · Created Aug 10, 2017 21:48:51

Hello there!

Before replacing any HW, you should ensure whether it's faulty by using the loops.

Please run the full health check for the IF cable, coupler and MW antenna, the isolation of connectors, Also, please guarantee that no LOS or any obstacles are in the route.

Please re-check the Design Parameters ( Path Quality )[[ Configuration of the link ]]

Verify the radio performance to check BER.

Ensure that the IDU gives the needed power for ODU.

Ensure the ODU is earthed properly

Let me share with you some information related to your issue here.

What is the difference between muting & unmutingfor RFU/ ODU?

The difference is thatb in the 'unmute' state, an RFU/ODU can receive and transmit microwave signals. In the 'mute' state, an RFU/ODU can only receive microwave signals because its transmitter does not work.

What is the difference between the RADIO_RSL_LOW and RADIO_RSL_HIGH alarms?

The RADIO_RSL_LOW is an alarm indicating that the radio receive power is very low. This alarm is reported if the detected receive power is equal to or lower than the upper threshold of the RFU/ODU (The upper threshold is –80 dBm for the 112 MHz channel bandwidth and –90 dBm for the other channel bandwidths).

The RADIO_RSL_HIGH is an alarm indicating that the radio receive power is very high. This alarm is reported if the detected receive power is equal to or higher than the upper threshold of the ODU (-20 dBm).

I wish that my participation helped towards solving your issue!

walidnawar · Created Aug 10, 2017 21:48:51

Hello there!

Before replacing any HW, you should ensure whether it's faulty by using the loops.

Please run the full health check for the IF cable, coupler and MW antenna, the isolation of connectors, Also, please guarantee that no LOS or any obstacles are in the route.

Please re-check the Design Parameters ( Path Quality )[[ Configuration of the link ]]

Verify the radio performance to check BER.

Ensure that the IDU gives the needed power for ODU.

Ensure the ODU is earthed properly

Let me share with you some information related to your issue here.

What is the difference between muting & unmutingfor RFU/ ODU?

The difference is thatb in the 'unmute' state, an RFU/ODU can receive and transmit microwave signals. In the 'mute' state, an RFU/ODU can only receive microwave signals because its transmitter does not work.

What is the difference between the RADIO_RSL_LOW and RADIO_RSL_HIGH alarms?

The RADIO_RSL_LOW is an alarm indicating that the radio receive power is very low. This alarm is reported if the detected receive power is equal to or lower than the upper threshold of the RFU/ODU (The upper threshold is –80 dBm for the 112 MHz channel bandwidth and –90 dBm for the other channel bandwidths).

The RADIO_RSL_HIGH is an alarm indicating that the radio receive power is very high. This alarm is reported if the detected receive power is equal to or higher than the upper threshold of the ODU (-20 dBm).

I wish that my participation helped towards solving your issue!

Ramez_Boukaii · Created Aug 11, 2017 06:32:41

Hello dear

Thank for your participatio

Actually all mentioned solutions have been tested but the problem doesn't related to hardware issues, also no extra alarms were generated (only MW_LOF and RADIO_RSL_LOW when the problem occur).

In my opinion, this problem related to LOS. Optical LOS is clear but if we include K value in planning tool the LOS becomes critical as the distance is relatively big, taking into consideration that the RSL reached the planned level when the link work normally!

Thanks

The RSL of the big distance MW link is degrading during the night!

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The RSL of the big distance MW link is degrading during the night!

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