How to fix this alarm "RF UNIT RX CHANNEL RTWP/RSSI Unbalanced "

Experts

Whats the best way to resolve this alarm "RF UNIT RX CHANNEL RTWP/RSSI Unbalanced "

In most cases we dont see any corresponding degradation in site performance but this alarm regularly pops up.

Have tried to change HW - radio, connectors and jumpers but the alarm still come up once in a while

Regards

Dear,

This alarm is may be due to Software conflict installed on BTS

we had a similar situaiton and fixed after RRU change. did you try it?
we also checked many things and sent a ticket to huawei before but finallt it came to hardware end of the day.

There is just one carrier? If you have 2 carries try to load sharing...some cases this alarms happpen in this situation.
Try to change RRU

How about RTWP performance?
If RTWP high this alarm can rise.
However you can check RTWP alarm threshold in M2000

Simply change the jumpers they are faulty...

Quote:

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Originally Posted by djreaper

Simply change the jumpers they are faulty...

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Thanks. Changing cables seems to be working in most cases

there are other posting for this similar issue, please search it.


thanks

Hi, probably you have jumpers crossed between the main and diversity, open the LMT and then go to the monitor tab, and find an option that is called Board RTWP, find the RRU board number and then yo can see if the rtwp between both ports is unbalanced. if the difference is too much you have your jumpers crossed, try discarding first the jumpers coming from antenna , later the filter (if you have) and finally the RRU.

cheers

Quote:

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Originally Posted by brianm

Experts

Whats the best way to resolve this alarm "RF UNIT RX CHANNEL RTWP/RSSI Unbalanced "

In most cases we dont see any corresponding degradation in site performance but this alarm regularly pops up.

Have tried to change HW - radio, connectors and jumpers but the alarm still come up once in a while

Regards

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We have experience this before, found out to be cross jumper installation during cable regrooming activity

Hi there,

These are the following two types of alarms, please follow the handling procedure shown below.

Hope this is what you're looking for.

Regard,


1- RF Unit RX Channel RTWP/RSSI Too Low


Description:
This alarm is reported when the RTWP/RSSI on the RX channel of the RF unit is lower than -114 dBm.

Possible Causes:

The setting of attenuation of the RF unit is incorrect.

The TMA is faulty.

The feeder installation is improper. For example, the feeder connector is loose, soaked or damaged.

The RF unit is faulty.


Handling Procedure:

1-Check the attenuation of the RF unit>>>>>>"check with BO"
2-Reconnect the jumper to the antenna port of the RF unit on site>>>>>>>>"FM task"
3-Reset or Replace the TMA on site>>>>>>>>"FM task"
4-Reset the RF unit on site>>>>>>>>"BO & FM task
5-Replace the RF unit on site>>>>>>>>"FM task"
6-Escalate to RF team to start the frequency scanning test>>>>>>>>"RF team"


2- RF Unit RX Channel RTWP/RSSI unbalance

Description:

This alarm is reported when the difference between the RTWP of the main RX channel and the RTWP of the diversity RX channel exceeds 10 dB.

Possible Causes

The setting of attenuation on the RX channel of the RF unit is incorrect.

External interferences exist on the main or diversity antenna of the RF unit.

The feeder connected to the RF unit is faulty..

Handling Procedure:

1-Check the parameter settings of the RF unit >>>>>>"check with BO"
2-Reconnect the jumper to the antenna port of the RF unit on site >>>>>>>>"FM task"
3-Power off the RF unit on site and then power it on >>>>>>>>"FM task"
4-Escalate to RF team to start the frequency scanning test>>>>>>>>"RF team"