Retransmissions when connecting ePMP300-25 to ePMP2000

We had an ePMP3000L / RF Elements 30 Horn setup servicing a rural area that I live in. I am one of the clients and was testing a ePMP300-25 dish with good results. The AP has been damaged during a lightning storm a few days ago so I moved the client radio (my end) onto a ePMP2000 / Cambium sector/ Beam Forming Antenna that also looks over the area and powered the 3000L down.

Retransmissions have now increase to around 50% on the downloadd but only for my Force300-25, the existing Force 200's and 180's that are attached to the AP are not seeing the same issue. There is clear line of site and alignments have not changed. Firmware is 4.4.1 on all devices including the backup firmware on the 3000 and 300.

The image attached shows the power outage in the graph and then continues after I connected to the ePMP2000 4-5 hours later after the power came back on. The signal level has dropped due to less antenna gain at the AP but there are other units with lower receive signals that do not see the retransmits. There is also no other 5Ghz gear around me as I am rural and have no other 5Ghz gear here.

Anyone else seeing this?


@clearstream wrote:

We had an ePMP3000L / RF Elements 30 Horn setup servicing a rural area that I live in. I am one of the clients and was testing a ePMP300-25 dish with good results. The AP has been damaged during a lightning storm a few days ago so I moved the client radio (my end) onto a ePMP2000 / Cambium sector/ Beam Forming Antenna that also looks over the area and powered the 3000L down.

Retransmissions have now increase to around 50% on the downloadd but only for my Force300-25, the existing Force 200's and 180's that are attached to the AP are not seeing the same issue. There is clear line of site and alignments have not changed. Firmware is 4.4.1 on all devices including the backup firmware on the 3000 and 300.

The image attached shows the power outage in the graph and then continues after I connected to the ePMP2000 4-5 hours later after the power came back on. The signal level has dropped due to less antenna gain at the AP but there are other units with lower receive signals that do not see the retransmits. There is also no other 5Ghz gear around me as I am rural and have no other 5Ghz gear here.

Anyone else seeing this?


If you are running 4.4.1 on both ends the only explanation would be some 5GHz collision/interference in your house (WiFi router maybe)? I presume, e2k is running on diferent frequency than e3kl was using. Don't you see anything suspected on you F300-25 spectrum analyser?

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We are seeing the same thing when connecting a F300 to 2000. I will give an example of 2 we replaced. Replaced a F180 and a F200 (both had majority of their modulation at MCS15-14) with F300's . For same RSSI, same frequency, connecting to same AP (2000) we saw modulation rates for download drop from MCS15-14 to MCS13-12 with -0%- modulation at MCS15-14. We also saw that download retrans went from 4-5% with the 180/200 to 22-28% with the 300's. Upload MCS levels and retrans stayed the same. 

The only thing that changed for these installations was a Force 180/200 was traded out for a Force 300 of same form factor (panel or dish). These were extremely rural installations with no neighbors. SOHO routers are R190's at both locations (no 5Ghz). Spectrum analzyer only sees our AP's (2000). 

Even though I only gave an example of 2, -any and all- 300's that we connect to a 2000 AP has reduced download MCS rates for same RSSI as the 180/200 it replaced. We have an AP that used to reach peaks of 75Mbps at 20Mhz width with all F180/200's. Now that we have replaced some of the SM's with 300's same AP reaches peaks of around 60Mbps. Replacing SM's with 300's is forcing me to upgrade AP sooner than I wanted. 

We see SS modulation streams with any 300 connected to a 2000. We barely see any of that with 300's connected to 3000's. 

We have 300's connected to 3000's in urban areas with more noise and same RSSI (around 60-65) with modulation combined around 90% for MCS 8 and 7. There is definitely something the 300's do not like about the 2000 AP's.... or 2000's do not like the 300 SM's. It might be mutual. 

Pics below are for the force 300-16 that replaced a F180 mentioned above. Nothing changed except unit swap. eAlign RSSI is -64. F180 it replaced reached MCS15-14.

I am not complaining, as we planned to replace AP and SM's with 3000/300. I am just confirming what is being seen.