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New Member
Posts: 30
Registered: ‎01-03-2014
Kudos: 6

Weird Interference

Hey,

 

I have a weird kind of interference / problem which I can't seem to debug.

 

Setup:

Each site has a PBE-5AC-300 connected to an EdgeRouter X SFP. Frequency seems to be clear in AirView.

 

rf01.png

 

Symtpoms:

 

Traffic stops passing for ~5-10sec every now and then (e.g. in iperf from edgerouters behind the PowerBeams, expland spoiler to see example iperf log)

Spoiler
[ 4] 0.00-1.00 sec 9.88 MBytes 82.8 Mbits/sec 0
[ 4] 1.00-2.00 sec 11.5 MBytes 96.4 Mbits/sec 0
[ 4] 2.00-3.00 sec 10.6 MBytes 89.1 Mbits/sec 0
[ 4] 3.00-4.03 sec 11.4 MBytes 93.1 Mbits/sec 0
[ 4] 4.03-5.00 sec 11.0 MBytes 94.7 Mbits/sec 0
[ 4] 5.00-6.00 sec 11.2 MBytes 94.3 Mbits/sec 0
[ 4] 6.00-7.00 sec 11.0 MBytes 92.3 Mbits/sec 0
[ 4] 7.00-8.00 sec 11.1 MBytes 93.3 Mbits/sec 0
[ 4] 8.00-9.00 sec 11.0 MBytes 92.3 Mbits/sec 0
[ 4] 9.00-10.00 sec 11.0 MBytes 92.3 Mbits/sec 0
[ 4] 10.00-11.03 sec 11.2 MBytes 91.9 Mbits/sec 0
[ 4] 11.03-12.02 sec 11.0 MBytes 93.0 Mbits/sec 0
[ 4] 12.02-13.03 sec 11.2 MBytes 93.7 Mbits/sec 0
[ 4] 13.03-14.03 sec 11.1 MBytes 93.0 Mbits/sec 0
[ 4] 14.03-15.00 sec 11.1 MBytes 96.0 Mbits/sec 0
[ 4] 15.00-16.00 sec 11.1 MBytes 93.4 Mbits/sec 0
[ 4] 16.00-17.03 sec 11.1 MBytes 91.0 Mbits/sec 0
[ 4] 17.03-20.77 sec 1.25 MBytes 2.80 Mbits/sec 4
[ 4] 20.77-20.77 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 20.77-20.77 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 20.77-21.04 sec 2.88 MBytes 92.1 Mbits/sec 0
[ 4] 21.04-22.00 sec 11.1 MBytes 96.5 Mbits/sec 0
[ 4] 22.00-23.00 sec 11.1 MBytes 93.3 Mbits/sec 0
[ 4] 23.00-24.03 sec 11.2 MBytes 92.1 Mbits/sec 0
[ 4] 24.03-25.02 sec 10.6 MBytes 89.5 Mbits/sec 0
[ 4] 25.02-26.00 sec 9.25 MBytes 79.2 Mbits/sec 0
[ 4] 26.00-27.00 sec 9.62 MBytes 80.8 Mbits/sec 0
[ 4] 27.00-28.00 sec 10.4 MBytes 87.0 Mbits/sec 0
[ 4] 28.00-29.03 sec 10.0 MBytes 81.7 Mbits/sec 0
[ 4] 29.03-45.94 sec 8.50 MBytes 4.22 Mbits/sec 6
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 2
[ 4] 45.94-45.94 sec 0.00 Bytes 0.00 bits/sec 5
[ 4] 45.94-46.03 sec 1.00 MBytes 92.2 Mbits/sec 15
[ 4] 46.03-47.00 sec 11.0 MBytes 95.2 Mbits/sec 0
[ 4] 47.00-48.00 sec 11.1 MBytes 93.4 Mbits/sec 0
[ 4] 48.00-49.00 sec 11.1 MBytes 93.3 Mbits/sec 0
[ 4] 49.00-50.03 sec 11.2 MBytes 91.8 Mbits/sec 0
[ 4] 50.03-51.03 sec 11.1 MBytes 93.1 Mbits/sec 0
[ 4] 51.03-52.00 sec 10.9 MBytes 94.1 Mbits/sec 0
[ 4] 52.00-53.00 sec 10.8 MBytes 90.2 Mbits/sec 0
[ 4] 53.00-54.00 sec 11.1 MBytes 93.2 Mbits/sec 0
[ 4] 54.00-55.00 sec 11.1 MBytes 93.4 Mbits/sec 0
[ 4] 55.00-56.03 sec 10.4 MBytes 84.3 Mbits/sec 0
[ 4] 56.03-57.05 sec 8.88 MBytes 72.9 Mbits/sec 0
[ 4] 57.05-61.55 sec 7.88 MBytes 14.7 Mbits/sec 4
[ 4] 61.55-61.55 sec 0.00 Bytes 0.00 bits/sec 0
[ 4] 61.55-61.55 sec 0.00 Bytes 0.00 bits/sec 0
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-61.55 sec 411 MBytes 56.1 Mbits/sec 36 sender
[ 4] 0.00-61.55 sec 411 MBytes 56.0 Mbits/sec receiver

Is there anything I can try to see what the problem is?

 

No other links on the local site seems to be having such problems, the remote site does have a few 3G/LTE cells closeby but they should not operate on 5.xGHz (and in my opinion should cause more consitent problems and not a ~5-10sec complete stop).

SuperUser
Posts: 20,320
Registered: ‎09-17-2013
Kudos: 5085
Solutions: 1448

Re: Weird Interference

What's the link passing over / through?  trees, a road, etc?

New Member
Posts: 30
Registered: ‎01-03-2014
Kudos: 6

Re: Weird Interference

The link is passing through the city (each end on a building which is quite a bit higher than the surrounding buildings).

 

I don't think the environment is the problem (no moving trees nearby and bigger object would cause permanent effects and not these weird drops).

SuperUser
Posts: 20,320
Registered: ‎09-17-2013
Kudos: 5085
Solutions: 1448

Re: Weird Interference

not if your 'nearby large object' was only partially obstructing the fresnel zone.  Check the shot in airlink (remember that that only shows the ground height), and then if anything looks iffy from a satellite view, something like google earth can get you a 3d view to see if the LOS hits any buildings or the like

Ubiquiti Employee
Posts: 8,148
Registered: ‎04-14-2017
Kudos: 1565
Solutions: 225

Re: Weird Interference

What is this bigger object and how much of the fresnel zone does it impede on?
Senior Member
Posts: 2,927
Registered: ‎07-17-2010
Kudos: 651
Solutions: 165

Re: Weird Interference

Likely another radio on frequency is transmitting random data.

 

Try other frequencies.

New Member
Posts: 30
Registered: ‎01-03-2014
Kudos: 6

Re: Weird Interference

I need to check the panorame shots we did, but I don't think there are any bigger objects in the way.

 

I have another Idea: it might be the quite old elevator with the engines quite close to where we have the EdgeRouter powering the PowerBeams. I will probably have to go to the site and keep an iperf or ping running while watching the elevator.

Ubiquiti Employee
Posts: 8,148
Registered: ‎04-14-2017
Kudos: 1565
Solutions: 225

Re: Weird Interference

You are thinking it's electrical noise from the elevator? I think it's more likely to be interference or fresnel zone intrusion.
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