Wireless Video Freezing Throughput Wavy Character - Advice?

So all 23 cameras experience the same exact issue? 

If thats the case I’d start investigating at the headend where both Lite Beams are terminated and if unplugging one unit (and associated cams) causes the issue to stop.

When you said its steady/cyclic, what is the period of time between freezing? Are you able to be on site while its happening? Finding wireless interference, or troubleshooting wireless issues is much easier when it is repeatable and happening while on site.

When you say the streams freeze, does it just sit on a key frame? or do you see h264 artifacts (smearing of motion, etc)?

Thank you for your responses.

Here's what it looks like. The horizontal grid spacing is 10 sec and vertical is 100Mbps (the whole graph is 1Gbps).  

When the video freezes it stays on a frame (sometimes no connection message comes up) - no artifacts.

Do the Litebeams have a spectrum analyzer graph, so you can see how crowded the Wi-Fi spectrum is? Are the Litebeams installed within 5-6 feet of each other? What is your channel width (10,20,40,80 MHz)?

This is an apartment complex and when I survey the wifi here I see literally around 100 5GHz networks. My 2 Litebeams are on the least crowded that is not occupied by any wifi. Here's an Airview snapshot:

One Litebeam works on 5310(DFS) and another on 5270(DFS). Both with channel width of 40MHz. The Ambient Noise Level graph shows that area in mostly red which I'm guessing is generated by all the Litebeams' traffic.

The Litebeams are installed back-to-back.

I've just separated the center frequencies to see how this would change. The network graph stayed pretty much the same just the peaks slightly lower. Then I restarted one of the antennas and the graph stayed the same but peaks were lower. That hints me towards the conclusion. If one of the antennas is down and the peaks/valleys are pretty much in the same spots on the time axis this may mean the the RF network is not at fault unless there's a regular interference that affects both antennas at the same time. Maybe the issue is related to the network switch that Litebeams connect to or the server itself?

I've replaced the switch and still same is happening.

So when you say they're installed back to back, you mean literally inches from each other? Did you try completely powering down one of the radios (unplug it), or just restarting? Restarting may only stop transmission for a few seconds. Even if they're on different channels, you'll want 3-6 feet of separation between antennas

Hey Sean,

I think you got it right although not 100% confirmed. This was definitely an issue with Litebeams. I replaced both of them with Rocket and omni antenna and everything started to work flawlessly. Thanks a lot for your help!

Hey Sean,

I had two different SSIDs for the Litebeams. Just wanted to mention also during the troubleshooting I disconnected one AP from the PoE injector to see if there was any interference between the Litebeams. Even with only one Litebeam turned on I had the same issue just lower peaks on the network throughput graph. Very puzzling.

At the end of the day I took a Rocket with an omni antenna and installed it right next to the Litebeams. The rest of the configuration I did remotely from home. I connected half of the Nanobeams to Rocket and turned the Litebeams in to stations so they wouldn't behave like hosts anymore. At this point with half of the Nanobeams connected to the Rocket the throughput was stable. I ditched the Litebeams and connected everything to the Rocket and all works fine now.

I would be nice to know why this was happening. If I find time I'll play with it in our lab.

Thanks for all your help.