A5c (C5x) - 100 mbps

Dear All,
My setup is as follows:
A5c with N5-360 APs (in SRS mode, 80 MHz channel). ver. 2.5.2
Number of client (C5x): 27
Input Internet speed: 400 Mbps
I set my clients on 100 mbps speed plans.
Everyone are not working fine and speed/throughput testing shows these speeds are NOT being attained.
Has anyone else seen issues when using 100 mbps plans using C5x radios connected to an A5c?

Sure there are lots of things that could be slowing you down.

How much speed are you able to get to the C5x devices?

27 clients is a lot to supply 100 Mbps to when you only have 400 Mbps available what are you seeing as the average usage through the A5c?

How far away are you from the clients? How are you doing the bandwidth limiting?

Couple questions to help isolate the issue

Could you post a picture of your Main dashboard of the A5c as well as the Channel & Power Page and Clients page (Both the main “Clients” tab as well as the “PHY Stats” tab)

It could be that there is an issue with the connection between your A5c and the C5x clients. Wireless isn’t quite “magic” or at least there are limitations to the magic of wireless radios. If you can post screen shots of those pages it should be able to confirm if there is an issue with the wireless connection.

Hi @William5!
Thanks for your attention.

No problem.

Ok, so it looks like you kind of have a clean channel as well as are not trying to shoot very far. Both good signs. BTW, cool to see people from all over the world here.

That said, the A5c isn’t reporting to you all of the noise.
As you can see Crystal-Air-01 is picking up noise in the mid -80s which means that it’s signal of -65 isn’t enough for it to get a very high MCS rate (which is the system that radios use to encode data onto a wireless signal, higher MCS, sometimes called QAM, the more information that can be pushed per second) I would guess that the Error Vector Magnitude (EVM) is very high (bad) for this antenna.
Crystal-Air-41, 43 and 47 conversely have slightly better signal to noise ratios and their performance is notably better, even so, I would not suspect that you would be able to get 100 Mbps to those antennas reliably. Even though your A5c is able to talk to them really quickly, it has to spend a lot of it’s time talking slowly to the other antennas. That will limit the total throughput that the A5c can push to any single antenna and particularly the maximum throughput it can push.

I was in a very similar situation, I had lots of clients that have poor connections to my APs and it really hampered the throughput I could push out of my radios. Many many people online were showing much higher speeds through their APs that I couldn’t even get close to duplicating. After years of upgrades and fixing poor connections I have doubled the bandwidth I see being pushed through my APs in many places and I have seen 30-50% improvements in most of the rest of my APs. All this to say, your radios are just handling the situation they have been put into and you can improve it and will see improvements quickly with some pretty simple changes.

The first step I would take would be to make sure each of your radios have a clear Line of Sight to your access point. The goal being to minimize the amount of signal you loose to things blocking or reflecting it around (Making more noise for yourself.) For the distances you are shooting a couple feet around the path of the signal should be enough clearance to be fine.

I am guessing that you are using bare C5x radios without the antenna dishes, my first recommendation would be to get an assortment of the dish sizes and see what you would need to get your signals down into the -50 range or better. You are looking for a Signal to Noise Ratio (SNR) of 27.5 or above. (I like to shoot for -30 because it’s a nice round number and gives me some wiggle room.) If you are already using dishes, then I would recommend going for higher gain dishes which will give you both better signal strengths as well as help to block more of the noise. Too be honest, if you have the budget for it I would have -45 db be your goal for all of your signal strengths, but that could be pretty costly. Probably the best antennas to start working with would be the N5-X12 and N5-16.

Finally, if you really want to maximize the throughput of your AP then I would recommend moving from a 360 degree antenna. The N5-360 is a pretty great antenna, I run it myself, but you have so many directions of noise that you are having to work around. If you have the budget, I would recommend splitting your AP into sectors using either Horn antennas or Mimosa’s own N5-45x2 antennas. The More APs you can split up your coverage into means you can use narrower antenna beam widths which means you will, by default, ignore more noise.

Mimosa has some great documentation as well on the issue:
http://ap.help.mimosa.co/access-point-faq-sensitivity-for-each-mcs-index
http://ap.help.mimosa.co/ap-troubleshooting-guide-low-snr
http://ap.help.mimosa.co/access-point-faq-evm
http://client.help.mimosa.co/client-troubleshooting-guide-low-snr
http://client.help.mimosa.co/client-troubleshooting-guide-high-per
http://client.help.mimosa.co/client-troubleshooting-guide-tx-rx-low-power
http://client.help.mimosa.co/c5x-ptmp-antennas
http://ap.help.mimosa.co/ap-install-a5c-antenna-selections

Thank you @William5 for your answer.
It is good idea to try N5-45x2. I change on weekends.

Can you add the N5-360 and N5-45X2 comparison after the antenna changes?