Hi all, just looking to compare notes with anyone running 4500 APs with above 20 SMs and passing 120-175 of throughput on AP?
Yes, we have a variety of different e4k AP’s with 20+ SM’s pushing more then 120mbps through them all running 5.12-RC29. Our highest SM count on an e4k AP is 47.
Thank you for your reply, how is your SMs latency/ping? Our e4k APs, with high and low SM count, all have SMs with high ping latency compared to their APs and everything before the APs, ie routers, backhaul radios.
It depends on the AP… some the latency/jitter are OK, some have really bad latency/jitter. We’re working with Cambium to try to determine what is causing these issues. That being said, these latency/jitter issues seems to be related to a higher % of UL packets being sent at low/poor MCS rates.
Here’s an example of an e4k AP that has pretty good latency/jitter across the board for most SM’s:
Here’s an example of an e4k AP that has very high latency/jitter across the board for most SM’s:
Ah I see, okay thank you for your response and insight.
Also, have you noticed any signal/RSSI degradation moving from e3k to e4k and each firmware update?
We haven’t been tracking that. I think that there are too many differences between various e3k and e4k equipment and various firmware revisions that have slightly changed the RSSI/SnR reporting to make that something worthwhile to track. I think tracking modulation and MCS packet %'s is more meaningful.
Understood, thank you. I am a user on the 4500 that we upgraded to 5.12 beta and now I have very poor upload speeds, also websites and web UI load slowly, the moment I updated my 4525 I noticed it instantly.
we have a 4500 with 60 clients hitting 350 Mbps in evenings, latency is trash though.
Thank you for your reply, is that 80mhz channel width? What is your Frames at during the 350mbps peak?
@russ007 @Eric_Ozrelic do you guys have the mu-mimo enabled and how has it been working if so?
I’ve been doing testing with Cambium support on a 4500 AP that saw performance degradation on 5.11+. What I have found so far is that overall performance seems better if AP is on 5.10.4 regardless of if the SMs are on 5.11+.
Not saying performance is perfect as I still see some major TCP vs UDP issues, but the AP on 5.10.4 peforms better.
I would be curious on if you keep the SMs on 5.11 or higher and downgrade just the AP to 5.10.4 what happens to your issue.
We’ve tried all 3 modes, with beamforming disabled, beamforming enabled, and MU-MIMO enabled. Beamforming enabled seems to provide the best latency/jitter. This is most likely due to the additional gain provided allowing higher modulations. When MU-MIMO is enabled, and when it is triggered, beamforming is not used for a single SM and is formed to send data to multiple SM’s, so the system gains are lost and thus lower modulation can occur.
I will definitely check that out, thank you!
So whats the latest verdict with 5.12 vs 5.11? Wait?
It works well, last night hit 170 Mbps on Mu mimo traffic was about 350 - 370
Is it 40MHz channel?
Thanks
If you’re experiencing low individual SM tput on AP’s that are loaded up with lots of SM’s, or you’re experiencing height related GPS issues on the e4k 6GHz platform, then 5.12 is going to significantly help with both of those issues.
If you’re on 5.10.4 and having latency/jitter issues with your SM’,s then 5.12 is not going to help, and it may make things worse.