After replacing an epmp3000L with an epmp4500LI’m not seeing very good throughput on the internal speedtest from the AP to any of the clients(worse than it was from the old ap). Their are 8 clients and they are a mix of f300, f200, and 1000 clients. I also have an epmp4500L ap with a single f300 client and the internal speedtest is poor on that as well. I would like to mention that spectrum is clean on both AP’s. Is this a known issue or possibly incorrect readings of the speedtest?
There are some performance issues when using backwards compatibility mode with e1k/legacy N clients to connect to an e4k AP.
If you only enable standard mode (only allowing e3k/e4k clients to connect) does performance improve?
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even in standard mode the speedtests aren’t great
If you look at the radio’s Monitor → Performance page and scroll down to the bottom, what are the majority of MCS %’s that packets are being sent at?
SS3 is the most common with the majority of the packets in the ss2-ss3 range
Having low SS MCS rates is really not good. You may want to double check your rf connectors and cables to make sure that they’re in good shape. You may also want to temporarily use a smaller channel width and try some different channels and see if your modulation improves. If no matter what you try you’re still seeing mostly SS rates, then there may be something wrong with the radio and you should swap it out with a known good working one and try your tests again.
Signal is strong, spectrum is clean, switching the client from an f300 to a 4525 and the 4525 performs well. And I should mention the Uplink from the f300 to the 4500L is quite good. Its just the downlink that doesn’t perform. Maybe a little bit of software tweaking would fix it.
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So when you use an F4525 client, and you watch the MCS %’s… does it show that the majority of packets are being sent at optimal/high DS MCS rates?
yes, 4525 has good rates
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Are you using the newest firmware on all radios… like 5.10.3 or .4?
I’m using 5.10.3 on all radios
Well, I’m out of ideas… I’d suggest you open a ticket with Cambium and their support might be able to help you out.
and (VENT) Cambium has made it so we can’t use 4525s on our existing stable 3000 APs… so instead we either need to keep buying F300’s (which makes no sense) or we need to replace the 3000s we’ve just installed (which makes no sense) and replace then with 4500s which introduces new problems (which also makes no sense), but (/VENT) it’s all cool.
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Hi @Chris_2 ,
Can you please download and share Tech Support Files with me or if you already open a support ticket, please share with me your ticket number so I can investigate your case.
I am finding poor performance on a 4500 with a mix of 4525 and force 300 25 radios. I just installed a customer with a 4525, total users on AP, mix of stated above radios, is 15 and the most I could pull on new installed customer with 4525 was 61 mbps down and 21 mbps up on 20 mhz channel. On my e3K APs, using 20mhz channel, with force 300 25 I was easily hitting 75mbps down and 10 mbps up using 75/25 ratio, hell I even tested one customer with a force 300 25 for fun and he was able to pull close to 100mbps down in link test…..
4525 results….
not really impressed so far but hopefully it gets better. Oh and I am running 5.10.3
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Can you post a screenshot of your stations etc? I only have one 4500L in mixed mode. All my other 4500 series radios are not in mixed mode.
I’m using a 40MHz channel on a 4500L. 5 x F300-25 connected and 3 x F4525L.
TDD, Standard mode, No sync or colo mode. 75/25 5ms. Long guard interval. Asymmetric upload bandwidth.
AP Firmware 5.10.1 . F300-25’s 5.7 & 5.10. F4525L’s 5.10.1
F300-25 Wireless link tests ~ 150Mbps download and / 48Mbps upload (I’d say that’s due to 40MHz upload)
F4525L Wireless link tests ~ 269Mbps download and 38Mbps upload.
Converting these to real world TCP.
Speedtest.net on customer sites I’m seeing up to around 230Mbps. Remote router tests on the F4525L behind LibreQOS shaper
Same remote test on the F300-25
I do see a LOT more retransmissions on the F300-25’s. On the F4525L’s retransmissions are negligible. Stations are all in NAT mode.
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interesting, i don’t know if i mentioned that I am running in flexible mode. I will switch to fixed frame and see if that improves things. I’m kind of intrigued by your upload speedtests since you are seeing higher upload from the legacy gear. Sounds like the developers definitely need to do some tinkering with the software.
I’m kind of intrigued by your upload speedtests since you are seeing higher upload from the legacy gear.
I’ve set the F4525L stations to use asymmetric upload so are only using 20MHz bandwidth on the upload. This keeps their retransmissions low and latency stable. Ideally I wouldn’t have legacy stations and then the 20MHz upload would further reduce interference at the tower.