4600L/4625 short clean link performance issues at 160mhz

Products ePMP
1

Hello all,

I have a clean 0.6km link I am using for testing a 4625L with a RFE Horn and and 4625 and am noticing my download speeds are very similar on 80mhz and 160mhz.

I am running TDD mode 75/25, very clean and connection, no interference, MCS is DS11 in both directions at all times downlink is (-46 RSSI, SNR of 50) and I am the only client.

I get 500-600Mbps download in 160Mhz channel size and have actually seen just over 600Mbps with a 80Mhz channel size.

Not interested in running WLR mode but that hits 800Mbps+ which is maxing out that particular towers upload limits.

There have been some comments about 160Mhz not being ready for use with TDD yet… If that is the case, How long before I can see closer to 940Mbps…??

Any feedback would be helpful.

Thank you

2

Trying updating to 5.10.4, and try using ePTP mode.

3

Eric,

Thank you for the quick reply.

I am planning to connect more clients and am already running 5.10.4, sorry I was not clear about that in my first post.

4

I do hope Cambium is still working on optimizing 80mhz and 160mhz channel sizes for TDD PtMP. On 40mhz I can easily get almost 400Mbps down, but at 80mhz I usually only see around 600Mbps to a single SM in PtMP TDD 75/25 mode. So double the channel size for only 50% more bandwidth. I know a wider channel will get more noise and will not translate to a 100% increase in performance, but I guess I would expect at least an 70-80% increase over 40mhz.

It could be an issue with the 4625 SM’s processing power as the AP seems to get closer to Cambium’s estimates when doing multi-SM link tests even without MU-MIMO.

This is well below Cambium’s own estimates via the ePMP Capacity Planning Tool which shows 80mhz should be near 800Mbps or more.

ePMP 4k - 80mhz performance bottleneck - Products / ePMP - Cambium Community

5

Ah.. thanks for the information here.

Kind of disappointing, but good to know before I invest a bunch of money into a platform that doesn’t work properly!

6

I wouldn’t say it does not work properly. There are just some improvements they can still make at larger channel sizes.

I am using it for Ptmp and happy with the performance, but realize it can still be better.

7

Well I suppose the 40/80mhz performance is Good/acceptable, but the 160Mhz (Which is why I’m buying) should be advertised as available in a future release.

1 Like
8

When we run F4625’s in 80MHz ePTP mode (for point to point), we can usually get around 800mbps out of them in low latency mode… so they’d probably do closer to 1gbps (maximum of their ethernet interface) in high capacity mode.

9

Eric, ePTP is for Point to Point links only isn’t it?

Derek

10

Yes, ePTP is just for point to point. I only mention it as an example of the radios being capable of pushing near 1gbps.

12

Hi Eric they are talking about Ptmp. For PtP IT works really good