Hello,
I would like to know if there is a Minimum requirement for N and AC as far as transmit rates are concerned. I had heard that there is a requirement of 6 and 24 being active for N to work properly, but I couldn't find anything Aruba related to support that.
I am investigating trasmit rate limitations to facilitate better overall network performance in high capacity situations. We frequently have over 1000 users in a relatively small location, and this has be creating difficulties for throughput, in particular on G Band devices.
Upon doing several tests using a spectrum analyser, I noticed that in particular, where we have an SSID that has limited internet speed (of 10megs), having higher transmit rates was actually creating a severe problem, as the client was staying in the air for a long period of time due to limited internet speeds with increased utilization observed on the spectrum analyser to 80-90% using just one device (on G) for so long as I was doing the test. Meaning that in the air, I was seeing the full rate being used, not just 10megs, despite my speed to the internet being limited.
This got me thinking, that where the internet speed can not match the transmit rates, it is likely better to lower the transmit rate as much as possible to match the maximum speed available via the internet where there is no intranet in use. As we have a throttle for clients of a maximum internet speed of 10megs, I'd like to know if for example, there would be any issue in setting the maximum transmit rate to 12 for this particular SSID or if this would cause connectivity stability issues with N devices. It is used for internet purposes only, and does not allow for any internal communication.
I have tested this with over 1000 users on site with 6 and 24 rates enabled, and have seen a significant improvement in over all capacity, where we would frequently see utilization on high traffic AP's sitting around 80-90%, with the rates lowered, this very rarely occured, and generally speaking utilization never went over 60%, and on far fewer AP's and suspect that in the case where internet is limited to 10megs, being able to lower the rate even further would likely increase performance even further.
Thank you.