How to increase the data rate between the AP and the client device in XIQ APs?
What are the configuration settings and radio rates to be given? Also kindly reason them.
Also, compared to the Ethernet, how much percentage of reduction in the data rate can be expected in the wireless? (Client ethernet speed test showed 95 Mbps and wireless speed test showed 35 Mbps).
Best answer by Tomasz
It’s a subject to design, device capabilities, configuration, finetuning to the scenario and current RF characteristics. Sometimes there is room for improvement, sometimes not really.
Datarate is picked by the AP and the STA so it can slightly differ in both directions, also not all traffic is sent with the same datarate. Main decisive factor will be SNR.
For a given datarate, the throughput will likely be around 60-70% of it, but only when single STA is connected to the AP or when others don’t transfer anything. If we have more devices, AP radio throughput becomes something around 40-50% of the datarate on average and this is divided among connected clients. Tough math but we can get a simplified example: 10 STAs 11ac 2x2 40 MHz have datarate of 400 Mbps at most, let’s say they pick that one. We shall get something around 45% of 400 Mbps per AP radio, that is 180 Mbps. This divided by 10 STAs gives 18 Mbps per STA on average. Very good value in vast majority of cases. 25-30 per radio might also be doable but as you can see we can get deep into these different variables ending up only with some statistical assumptions and averages. Of course if we have an office environment, users only need to sync their e-mails from time to time, load a webpage from time to time, so you can see some realistic utilization on the AP radio at hundreds of kbps or single megs on average. Again, this is a subject to capacity design, it will matter how much throughput do we need to assure per STA according to the applications being used. There’s a difference between office WLAN and home WLAN, or between a regular employees WLAN or a WLAN in a company where everyone is literally connected through some HD video calls 24/7.
Perhaps you’d like to take part or look for some recorded Wi-Fi design and best practices webinar with Dave Coleman.
Hope that helps,