11-12-2015 02:11 AM - edited 07-05-2021 04:12 AM
Hello,
Please help me to understand about the effect of interference to the wireless throughput.
By wired, I have 100Mbps download and upload speed. The backbone link connect to Cisco Switch 3850 and down to the Cisco 2960. The Access Point (AP), which is Aironet 3702I, connect to the 2960 switch with Full PoE power (PoE+).
Scenario 1
I tested on less interference environment and the results are attached.
Scenario 2
I tested on crowded interference environment and the results are attached.
I test the throughput by using Speedtest.net with consistent test server (the nearest and reliable server), either on smartphone or laptop.
From the result, what are the possibilites that caused the throughput decrease on scenario 2?
And what should I do to improve the throughput on scenario 2?
Thank you all.
Regards,
Arie.
Solved! Go to Solution.
11-18-2015 10:50 PM
Hi Arie,
There are many factors that influence the throughput speeds of a wireless clients.
There are many more but this a list off the top of my head. At the end of the day your throughput is determined by your Signal-to-Nose Ratio (SNR). The higher the SNR (high signal, low noise) the more throughput you will get out of a client.
I'd use the 5 GHz network where possible, as there are many more channels available for use. You will be less likely to experience interference from your neighbour's APs.
I'd also be more inclined to use a local speedtest server opposed to speedtest.net. This way you can also rule out having to rely on the ISP. iPerf is a simple client/server command line tool that you can run to test throughput on your LAN. There are Android/iPhone utilities that have iPerf built in as well.
You can also use tools like RX-SOP to effectively shrink the size of your AP cell edge (smaller cell sizes) allow more APs to be added in High Density environments to avoid channel overlap, especially on the 2.4 GHz band.
I know this may not have been the answer you were looking for, but should give you a place to start. ~70Mbps is roughly the throughput limit for devices with a single spatial stream and 40mhz support so you could be at your client limits. You'd expect half that if the device only supports 20mhz.
Regards,
Brett Verney
11-18-2015 10:48 PM
Check out this for further reading;
http://wifinigel.blogspot.com.au/2013/03/how-fast-is-my-ipad-on-wifi.html
11-18-2015 10:50 PM
Hi Arie,
There are many factors that influence the throughput speeds of a wireless clients.
There are many more but this a list off the top of my head. At the end of the day your throughput is determined by your Signal-to-Nose Ratio (SNR). The higher the SNR (high signal, low noise) the more throughput you will get out of a client.
I'd use the 5 GHz network where possible, as there are many more channels available for use. You will be less likely to experience interference from your neighbour's APs.
I'd also be more inclined to use a local speedtest server opposed to speedtest.net. This way you can also rule out having to rely on the ISP. iPerf is a simple client/server command line tool that you can run to test throughput on your LAN. There are Android/iPhone utilities that have iPerf built in as well.
You can also use tools like RX-SOP to effectively shrink the size of your AP cell edge (smaller cell sizes) allow more APs to be added in High Density environments to avoid channel overlap, especially on the 2.4 GHz band.
I know this may not have been the answer you were looking for, but should give you a place to start. ~70Mbps is roughly the throughput limit for devices with a single spatial stream and 40mhz support so you could be at your client limits. You'd expect half that if the device only supports 20mhz.
Regards,
Brett Verney
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