topic 802.11n 2.4Ghz data rate vs connection speed in Wireless

802.11n 2.4Ghz data rate vs connection speed

KevinR99 — Wed, 14 Feb 2024 10:03:24 GMT

I'm trying to understand data rates vs connection speed with a 11n client. In my Cat9800 I have 11Mb/s disabled, 12Mb/s mandatory and 9 and 18-54Mb/s supported.

I have a client connected with 2 spatial streams at 144Mb/s

And in the client details they are connected at MCS rate m15

Am I connected at 36Mb/s and the connection speed with 2 spatial streams is 2 x 36 Tx added to 2 x 36 Rx ?

Is there anywhere that shows the actual rate I am connected at.

Also, the above rates come from the RF tag. If I look in the Radio configuration - Network - 2.4Ghz area I see

What's the difference between that and the RF profile rates of

Thanks as usual for any input.

Kev.

Re: 802.11n 2.4Ghz data rate vs connection speed

jagan.chowdam — Wed, 14 Feb 2024 15:40:59 GMT

Refer https://mcsindex.com/ to understand the expected data rates.

Here is a good article explaining how to read mcs index table - https://wlanprofessionals.com/mcs-table-and-how-to-use-it/

Radio configuration - Network - 2.4Ghz settings are global. These apply to AP with default RF Tag.

However, if you've set up an access point with a customized RF tag (profile), the RF tag settings will supersede the global settings and be applied specifically to that access point.

Jagan Chowdam

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Re: 802.11n 2.4Ghz data rate vs connection speed

Rasika Nayanajith — Wed, 14 Feb 2024 18:05:04 GMT

6,9,12,18,24,36,48,54 Mbps are OFDM rates (knows as legacy data rates) and HT(11n)/VTH(11ac)/HE(11ax) rates are known as MCS (Modulated and Coding Scheme) data rates.

In WiFi you got 3 types of frames
1. Management frames (goes only on primary 20MHz, use one of those legacy rates)
2. Control frames (goes only on primary 20MHz,use one of those legacy rates)
3. Data frames (use bonded channel-20/40/80/160MHz and use one of MCS rates )

If you want to work out rate of a 'data frame' you need to refer that MCS table. Note that your client throughput is much lower than data rate value, which is normal.

HTH
Rasika
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