Wireless Access

Good summarize! It would be more complete if you can add a third variable to the SNR/Rate chart, that is the distance to the radio.

In simple terms, greater the distance from radio, lesser the RSSI, lesser the SNR. At lower SNR, client switches to slower encoding/decoding mechansim (to reduce frame errors) which results in lower data rates. Click here for more details. Hope this helps !

Hi,

1. Data rate always depends on SNR, SNR depends on two factors 1.Distance from AP 2. Floor noise

2. Client will switch to lower data rate as per the support rate when is see poor SNR

3. To achieve a  particular data rate, it is required to maintain a particular SNR as  shown in the snapshot.

4. RSSI is the signal strength of an AP that a client is seeing currently, Client always use this value to decide whether to roam to other AP or not.

Hope you got some more clarity on this. please feel free for any further clarity on this.

May I know the calculation of the SNR formula? Thanks.

SNR as reported in the various Aruba CLIs is offset from a (static) noise floor of -95, ergo SNR 30 is RSSI -65.