Re: [Ethereal-users] wifi frame "Supported rates" meaning

[Guy Harris <gharris@xxxxxxxxx>]

PoWah Wong wrote:
> I captured some 802.11 frames with ethereal.
> What is the meaning of (B) in "Supported rates"?

To quote ANSI/IEEE Std 802.11, 1999 Edition, section 7.3.2.2 "Supported 
Rates element":

	Within Beacon, Probe Response, Association Response, and Reassociation 
Response management frames, each supported rate belonging to the 
BSSBasicRateSet, as defined in 10.3.10.1, is encoded as an octet with 
the msb (bit 7) set to 1 (e.g., a 1 Mbit/s rate belonging to the 
BSSBasicRateSet is encoded as X'82'). Rates not belonging to the 
BSSBasicRateSet are encoded with the msb set to 0 (e.g., a 2 Mbit/s rate 
not belonging to the BSSBasicRate Set is encoded as X'04'). The msb of 
each Supported Rate octet in other management frame types is ignored by 
receiving STAs.

Rates in the BSSBasicRateSet are tagged with (B).

To get copies of 802.x standards online, see

	http://standards.ieee.org/getieee802/index.html