| -----Original Message-----
| From: Guy Harris
|
| I'm not a radio expert, but I think that an 802.11 device can only
| receive on one channel - the manual for Sniffer Wireless
| indicates that
| it implements a "channel surfing" mode, but in that mode it appears to
| listen on a given channel for some number of seconds, and
| then switch to
| the next enabled channel and listen on that for some number
| of seconds,
| and so on - if you've configured it to look for a particular BSSID,
| it'll stop if it detects that BSSID on a given channel and will, I
| infer, capture traffic on that channel. You can also specify "trigger
| events" (particular types of packets to look for) and, if it gets a
| trigger event in channel surfing mode, it'll capture on the channel on
| which it saw that packet. That seems to imply that you can
| only capture traffic on one channel at a time.
|
| (I don't know whether that's an intrinsic limitation of
| 802.11; it might
| be possible to have an 802.11 card that taps multiple
| channels, although
| that card might require multiple DSPs to handle multiple channels. I
| suspect no cards do so.)
I suspect the "boosted" 802.11 equipment providing multiples of 11Mbps
from using more than one channel at a time.
Regards,
Olivier