On 11/29/07 05:27 am, Ed Durrant thus wrote :

Will Honea wrote:

** Reply to message from "Lewis G Rosenthal"
<os2-wireless_users@2rosenthals.com> on Wed, 28 Nov 2007 21:23:39 -0500

I don't see how there can be "alternatives" to other people jamming noise in the 2.4GHz spectrum, Leon...

Lew, there are some interesting frequency-hopping techniques that work well in
such an environment, although my math says that with the limited number of
channels (11) for target center frequencies even the most elaborate
spread-spectrum techniques become saturated fairly quickly. The problem with
any of it is that most of us don't have military type capability needed to
deploy the really good ones (and the black helicopters would just create more
problems if we tried <g>).

Hey, I'm going to bounce emails for a day or two while I get the hosting and
domain crap straight, so don't cut me off the list, please.

No problem, Will...

Also while "N" is not a certified standard - it could be said that it is the problem not the X-Boxes !

By all accounts the Draft N used by some companies use several frequencies at the same time and that can't be fair in what is a busy spectrum anyway !

Okay, it looks like I should have started a different thread for my comments concerning the Xbox interference. I've corrected that, above.

To recount, and to quote from the article at hand:

One novel problem has been the disruptive interference in the 2.4GHz
band caused by Microsoft Xbox game consoles. Barber and his team
noticed a strange pattern of interference: a strong signal jumping
around all the channels on that band. The team gradually narrowed
the interference down to a few areas in some dorms, and by a process
of elimination focused on game consoles.

To confirm it, Barber brought in his own Xbox from home, plugged it
in, and found the same “very strong, crazy interference” pattern
showing up on the radio-frequency analyzer. “It was even worse with
multiple Xboxes in a given location,” he says. So far MSC hasn’t
come up with a solution. But it was found that shielding the Xboxes
with the antistatic bags used to protect electronic equipment from
electrostatic discharge during assembly and shipping led to a
noticeable drop in interference. It’s probably not a long-term
solution because “that’s not good for the heat [level],” Barber says.

This is not specific to 802.11n, but rather a concern for b and g clients.

Leon, your point about using subchannels is moot when discussing client connections to an AP. Between carrier grade AP's, yes, but I've never seen a client with the ability to use subchannels (and that's not part of the 802.11b or g specs, AFAIK).

The solution is for Microsoft to fix their broken boxes.