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Date: Thu, 29 Nov 2007 17:32:50 -0500
From: "Leon D. Zetekoff" <os2-wireless_users@2rosenthals.com>
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Subject: Re: [OS2Wireless] Xbox 802.11b/g (2.4GHz) interference (was:
 Re: [OS2Wireless] First large-scale 802.11n wireless LAN...)

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* Lewis G Rosenthal wrote, On 11/29/2007 3:14 PM:
> 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).
let's rephrase that subchannels are not in consumer off-shelf equipment. 
We use APs and clients all the time with subchannels.
it does seem MS has some issues they need to address but for the most 
part noise in the 2.4 band is not going to go away but get worse so 
getting away from the consumer grade equipment will help the situation a 
little as well as give you more channels to work with.

leon
>
> The solution is for Microsoft to fix their broken boxes.
>

-- 
*Leon Zetekoff*
Proprietor 	
*Work:* 484-335-9920
*Mobile:* 610-223-8642
*Fax:* 484-335-9921
	*Email:* wa4zlw@arrl.net <mailto:wa4zlw@arrl.net>
*http://www.linkedin.com/in/leonzetekoff*
	*BackWoods Wireless*
<http://www.backwoodswireless.net> 505 B Main Street
<http://maps.google.com/maps?q=505+B+Main+Street%2CBlandon%2CPA+19510&hl=en> 
Blandon, PA 19510
"Bringing Broadband Technology to Rural Areas"

See who we know in common <http://www.linkedin.com/e/wwk/1265359/> 	Want 
a signature like this? <http://www.linkedin.com/e/sig/1265359/>


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