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Date: Sat, 01 Dec 2007 19:26:12 -0500
From: "Lewis G Rosenthal" <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...)

On 11/30/07 10:23 am, Leon D. Zetekoff thus wrote :
> * Lewis G Rosenthal wrote, On 11/29/2007 9:01 PM:
>> On 11/29/07 05:32 pm, Leon D. Zetekoff thus wrote :
>>> * Lewis G Rosenthal wrote, On 11/29/2007 3:14 PM:
>>>
>> <snip>
>>>> 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.
>>>
>> How do you get away from consumer grade equipment when Intel 3945AGN 
>> adapters (et. seq.) *are* consumer grade? I agree that the 
>> interference isn't going away; I think the answer on the client side 
>> is attenuation, either by cleverly designed reflectors/deflectors, 
>> supplementary antennae, or by some type of discreet software 
>> filtering. That said, I'm *not* a radio guy, so perhaps someone with 
>> more HAM experience may want to chime in here.
>>
> has nothing to do with ham or not...it depends on the firmware running 
> on those interfaces as well. The ubiquiti (and others) radio cards do 
> support subchannels and the OS being used does as well. Noise is noise 
> whether it is from a wideband signal over a narrower signal but when 
> you do move to a subchannel, it is like putting a filter in place; not 
> totally but pretty much close to it.
>
Please explain how to select a subchannel in XWLAN running a device 
controlled by GenMAC, or how to acomplish the same with a LinkSys WRT54G 
router using either factory firmware or DD-WRT. I'm all ears...

My statement about HAM radio is related to noise filtering. I would 
guess that people with more radio experience than I might have more to 
say insofar as filtering is concerned, that's all.

-- 
Lewis
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Lewis G Rosenthal, CNA, CLP, CLE
Rosenthal & Rosenthal, LLC
Accountants / Network Consultants
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