PLT devices

[Mike O'Dell]

Jim Thompson, who has built a lot of Wifi hardware, recommends a simple 
rule of thumb:
if two APs can hear each other, they should be on the same channel.

the Wifi radios are almost all direct-conversion "zero IF" designs and 
have essentially
*no* selectivity or dynamic range. as a result, radios on different 
channels just take turns being
"hidden transmitters", destroying throughput for all of them. with all 
the radios
on the same channel, while there are other issues, at least it doesn't 
degenerate to
pure, blind Aloha behavior immediately.

i'm trying to find his lengthy analysis of the cruftitude rampant in 
2.4GHz radios
and will post it when i find it.

     -mo


On 12/31/11 8:27 AM, Robert E. Seastrom wrote:
> Iain McFadyen<mcfadyenusa at yahoo.com>  writes:
>
>> The set top boxes have an 802.11b/g/n option, and I believe that this is the
>> direction to be used for deployment.
> That'll work really well in a dense environment like a block of flats
> where everyone can hear each other's signal (and well-intentioned
> people try to be slick by sitting on someone else's skirt as a result
> of setting their channel to something other than 1/6/11).
>
> I realize that dual radios on the AP cost more, but if you can move
> people's TV (and other stuff too) to the 5 ghz bands, at least they
> don't go as far or through construction materials as well.  In the far
> end from the network rack of my relatively small house, the 2.4 ghz
> stuff is 10 to 12 dB louder than the 5.8.
>
> -r
>
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