On 21/08/10 12:09, g wrote:
> On 08/21/2010 12:22 PM, Tim wrote:
> <snip>
>
>> All your wireless devices transmit on the same channel.
> yes and no. depends on manual assignment.
>
>> They just don't transmit at the same time as each other, they take turns.
> true. first to transmit/first heard.
>
>> That's why wireless sucks as a networking medium, when you have quite a
>> few devices in use on a network with a lot of traffic.
> true.
>
>> With wired networking, through a switch or router, many devices can all
>> talk simultaneously, if they're each talking to different devices.
> again, yes and no. with a switch, yes.
>
> with a router, no. again, first to transmit/first heard.
>
>
> as for wireless:
>
> simultaneously, different channels, true.
>
> simultaneously, same channel, not true, if all on same channel or thru a
> router, there will be collision. this is why network interfaces have
> collision detection. when collision is detected, a random delay is applied
> before retransmit.
>
> if a switch or router has a multiplexing ability, then receive/retransmit
> will be in an order.
>
>
> for wireless, what is needed, if not already, is ability for each interface
> to monitor in a delayed channel switch scan mode.
>
> when a signal is received, interface would listen for it's ip. if being
> 'called', it then replies and communications are established.
>
> if interface needs to communicate, it would first scan for an open channel,
> then send destination ip address and listen for reply.
>
>
> later.
>
> i need to fondle my figs.
>
I believe they are "spread spectrum" devices which enables them to
avoid mutual interference, not that I understand it but that's my
impression.
"Wi-Fi products use both single-carrier direct-sequence spread
spectrum radio technology (part of the larger family of spread
spectrum systems) and multi-carrier orthogonal
frequency-division multiplexing (OFDM) radio technology. The
deregulation of certain radio-frequencies[by whom?] for
unlicensed spread spectrum deployment enabled the development of
Wi-Fi products, Wi-Fi's onetime competitor HomeRF, Bluetooth,
and many other products such as some types of cordless
telephones." http://en.wikipedia.org/wiki/Wi-Fi
I need to buy a fig tree.
And I am running the system on the Netgear WNDR3300 with DD-WRT
installed. I'm still testing but so far the basics are working
without a hitch!.
Bob
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