[opendtv] Re: its a wifi world - Re: Re: Twang's
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 27 Apr 2004 18:33:05 -0400
Venki S. Iyer wrote:
> From a service provider perspective,
> if I am installing meshed wifi APs in each customer home,
> what's to stop me
> from using some protion of the available bandwidth
> for multicast ("broadcast") purposes? Sure, I'd need the
> right legalese
> within my customer contracts, etc, but that's all (apart
> from actually getting content to re-broadcast).
Speaking only about technical issues, not legal ones, I'd
say no problem. As an ISP, go for it.
But this in no way competes with DTT broadcast delivery.
It's a separate matter. If anyone expects DTT delivery to
depend on 802.11 instead of the allocated DTV spectrum,
then these people are:
(a) using WLANs to provide continuous coverage of the
same material, which would defeat one of the *key*
features of 802.11 (frequency reuse), and/or
(b) dedicating all of the WLAN bandwidth to TV delivery
and potentially still unable to transmit all of the
market's OTA stations.
Eventually we'll have 100 Mb/s 802.11, which could do a
reasonable job of providing local broadcasts of DTV in
many smaller markets. But to compete with ATSC delivery,
you'd need an awful lot of these WLANs, which will
*therefore* render their intended mission unachievable.
There are barely enough frequencies available to provide
continuous coverage, at least in the 2.4 GHz band of
802.11b and g, and these will be taken up with DTV
broadcasts. And range restrictions only get more acute
as you bump up the bit rate to accommodate the DTT
stations in a market.
So it is disturbing to me to see people in leadership
positions throw out these red herrings. It just spins up
the uninformed and defocuses those who need to remain
focused. If TV is such a spectrum hog, as lots of people
complain about, then why would anyone assume that by
moving TV to a different transmission protocol, the
spectrum issue would disappear? It's a bit like
proposing that perpetual motion machine to solve the
energy crisis.
Bert
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