Hi,
the WiMaxCost(that is my personally name for WiMax:-) ) is stil on the "early"
development.The first acceptable products will be on the market from 1-3years(depend
on your volet:-) ).
To me (becouse I'm from EU) is "the most promising technology":-)
802.11h (before called European Hyperlan) the standard is 802.11h and the band range
5470-5725MHz (255MHz extra space:-) ).That mean 12? non everlaping channels(Wi-Fi have
only 3) and the fact that the
draft(http://www.ero.dk/D697CBE5-5527-48C5-A6F6-9342C611D4AD.W5Doc?frames=0) is
describing 1W e.i.r.p. for the outdoor(that mean around 5-12miles).Of course the
802.11h cannot be compared with the robust WiMaxCost,but anyway the upper 5GHz band is
a natural step from the noise Wi-Fi to the longer and in fact faster distance for a
acceptable price(price to be define:-),but is promising:-) ).The 5470-5725MHz will be
available as I know until end of the year(in EU).
Regards,
David
PS:A good information about Wi-MaxCost are available at the Wi-Max forum:
http://forums.wi-fiplanet.com/
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On May 20, 2004, at 5:25 PM, Karl Medina wrote:
> =A0Is WiMAX leaving 802.11a-b-g behind?
> Intel has called 802.16 "the most important thing since the Internet=20=
> itself" and to me a 30 mile coverage area spells doom for a-b-g.=20
> Anyone out there with the negatives on the=A0ledger for 802.16x which=A0=
=20
> won't be heard from the WiMAX industry group?=A0
think I've been loud enough about the fact that 802.16 in unlicensed=20=
spectrum being interference-limited (just like WiFi), and that these=20
"outdoor/residential broadband" wireless networks, while highly=20
desirable from certain segments, are entirely ill-considered and will=20
ultimately fail.
.16 in licensed spectrum is doomed for different reasons, mostly having=20=
to do with interference again, but this time from CCI and ACI due to=20
other (licensed) transmitters.
Intel has a brown thumb when it comes to RF. I've been known to=20
quote: "INTC + RF =3D 0". Say this in-front of anyone who has seen=20
Intel fail, repeatedly, at things RF and you'll get one of two=20
reactions:
1) a knowing smile, typically from those who aren't employed by Intel.
2) resignation, (typically from those that are)
lately I get folks from Intel insisting that I'm wrong, but their=20
argument (and the argument from the rest of the pro-WiMax crowd) is one=20=
centered on economics ("its cheaper with wireless" (*)) and completely=20=
discounts the physics of the situation, which run counter to the=20
desires of the pro-WiMax crowd.
In the end, WiMax (in fact, any fixed wireless system) will succeed in=20=
limited deployments, but can't scale. This is straightforward to prove=20=
with mathematics. The only provable way to build a scalable wireless=20=
network (with any real capacity) is via mesh, but even here, those who=20=
dream of succeeding with mesh on top of 802.11 are doomed.
I (once again) point to Tim Shepard's MIT thesis. Its all in there,=20
in solid mathematics. =20
http://www.lcs.mit.edu/publications/pubs/pdf/MIT-LCS-TR-670.pdf
Jim
(*) the logical endpoint of the WiMax dream seems to be $10/mo wireless=20=
broadband to the home. ("We'll be rich!") I heard this kind of talk=20
far too often during Vivato board meetings. Besides missing the point=20=
(that fixed wireless is far too fragile/unreliable to provision a=20
service (You're damned by the first yahoo that brings up a continuous=20
tx close to your "basestation"), this *dream* my be the root cause of=20
Vivato's missteps at the hands of its founders. It wasn't supposed to=20=
be about "4 mile WiFi".
--Apple-Mail-17--579331189--
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