My understanding about 60ghz (what I remember reading anyway) is that
its good for 1000mbps data links, but MAX distance of 1Mile, since O2
(Oxygen) resonates at 60ghz. It was originally used for spy satellite to
spy satellite links (in space), since it couldn't conceivably be picked
up by any antenna on the ground, friend or foe.
pd
Mario Pommier wrote:
Bridgewave 60Ghz works excellently! Very nice stuff. Full Gbps full
duplex speeds. Few computers or laptops, if any at all, can reach those
speeds. Our sysadmin figured a way to test capacity with Cisco switches
on both ends by flooding the link.
Expensive. Yes.
I only see it possible to be deployed in 100%-paid-for PtP projects:
medical, government, industrial -- anyway it won't go more than
~700meters, the drier the area the better.
If I understood correctly, the US Gov bans US 60Ghz manufacturers
from exporting their gear outside the US because when the US military
goes somewhere they can't find 60Ghz links -- that's how secure it is:
very narrow beamwidths (~1*) and complete signal fade after about
1mile. If you don't know the link is there (or you can't see the
antennas) it's practically impossible to find the stuff. Whereas for
licensed 70 and 80Ghz all you need to do is look in the FCC website to
know who deployed what-where-when and how.
Regarding deployment: you need TOTAL LOS. Even branches blowing in
and out of the path will drop the link.
Mario
Dawn DiPietro wrote:
Mark,
I think 60 Ghz is a good solution if you can afford it. At this point
it is still not in the price range of the average WISP but it is great
stuff.
I think Matt Liotta had a link or 2 with some 60 Ghz gear.
Regards,
Dawn DiPietro
wispa wrote:
In the search for the bigger last mile pipe, there's unlicensed at
both 17 and 60 ghz. I'm not sure if the consumer electronics
industry is "up" for working at 60 ghz, but what about 17 ghz?
Google gets me a lot of theoretical work at both, and engineering
discussions of both, but nothing that looks like something otehr than
"talkware".
--------------------------------------------
Mark Koskenmaki <> Neofast, Inc
Broadband for the Walla Walla Valley and Blue Mountains
541-969-8200
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