[svlug] wire less WAN/LAN
tin at le.org
Thu May 11 15:43:23 PDT 2000
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> THe problem I see with this technology is that :
> 1/ It can only be used for LAN or small MAN, otherwise the beam will
> go into space. ( the earth is not flat ). But that's ok because it
> is there market segment.
This is a limitation all wire-less technology that uses the microwave
frequency range and up faces. They pretty much require line-of-sight.
> 2/ optical network without fibers are ok if you "see" the destination
> from the source ( i.e. no obstacle ). Ok that 's good in NY,
> where you have few nice and tall buildings but in the SV it is rather
Which is why TeraBeam and similar companies are targeting metropolitan
areas. Cities have high rise blds.
> 3/ Weather interference can be avoided just by increasing the
> modulation frequency. ( it is used with satelite communication )
> But then the signal may not be visible, i.e. it is a different
> technology, and I may need a parabolic antenna instead of a light
Increasing mod freq will run into bandwidth limit eventually. The range
your equipment operate in is limited by the freq range you are assigned.
It's a trade-off.
> Also have a look at www.yipes.com they have a different approach of
> the same market.
> What may be interesting with this techno is how fast they may be able
> to setup a network. They may be able to setup a dynamic ( physical )
> network, that is configuring itself according to its current state
> of congestion.
You've hit it on the head. These types of technologies are aiming
for a certain niche. They can be setup much faster than wired approach,
usually much cheaper if cost is amortized over time. It used to be very
expensive for a pair of wireless routers (in the 20K range). The price
has dropped a lot recently.
Internet Security and Firewall Consulting
Tin Le - tin at le.org
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