[MLB-WIRELESS] Internet Feed offer.

Tony Langdon tlangdon at atctraining.com.au
Mon Jan 14 14:36:14 EST 2002


> My testing with 802.11b stuff show me severe speed
> degredation with distance.
> Perfect Line Of site is ok for 1-2 km at 3-6 m/bit
> Anything more you start getting sub 1 mbit speeds.
> Just not worth the trouble.
> at least with 11a you start with a base rate 5 time
> faster.  Just waiting to get my hands on a access
> point and cards to play with.

And do you know this for sure?  One issue that I'm trying to raise awareness
of is that a particular channel (consisting of Tx, RX and path) can only
carry so much data, _regardless_ of whatever fancy modulation scheme used.
The ultimate limit is the signal to noise ratio at the receiver.

What does this mean?

It means simply that the newer technologies, unless accompanied by an
appropriate increase in power limits (as if, yeah, right) may not give us
much improvement in performance.  We may gain a bit because the protocol
used is more efficient, or can handshake better over longer paths, but as
far as stuffing the bits through the air, they wouldn't crank out much more
than 802.11b on the longer paths (unless all the b cards have crook
receivers ;) ).

So these newer systems may give fantastic data rates to the PC on the next
desk, but still 150 kbps to the guy 10km down the road.  But hey, 150k still
beats a bloody modem! :)

> "nobody mention internet"?  why, what else is this
> syetm for?  You have to be kidding with that
> statement, We can get internet leggally, we just have
> to pay for it. And we can get it at a wholesale price,

Well, if the Brisbane boys are right, the carrier licence issue maybe can be
resolved - but I wouldn't hang my hat on that just yet.  I haven't read the
Telco Act myself, so only going on secondhand info here.  However, I suspect
once the money starts flowing, you probably need a carrier licence for the
wireless network...  The Brisbanites may know more here...

> off set cost maybe with some advertising and small
> proxy fees.  Most small ISP don't even have 512K!
> It will only cost about $40K per year, may be just
> under, That is very cheap.  Say spread it amongst 200
> users, thats only $200 per year each! Unlimited Hours
> 24/7, not bye counting, what a deal!!!

Be interesting to see how well the bandwidth is shared.  512k with 40
simultaneous users is generally pretty good (We used to do that here from
time to time).  With 200 users all on at once, hmmm.  However, I have the 40
figure, because generally not everyone will be surfing at the exact time.

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