Can 802.11 Become A Viable Last-Mile Alternative? 206
NikiScevak writes "As telco's around the world move from government hands to private investors the incentive for them to create compeition at the wholesale DSL level drops dramatically. The CSIRO in Australia are investigating the use of Wireless LAN technology 802.11b as a means through which to provide alternative broadband access, achieving range of up to 7km with standard components."
Ugh.... (Score:3, Informative)
Honestly, I wouldn't mind being able to drive around and have allways on access in my car or something like that, but wireless does not cut it.... Collissions, and cordless phones reek havoc with 802.11b. I use a 100mw ap at my office... when I'm on my cordless phone... my laptop says the link quality is 10-20%.... and the ap is 20 feet away...
Fine if the land is flat (Score:2, Informative)
Re:Bad if you do this on a large Scale? (Score:3, Informative)
help that much from interception and interference. You will still get the signal
out of their projected beacon (which is still several degrees wide, BTW),
but a bit lower. Radio waves don't work the same way
light does, it's like thinking that nobody will hear
you shouting when you go behind a building..
Some people (ahem) had this idea a while ago.. :) (Score:2, Informative)
Al.
HantsWireless [hantswireless.com] - Hampshire Wireless
SurreyWireless [surreywireless.com] - Surrey Wireless
Re:$200 per 1 mile does not add up. (Score:3, Informative)
Re:802.11 will never be a last mile alternative (Score:3, Informative)
GSM has an intrinsic part of its design to ramp down the power that the phones transmit at when the signals are strong. It was always designed to work in a crowded network. After all, it has a 35 Km range in its design, yet a cell in the centre of a city would theoretically cover most of even a large town.
This was one of the biggest problems with older analogue networks - they always transmitted at full power and had trouble with crowding out in densely populated areas.
As a bonus, your phone's batteries last alot longer in a city than in the country on a GSM network (but not on analog phone).
Yours,
Michael
Re:Read the article (and a few books on Security) (Score:2, Informative)
At the provider side? For a few point-to-point customers yes, but normally you have an omnirange at the provider and (more or less ugly) directionals at the customer side.
I live in Slovakia, where there still is a monopoly for the wired local loop to the end of this year. We have no commercially available DSL yet. Of course the wireless is cheaper and everyone and his brother is using it for everything and does not give a sh*t about the regulations.
The band already is clogged in the bigger cities. It does not matter how one company plan the network - there are many and they are not going to plan it together.
The reach is no problem - I know of a few 20 km point-to-point links. The density is and the unregulated band is not a way. There are technologies in the regulated bands (FWA at 3.5 and 26 GHz here) that are meant to provide a high-speed local loop. WiFi as a last mile is a kludge - it will work but...
Re:could someone explain to me... (Score:1, Informative)
http://www.dslreports.com/forum/dslalt
Re:Cable and DSL insecure as well... (Score:3, Informative)
Somebody once told me that a T-Bird (T1...T3 packet sniffer) cost 40 grand.
Yeah, and a PC used to cost $4G, too.
Dallas Semiconductor makes E1/T1 framer ICs which you could interface to a Motorola 68k or something nice and fast for peanuts. It's been a while since I went through the Dallas datasheets but I'm certain that you can use them to sniff the data stream with a little extra circuitry to block any transmissions from the third (sniffer) framer. The actual data stream on the wire is very well documented and if you put something like this on a PCI card and modified some Linux WAN drivers I'm sure you could make a sniffer without too much difficulty. Hell it'd be even easier if you modified an existing supported WAN card with an internal DSU, like the LMC 1200.
No matter how you look at it, it'll be hardware mods + software mods, unless the framer can be programmed NOT to emit anything, which I'm not sure is possible. Also DS2/3 sniffers will be a good sight more expensive I'm sure. The loop lengths on those are not very long for copper and there's a lot more critical timing.
Now you could say that this knowledge is specialized and that the design of such a thing could be $40k -- true enough. I happen to have the knowledge and I do contract design work... :-)
Last 5-10 miles here in Wisconsin (Score:2, Informative)
Re:$200 per 1 mile does not add up. (Score:3, Informative)
Twisted-pair ethernet uses differential signaling (a transmitted "one" bit is sent out as a positive pulse on the TX+ line and a negative pulse on the TX- line). There is no requirement for a common ground.
It is entierely possibal for your comptuer to be at 100 volts realtive to your neighbors.
No, because the ground on both computers is plugged into, well, the ground.
it will destroy your computers.
But what won't these days? [nai.com]