I'm operating a small ISP using a radio modem. We use FreeWave radio
modems. They operate at 900Mhz, I believe (same as cell phones) and have
an advertized range of 20 miles, but have been known to operate at
distances up to 80 miles in extreme line-of-site situations (hilltop to
hilltop sort of things). They operate at 115.2kbps (same speed as a 16550
UART). In our situation we are not completely line-of-site so we have a
repeater which cuts our throughput to 57.6kbps, but with the addition of a
second radio-modem at our mid-point we can again get 115.2kbps.
The cost for the radios is, I believe, about $700/each, plus whatever
antennas are required to reach your required height for line-of-site, etc.
We've spent about $2400 on our three radio modems (two end-points plus the
one repeater) and our antennas.
The radios do no compression of their own, but with the addition of
software compression (such as deflate or bsd_comp in the Linux PPP
driver) you can get increased throughput.
-- James
On Thu, 24 Jun 1999, Herman Aa wrote:
> Jones,
>
> In principle using a radio instead of telephone is simple. But
> the application is a lot harder.
> First 'a radio' is far from defined. What radio you have available?
> HF (below 30MHz) or VHF, or UHF, or SHF? All behave different as
> far speed goes. An HF radio provides speeds below 1kB. Even that
> takes more than your computer cost.
> Going to higher freqs, higher speeds are available due to lower
> background noise (natural noise) and wider bandwidth. Most of us
> Internet users are using satellite links (=radio links).
>
> As an individual it depends mostly on what equipment you can get
> your hands on. Packet modems are used instead of tel.modems.
> (MO-DEM = MOdulator/ DEModulator. You cannot sent raw bits over
> radio, or telephone. A modem is required.)
> By the time you have added the cost you will appreciate what you
> pay for your telephone.
>
> A cheaper way is to go the cellular telephone route. The advanced
> system are digital of their own and can give practical speeds to
> link to your ISP.
>
> But a regular tel.modem is still the cheapest aside from
> moving-in with your ISP....
>
> At 01:50 PM 6/23/99 +0100, Jones Olatunji wrote:
> >Dear Friends,.
> > I presently use ppp on slackware 2.0.29 to connect to my ISP using a
> >phone line. I want to change to radio link to my ISP. Can you please
> >advise on the things I need to watch out for.
> >
> >Thanks.
> >Jones
> >
>
>
> Herman Aalderink,
> Cebu island, Philippines.
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-ppp" in
> the body of a message to [EMAIL PROTECTED]
>
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Jonathan Hall * [EMAIL PROTECTED] * PGP public key available
Systems Admin, Future Internet Services; Goessel, KS * (316) 367-2487
http://www.futureks.net * PGP Key ID: FE 00 FD 51
-= Running Debian GNU/Linux 2.0, kernel 2.0.36 =-
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
To unsubscribe from this list: send the line "unsubscribe linux-ppp" in
the body of a message to [EMAIL PROTECTED]
