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Subject: TCP-Group Digest 98/16
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TCP-Group Digest Wed, 11 Feb 98 Volume 98 : Issue 16
Today's Topics:
wearable telephone gateway
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Loop-Detect: TCP-Group:98/16
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Date: Wed, 11 Feb 1998 16:39:58 +1100
From: Terry Dawson <terry@perf.no.itg.telstra.com.au>
Subject: wearable telephone gateway
Darxus wrote:
> 1st concept is a wearable computer.
>
> Second concept is the AX.25 internet connection concept -- hook up a
> portable HAM radio to a wearable, and connect via radio waves (TCP/IP
> encapsulated in AX.25) to a computer at your house, and route your
> connection through to the internet via a dialup modem.
>
> Third concept is encapsulating phone calles through a network like the
> internet. You could do funky things like calling a local number, which
> happens to be a computer, which connects to a remote computer, via the
> internet, in the area code of the phone number you wish to connect to, and
> encapsulates your phone call. No charge.: (login) session opened for user
> darxus by darxus(uid=0)
Most of these things have already been demonstrated as feasible in
one fashion or another.
Wearable computers are a reality in a not particularly utilatarian
fashion already.
AX.25 Internet connections have existed for some time. I've known
people who have operated packet radio in a mobile capacity, bringing
the two together is trivial.
I've done voice over IP over AX.25 myself. I used the gsm speech
compression algorithm and a fairly conventional linux based 4800bps
packet radio configuration. It was store and forward style, ie
push to talk simplex operation, so they were "walkietalkie" type
communications, but with only 4800bps simplex packet radio you don't
get much option :)
There is no good reason why the addition of a silence detection
algorithm and enough processing power to do the compression quickly
couldn't produce a workable system fairly easily. Mind you, if you
have a perfectly good radio system in place, you'd have to ask why
you'd bother :) It'd be much simpler to just do an analog phone
patch.
> There are, of course, problems. Getting a voice stream to a phone line
> (which could actually be easy, I haven't looked into it), the current
> bandwith constraints of AX.25 and the bandwith requirements of
> bidirectional voice straeming.
There are no inherent bandwidth constraints for AX.25, it is the radio
and the modem that are the largest constraint. Running IP over AX.25/UI
mode is moderately efficient with large packet sizes.
Terry
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End of TCP-Group Digest V98 #16
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