old modems & a packet switcher

From: Sam Ismail <dastar_at_ncal.verio.com>
Date: Mon Aug 3 17:04:07 1998

On Mon, 3 Aug 1998, Tony Duell wrote:

> > > public network? I've got a couple of old BT modems that seem to be
> > > designed to only work on a private, internal network (at least that's
> > > what the manuals imply), so maybe line voltages are different or
> > > whatever...
> >
> > Line voltages would not (and could not) differ unless it was some short
> > haul modem. The higher layer protocols might though.
>
> Hmm... In the UK it's possible (I believe) to get a point-to-point link
> from BT (The Telephone Company) with no 'battery' on the line. That's to
> say that the line is electrically dead, and that you don't get 48V DC
> across it.

Hmmm. Well, I wonder about this. I know such services exist in the US as
well, but they still at least have battery on the line. I would wonder
what good a dry point-to-point connection through the telco would be over
several miles, where the resistance in that length of wire would absorb
whatever voltage you put on it.

Sam Alternate e-mail: dastar_at_siconic.com
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Received on Mon Aug 03 1998 - 17:04:07 BST

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