From firewalls-gc  Fri Jan 31 09:32:33 1997
From: peter () baileynm ! com (Peter da Silva)
Date: Fri, 31 Jan 1997 09:32:33 +0000
To: firewalls-gc
Subject: Re: [Fwd: Internal modems ?]
X-MARC-Message: https://marc.info/?l=firewalls-gc&m=87619433410975

> This is really a very interesting idea. And it should be relatively easy
> to implement. Since all modems sold conform to various v42bis v32, v34
> and other standards...

Not so. Telebit has a proprietary protocol called PEP in their Worldblazers.

> Not exactly, but modems use strict standards, and there are at most 50
> frequences or less in use. Piece of cake :)

PEP divides the spectrum in 512 channels, and transmits 2-6 bits per baud
through each channel at 7 baud, for a maximum bit rate of 21504 bits per
second. Not so fast, but it's damn near unblockable and works over phone
lines that would be hard-pressed to manage 300 baud FSK dialup.