Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!gatech!purdue!haven!adm!cmcl2!uupsi!ccavax!bruce
From: bruce@ccavax.camb.com
Newsgroups: comp.dcom.modems
Subject: Re: Help with international modem connection
Message-ID: <34975.273c82c9@ccavax.camb.com>
Date: 11 Nov 90 02:44:25 GMT
References: <7955@ucdavis.ucdavis.edu>
Distribution: usa
Organization: Cambridge Computer Associates, Inc.
Lines: 12

In article <7955@ucdavis.ucdavis.edu>, dias@iris.ucdavis.edu (Gihan Dias) writes:
> A side question: What does the guard tone do? Should I turn it
> on?

If it is what I think it is, it inhibits echo suppressors that you very much
do not want in your connection. They are switch gain repeaters that perform
an electronic push-to-talk function leaving the signal path in the opposite
direction attenuated. Certainly try turning it on.

The newer active echo cancelers used on satelite circuits are probably a 
different issue. They are also what is built into the v.32 modems to allow 
full use of the bandwith both directions at once.