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From: hrs@homxb.UUCP
Newsgroups: comp.dcom.modems
Subject: Re: Facsimile modems vs Regular modems?
Message-ID: <345@homxb.UUCP>
Date: Tue, 2-Jun-87 17:42:29 EDT
Article-I.D.: homxb.345
Posted: Tue Jun  2 17:42:29 1987
Date-Received: Thu, 4-Jun-87 06:49:46 EDT
References: <306@gen1.UUCP> <4127@mnetor.UUCP>
Organization: AT&T Bell Laboratories, Holmdel
Lines: 24
Summary: fax modems are (not) different

> >
> >  So my question is what is the difference between a regular modem and
> >a facs modem and can I use facs modems to create a cheap, high speed
> >private network?
> 
> Turning it around, does this mean that regular modems cannot be used
> to connect to a fax machine?
> -- 
> 
The modem in a fax machine is an integral part of the machime, at
lest in G3 fax.  The protocol starts trying to send at 9600, using
V.29.  For all other purposes besides fax, V.29 is considered a
private line modem.  Thus, the V.29 implementation in G3 fax is not
considered to be a modem, but only an im[plementation of the modem
protocol.

If 9600 doesn't make it, the protocol falls back to 7200 V.29, and then
to V.27ter 4800 and 2400.

If you used a "regular" V.29 modem to connect to a fax, you would
also have to implement the protocols.  Thse are described in 
Recommendation T.30.

Herman Silbiger ihnp4!homxb!hrs