Path: utzoo!mnetor!uunet!husc6!bloom-beacon!gatech!uflorida!codas!burl!clyde!watmath!looking!brad
From: brad@looking.UUCP (Brad Templeton)
Newsgroups: comp.dcom.modems
Subject: Re: hayes 9600 vs. trailblazer
Message-ID: <1545@looking.UUCP>
Date: 7 Apr 88 17:22:08 GMT
References: <791@spdcc.COM> <8835@e.ms.uky.edu>
Reply-To: brad@looking.UUCP (Brad Templeton)
Distribution: na
Organization: Looking Glass Software Ltd.
Lines: 19

I am told the V32 protocol actually uses the same carriers to go both
directions, and that the modems are capable of detecting and removing
the echo of their own transmissions from the lines so that they don't
get confused.  This is more than just dealing with echo suppressors.

Telebit says they're going to support this in software someday, unless
they become the only real high speed standard, but it seems to me that
this would take a bit of special hardware.

After all, if they could do this, they could make each of their 512
carriers bi-directional for 1500 bytes/second in each direction.

Not that one really needs that, in most applications.  But I don't understand
why the trailblazer doesn't permanently dedicate a couple of channels to the
answer modem and a couple to the originate modem, and use the rest
adaptively.  Then there would no no turnaround delay for ACK packets and
character echo, or so it would seem.
-- 
Brad Templeton, Looking Glass Software Ltd. - Waterloo, Ontario 519/884-7473