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From: munnari!ucsvc.ucs.unimelb.edu.au!U5434122@uunet.uu.net
Newsgroups: comp.dcom.telecom
Subject: Re: Data Lines vs. Voice Lines
Message-ID: <12996@accuvax.nwu.edu>
Date: 5 Oct 90 01:49:47 GMT
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X-Telecom-Digest: Volume 10, Issue 710, Message 3 of 12


In article <12893@accuvax.nwu.edu>, cognos!geovision!gd@dciem.uucp
(Gord Deinstadt) writes:

> hayes!tnixon@uunet.uu.net (Toby Nixon) writes:

>>CCITT Study Group XV is currently leading a study (along with Study
>>Groups VIII and XVII) on compression of fax and modem traffic on
>>digital trunks.  It would involve demodulation of the signal,
>>transmission of the original bits, and remodulation when the signal
>>reaches the other end.  This way, instead of wasting an entire 64kHz
>>DS0, the network can use only 2.4KHz for a V.22bis connection, 9.6KHz
>>for V.32, etc -- and pack them into DS0s to save bandwidth.

> We already *have* a system that does this; in Canada it's called
> Datapac.  But instead of developing it into something w

Australia has a Faxstream service which supposedly demodulates the fax
message, packetizes it, sends it through the network digitally and
delivers it to the recipient when the recipient is not busy.  Delayed
delivery and broadcast are also available, but I don't know any
details (Time to ring yet another 008 rep :-) ) I think you just have
to subscribe your fax's phone line and have FaxStream intercept your
outgoing calls on request.  It is supposed to be cheaper than direct
dial LD, but I don't know anyone who uses it.


Danny