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From: jwb@monu6.cc.monash.edu.au (Jim Breen)
Newsgroups: comp.dcom.telecom
Subject: Re: A Potential Downside to ISDN
Message-ID: <14444@accuvax.nwu.edu>
Date: 6 Nov 90 22:05:36 GMT
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In article <14368@accuvax.nwu.edu>, U5434122@ucsvc.ucs.unimelb.edu.au
writes:

> I imagine that since digital voice telephony allocates 64kbps to a
> channel the telcos will be hard pressed to justify charging different
> rates for different uses.  If an analogue modem is used on a digital
> telephony circuit, then the situation is no different than before.

Almost correct. Telecom Australia has a slightly lower tariff on 64k
"digital telephony" than on 64k "digital data". On questioning they
say that with digital telephony circuits they will be free to use
interpolation techniques at a later stage, whereas they will leave the
data circuits alone. The message here is to use the lower tariff
circuits until Telecom ever gets around to putting in compression/
interpolation equipment (if ever.)

A modem which maintains continuous carrier should be ok. Of course
using a modem over ISDN is a terrible waste of bandwidth.


Jim Breen ($B?@Ip(J) (jwb@monu6.cc.monash.edu.au) 
Dept of  Robotics & Digital Technology. Monash University
      PO Box 197 Caulfield East VIC 3145 Australia
       (ph) +61 3 573 2552 (fax) +61 3 573 2745