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From: richi@hpopd.pwd.hp.com (Richard Jennings)
Newsgroups: comp.dcom.telecom
Subject: Re: ISDN Links in UK
Message-ID: <16393@accuvax.nwu.edu>
Date: 24 Jan 91 13:52:19 GMT
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X-Telecom-Digest: Volume 11, Issue 65, Message 8 of 11


Olly Morgan writes:

> Will you need any special lines for ISDN transmission, or will this
> system work on any phone line?  If the later applies this is pretty
> amazing when considering current modem speeds. (64k/sec is promised?)
> What is it about ISDN that allows such greater performances?

ISDN is completely digital - it will run over the existing copper pair
from the switch to the subscriber - subject to the PTT (BT in this
case) approving the results of a BERT (Bit Error Rate Test).  Of
course, you must be on a digital exchange.

Hope this helps,

Richard Jennings, Software Development Engineer
Pinewood Information Systems Division,    the home of HP's Advanced
 Image Management System (HP AIMS), 
 AdvanceLink, OpenMail and Multi-media communications
 Hewlett-Packard
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