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Path: utzoo!watmath!clyde!floyd!harpo!decvax!mcvax!piet
From: piet@mcvax.UUCP (Piet Beertema)
Newsgroups: net.dcom
Subject: Re: Cost of X.25 networks vs. cost of 1200 bps
Message-ID: <5763@mcvax.UUCP>
Date: Wed, 28-Mar-84 09:04:14 EST
Article-I.D.: mcvax.5763
Posted: Wed Mar 28 09:04:14 1984
Date-Received: Fri, 30-Mar-84 00:39:08 EST
References: <6482@decwrl.UUCP>
Organization: CWI, Amsterdam
Lines: 19

Your figures are correct if you take into account interstate connections.
However things get very different on international links:

On our transatlantic links we've found about the same effective speed
for 1200 bps phone links, viz. ~850 bps. The net cost here would be about
$0,3 per Kchar; however the transatlantic phone links are full of problems
causing the actual cost to be considerably higher.

On our experimental X.25 links within Europe I found an effective speed
of 2400 bps possible. Assuming the same speed could be obtained on
transatlantic links, the net cost would be $0.1 per Kchar. Besides it
is expected the X.25 links will give far less problems.

About the same story goes for phone vs. X.25 international links in Europe.
But within a country X.25 IS much more expensive. The morale: use X.25
only for international/intercontinental links.
-- 
	Piet Beertema, CWI, Amsterdam
	...{decvax,philabs}!mcvax!piet