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Article #742Re: ISO Class 4 - what is it?
From: dan
Date: Mon, 27 May 1985 02:25
Date: Mon, 27 May 1985 02:25
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I attended a lecture on this subject a while back. As I recall, the term "ISO Transport Class 4 protocol" does refer to a TCP-like protocol. The different classes of transport layer make different assumptions about the reliability, etc. of the lower layer, and may also provide slightly different services to the next layer up. The American member(s) of ISO pushed for a TCP-like transport layer, with much resistance from the rest of ISO, and the different classes of transport layer were the result. Class 0 is a null layer; it assumes that the layer underneath Transport provides reliable, error-free transmission. The other classes assume different kinds of potential failure of the lower layer. Dan Franklin
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: $Revision: 1.6.2.16 $; site haddock.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!bonnie!akgua!mcnc!decvax!yale!haddock!dan From: dan@haddock.UUCP Newsgroups: net.lan Subject: Re: ISO Class 4 - what is it? Message-ID: <19000003@haddock.UUCP> Date: Sun, 26-May-85 22:25:00 EDT Article-I.D.: haddock.19000003 Posted: Sun May 26 22:25:00 1985 Date-Received: Thu, 30-May-85 03:43:47 EDT References: <1302@ecsvax.UUCP> Lines: 14 Nf-ID: #R:ecsvax:-130200:haddock:19000003:000:719 Nf-From: haddock!dan May 26 22:25:00 1985