Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/17/84; site opus.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!hao!cires!nbires!opus!mccallum From: mccallum@opus.UUCP (Doug McCallum) Newsgroups: net.dcom,net.unix-wizards Subject: Re: Wanted: ISO level 4 Message-ID: <909@opus.UUCP> Date: Wed, 17-Oct-84 15:27:11 EDT Article-I.D.: opus.909 Posted: Wed Oct 17 15:27:11 1984 Date-Received: Fri, 19-Oct-84 01:57:43 EDT References: <4430@ukc.UUCP> <5313@brl-tgr.ARPA> Organization: NBI,Inc, Boulder CO Lines: 22 > "ISO level 4 (the transport level)" is an abstraction. > It can be realized in different ways, and has been on systems > such as 4.2BSD. You need to find out just what your friend is > really after. ISO level 4 (NBS/ISO TP4) is also a real protocol that is very close to being an international standard. It is currently in DIS (Draft International Standard) form (ISO/DIS 8072 for the Transport service definition and ISO/DIS 8073 for the Connection oriented transport protocol specification). This is the protocol that was used at the NCC network demo. All 7 layers of the ISO Reference Model will have ISO protocols defined for them. Currently, Network is fairly stable but still a DP (Draft Proposal), Transport is being finalized, Session is in DIS form. The higher layers are in varying states depending on the application intended. Presentation is a ways from completion. There has also been some talk that the National Academy of Science is completing a study that will recommend that DoD adopt the ISO Class 4 protocol. NATO has already said they will adopt it. It will be interesting to see what happens over the next few years. Doug McCallum {allegra, btlunix, ucbvax, hao}!nbires!mccallum