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From: mwg@petrus.UUCP (Mark Garrett)
Newsgroups: net.lan,net.dcom,net.decus
Subject: ISO layer 4 and up...
Message-ID: <95@petrus.UUCP>
Date: Thu, 17-Apr-86 09:15:44 EST
Article-I.D.: petrus.95
Posted: Thu Apr 17 09:15:44 1986
Date-Received: Fri, 18-Apr-86 05:54:25 EST
References: <424@gould9.UUCP> <319@ptsfd.UUCP> <102@ico.UUCP> <326@ptsfd.UUCP> <106@ico.UUCP>
Organization: Bell Communications Research, Inc
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Xref: watmath net.lan:1424 net.dcom:1813 net.decus:303

> > >Not true!  Standard protocols exist for layers 4 and 5.  Layers 6 and
> > >7 have gone to DIS form (Draft International Standard) and are
> > >supposed to go for 6 month ballot in June.  There should be
> > >International Standards at all 7 layers by the end of 1986....
> > >Doug McCallum

Can someone clarify for me how layer 7 can be standardized without
knowing the application?   I think the difficulty in making higher
layer protocols is that you can't optimize them for a variety of
services.  I'm working from a context of metropolitan area networks
(basically grown from LANs) where one hopes to have integrated
services (data, voice, video - the usual catch-words).  You can't
even run these all through the same MAC (physical/data-link) level
never mind transport and session layers.

What do these proposed layer 4-7 protocols do, and what kinds of traffic
do they apply to?

-Mark Garrett
Bellcore