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From: berlen@teculx.tecsiel.it
Newsgroups: comp.protocols.iso.x400
Subject: MHS '84 over Session V2
Message-ID: <9105061703.AA04462@tecsiel.it>
Date: 6 May 91 17:44:36 GMT
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My problem: to run a MHS version '84 conforming ENV 41201 over a
SESSION version 2 not able to downgrade to session V1, is out of
(functional) standard?

ENV 41201 says the session standards to be conformant with are ISO 8326
(services) and ISO 8327 (protocol), but no reference is made to
ISO 8326 DAD1 and ISO 8327 DAD2 which imply session version 2.

It is important to emphasize that a session V2 non downgrading to
session V1 doesn't interoperate with a session V1.

Furthermore the new final draft of EWOS-ETSI MHS '88 A3311 functional
standard explicitly says the supported session is session V2 even when
supporting the downgrading to '84 functional group; this could then
imply interoperability problem if the '84 implementation runs over a
session V2.

        Oronzo Berlen
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