Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!brutus.cs.uiuc.edu!apple!sun-barr!decwrl!nsc!csi!wclark
From: wclark@csi.3Com.Com (Wayne Clark)
Newsgroups: comp.protocols.ibm
Subject: Re: concise SNA LU 6.2 protocol description wanted
Keywords: SNA, LU 6.2
Message-ID: <1511@csib.csi.3Com.Com>
Date: 27 Nov 89 18:41:34 GMT
References: <1427@inria.inria.fr>
Reply-To: wclark@csib (Wayne Clark)
Organization: Communications Solutions Inc., San Jose, Ca
Lines: 39

In article <1427@inria.inria.fr> sterba@inria.fr (Milan Sterba) writes:
>Looking for a concise description of LU 6.2 protocol in order
>to write an emulation for it. Can anyone help ? Please mail
>response to sterba@inria.fr. Thanks.
>-- 
>--Milan Sterba-- (INRIA Rocquencourt)
>...uunet!mcvax!inria!sterba
>sterba@inria.fr				up to dec 1 1989 only !!!

As you might expect from IBM, there are not really any *concise* descriptions
of the LU 6.2 protocol.  However, I can give you the references which we used
to develop an LU 6.2 emulator:

  (1) Format and Protocol Reference Manual: Architectural Logic for
      LU Type 6.2, SC30-3269-3, 4th edition, December, 1985.
  (2) LU 6.2 Reference: Peer Protocols, SC31-6808-0, 1st edition, 
      September, 1988.

Depending upon the type of IBM system you wish to emulate and/or communicate
with, you can get by implementing the LU 6.2 protocol in either (1) or (2).
Older IBM systems that use LU 6.2 (roughly) implement (1) while newer ones
implement (2).  Examples of older ones are: CICS, S/36, S/38, APPC/PC.  
Examples of newer ones are:  AS/400.  I believe the OS/2 EE Comm Manager
really implements (1) as does VTAM 3.2.  Future versions of OS/2 EE and VTAM 
will probably migrate toward (2).

If you have enough time and lots of patience, you can produce a single emulation
that is a union of the capabilities in both (1) and (2).  After that, you can
either go to work for IBM or join a monastery!
--------------

Wayne Clark
IBM Connectivity Operations, 3Com Corporation
(formerly Communications Solutions, Inc.)

phone:  408/562-6967
EMail:  Wayne_Clark@SPD.3mail.3Com.COM
                 -or-
        {nsc,bnrmtv,epimass}!csi!wclark


Brought to you by Super Global Mega Corp .com