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From: howard@cos.UUCP
Newsgroups: comp.dcom.lans,comp.protocols.misc
Subject: Re: MAP/TOP and ISO
Message-ID: <328@cos.COM>
Date: Thu, 18-Jun-87 17:27:11 EDT
Article-I.D.: cos.328
Posted: Thu Jun 18 17:27:11 1987
Date-Received: Sat, 20-Jun-87 02:09:10 EDT
References: <1204@botter.cs.vu.nl> <1680@munnari.oz> <192@ditmela.OZ> <1801@ames.UUCP>
Organization: Corporation for Open Systems, McLean, VA
Lines: 18
Keywords: osi, iso, internetworking, MAP, TOP
Xref: utgpu comp.dcom.lans:494 comp.protocols.misc:60

In article <1801@ames.UUCP>, lamaster@pioneer.arpa (Hugh LaMaster) writes:
> Is there any common level between MAP and TOP and the other ISO protocols
> which might correspond to "TCP/IP".  For example, in the arpa/tcp/ip world, IP
> is the common level.  Routing, gateways, etc., need to be done once, for IP.
> Since TP4 and IP are the ISO protocols which correspond to TCP and IP, is
> there any correspondence between TP4/IP and layers three and four of MAP
> and/or TOP? 
> 
MAP/TOP uses ISO TP4 and IP.
For WAN-LAN interconnection, X.25 is gatewayed into the LAN;
IP and TP run on top of the X.25 virtual circuit. 


>If there isn't, how will a TOP user communicate with an
> NVT/TP4/IP user on another LAN?
  
No problem.
No problem.