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From: chuck@felix.UUCP (Chuck Vertrees)
Newsgroups: comp.org.decus
Subject: Re: vt62
Message-ID: <3579@felix.UUCP>
Date: Thu, 16-Jul-87 19:06:46 EDT
Article-I.D.: felix.3579
Posted: Thu Jul 16 19:06:46 1987
Date-Received: Sat, 18-Jul-87 13:54:41 EDT
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Reply-To: chuck@felix.UUCP (Chuck Vertrees)
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In article  aad+@andrew.cmu.edu (Anthony A. Datri) writes:
>...
>I never dreamed it did ddcmp...  Wow.  A terminal running DECnet:-)  My vt62
>...

DDCMP and DECnet are not the same thing.  

DDCMP is a physical/data link level byte-oriented protocol.  All it is
concerned with is making connections between two (or more) points and 
ensuring that a transmission occurs without error or loss, and in the 
proper sequence.  Other examples of these types of protocols are X.25, 
Ethernet, Bisync, SDLC, HDLC, etc.

DECnet is the much larger body of software layered above the link levels
that provides capabilities like routing, program to program communications,
file transfer, virtual terminals and all the other goodies you have come to
know and love.  DECnet uses DDCMP (or X.25, or Ethernet) to establish and
maintain connections between two physical nodes.

Chuck Vertrees
...hplabs!felix!chuck