Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!ll-xn!ames!oliveb!felix!chuck 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 References:Sender: daemon@felix.UUCP Reply-To: chuck@felix.UUCP (Chuck Vertrees) Organization: FileNet Corp., Costa Mesa, CA Lines: 21 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