Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!ucsd!ucbvax!NJITC.NJIT.EDU!hxn8477%njitx.decnet From: hxn8477%njitx.decnet@NJITC.NJIT.EDU ("NJITX::HXN8477") Newsgroups: comp.protocols.misc Subject: Personal protocols: Where do they fit in the big picture? Message-ID: <8810240404.AA07009@rutgers.edu> Date: 24 Oct 88 05:02:00 GMT Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: "NJITX::HXN8477" Organization: The Internet Lines: 36 PERSONAL PROTOCOLS: WHERE DO THEY FIT IN THE BIG PICTURE People have been asking me this question. Personal protocols (such as kermit, xmodem, ymodem, modem, tlink, sealink, link, cis a, cis b, cis , etc..etc.(where banana = any thing)), where do they fit in the ISO reference model? I say, well. If you are calling a node over the phone network, as opposed to a packet switching network, then they represent the link layer protocol. That is because they insure safe data transfer over the logical link between the two calling points. An example here is if you transfer data to or from a BBS. But if you are calling a node over a packet switching network, then they represent the transport layer. That is because they insure end-to-end error and flow control. An example here would be transfering data with Compuserve over its proprietary net or over Telenet or Tymenet. While the link and network protocols are provided by the PSN, the protocol you use provides the transport layer protocol. .;;;. .. /\ //^|^\\ .'..; / \ /\ | _/~~\_.'.' / \/ \ /\ | ,(_ ) "Blanked until further notice" / \ \/ \ | ' \~~~|' / \ \ \ | | | +---------------------------+------------------------------------------------+ |Hamed Nassar |Internet : hxn8477%njitx.decnet@njitc.njit.edu | |EE Department |UUCP : bellcore!argus!mars!nancy | |NJ Institute of Technology |CompuServe: 74000,130 | +---------------------------+------------------------------------------------+ ------