Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!samsung!think.com!mintaka!bloom-beacon!eru!hagbard!sunic!nuug!ifi!enag From: enag@ifi.uio.no (Erik Naggum) Newsgroups: comp.protocols.iso Subject: Re: Question on Layer1-Layer2 Interface Message-ID: Date: 1 Nov 90 06:54:15 GMT References: Sender: enag@ifi.uio.no (Erik Naggum) Organization: Naggum Software, Oslo, Norway Lines: 33 Nntp-Posting-Host: hild.ifi.uio.no In-Reply-To: josef@nixdorf.de's message of 29 Oct 90 08:44:37 GMT Originator: enag@hild In article josef@nixdorf.de (Moellers) writes: Questions: 1. Is this dialing part of ISO layer 1 (physical layer)? In my opinion, it is. In my opinion, it's part of a primitive Network Layer. 2. How do I specify the address/numbers to use? Have you tried a sequence of digits? :-) Seriously, being part of the Network Layer, I would guess you could construct some Network Service Access Point address which would conveniently map to the telephone number. Note: By putting connection establishment into the Network Layer, you can use different Data Link protocols for connection establishment and release than for data transfer, since you talk to the modem. I'm almost of the opinion that you could construct a whole seven-layer model for dialling and phone protocols. They did it with Digital Subscriber Signalling system # 1 and Signalling System # 7, yet I routinely view the dialling and the phone connection as pretty low-level. Moral: The ISO RM for OSI applies from several angles of view. -- [Erik Naggum] Naggum Software; Gaustadalleen 21; 0371 OSLO; NORWAY I disclaim, , therefore I post. +47-295-8622, +47-256-7822, (fax) +47-260-4427 --