Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!samsung!think.com!spool.mu.edu!uunet!hayes!tnixon From: tnixon@hayes.uucp Newsgroups: comp.dcom.modems Subject: Re: Cellular phones and modems Message-ID: <3941.282fcaeb@hayes.uucp> Date: 14 May 91 11:32:59 GMT References: <0JPu22w163w@isishq.fidonet.org> Organization: Hayes Microcomputer Products, Norcross, GA Lines: 31 In article <0JPu22w163w@isishq.fidonet.org>, evanc@isishq.fidonet.org (Evan Champion) writes: > I was curious to know if it is possible to set up a modem on a cellular > phone (in the same fashion as a normal phone line). Would I need any > special cabling, etc.? Thanks. Yes, it is possible to hook a standard modem up to a cellular phone. A V.22bis modem works pretty well if you're stationary, but an echo cancelling modem (like V.32) will have problems. Of course, it's advisable to use error control. CCITT Study Group XVII is currently studying the issue of data transmission on analog cellular networks, including the possibility of standardizing special modulation schemes and/or forward error correction to improve block error rates, but many participants believe that such extraordinary measures are not necessary. You do need a special interface to the phone. These are sold by several companies, under license from a company called Tellular. The Tellular box provides a standard RJ-11 modular connector into which you plug the modem. Other than this, the only thing you need to worry about is providing power; you're probably best served by getting a modem that runs off batteries, although some are now available that will run off a plug in the cigarette lighter. Of course, an internal modem inside your laptop would work fine, too. -- Toby Nixon, Principal Engineer | Voice +1-404-840-9200 Telex 151243420 Hayes Microcomputer Products Inc. | Fax +1-404-447-0178 CIS 70271,404 P.O. Box 105203 | UUCP uunet!hayes!tnixon AT&T !tnixon Atlanta, Georgia 30348 USA | Internet hayes!tnixon@uunet.uu.net