The Information Driveway

mission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Abstract Regular analog telephone lines can be directly connected through the telephone network to ISDN terminals. By using appropriate modulation formats, they can carry digital traac at rates approaching those of ISDN, without extra recurring costs for the customers, or new investments in the network. Such a system thus provides an aaordable and universal "driveway" to information services. This paper explains the basic concepts and reports on some measurements that show their feasibility. \The fundamental problem of communication is that of reproducing at one point ...] a message selected at another point."