Accession Number : AD0263144

Title :   DATA LINE TECHNIQUES

Corporate Author : IIT RESEARCH INST CHICAGO ILL

Report Date : 01 APR 1961

Pagination or Media Count : 1

Abstract : The purpose of this contract has been to perform an investigation and study of the techniques and methods necessary for the transmission of digital data over standard telephone circuits in order to establish the basis for an optimum signalling system. This technical report supplies a review of pertinent theoretical material and a survey of wire line digital communication techniques to support suggestions for improving channel utilization. Increased utilization dictates the use of longer code elements in terms of time-bandwidth units, extensive terminal line equalization, and anti-impulse noise techniques. The theoretically optimum encoding-decoding systems based on performance are multilevel differentially coherent PSK (phase shift keyed). (Author)

Descriptors :   *FIELD WIRE COMMUNICATIONS, *MULTICHANNEL COMMUNICATIONS, *TELEPHONE SYSTEMS, CODING, DATA TRANSMISSION SYSTEMS, DIGITAL SYSTEMS, FREQUENCY SHIFT KEYERS, PHASE SHIFT CIRCUITS, TELEPHONE SIGNALS

Distribution Statement : APPROVED FOR PUBLIC RELEASE