Accession Number : ADP005255

Title :   Station-Generated Impulse Noise and Its Effects on a T1 Carrier Signal,

Corporate Author : AT AND T BELL LABS NORCROSS GA

Personal Author(s) : Haber,J. B.

Report Date : NOV 1986

Pagination or Media Count : 5

Abstract : Studies dating back to 1963 emphasize the importance of considering the effects of impulse noise coupled by near end crosstalk (NEXT) as a predominant source of digital transmission error in T1 systems. Relays and switches, rectifier power supplies, ac power wiring, lines carrying test tons, and ringing generators in central offices and remote terminals have all been implicated as impulse noise sources. This study demonstrates that station-generated impulse noise can also be a problem. For instance, when the ringing signal is interrupted on a voice pair in the same cable, the disturbances can be at least 20 dB stronger than intersystem NEXT. While such strong impulses are infrequent, they may be of concern as the DS1 service to customer premises continues to expand. A simple, parallel R-L filter placed in series with a standard telephone set effectively reduce errors in the transmitted data. (Author)

Descriptors :   *NOISE, *TELEPHONE SIGNALS, MOMENTUM

Subject Categories : Cybernetics
      Command, Control and Communications Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE