A report on some characteristics of impulse noise in telephone communication

For the past few years, Bell Telephone Laboratories has been conducting an intensive study of impulse noise in switched telephone networks in order to define the statistical character of impulse noise and evaluate its impairment of digital data transmission. The study has progressed to the point where some significant parameters of the noise have been identified and sufficient data gathered on these parameters to show their variability and the boundaries of the variability. This paper presents a summary of the results to date. The study concentrated on noise in 3-kc-bandwidth circuits and the results are limited to such facilities.