Digital Computer Simulation of a Four-Phase Data Transmission System

l.i Mature of Simulation and of the Telephone Plant Digital computer simulation cau be a powerful tool in the study of d a t a transmission systems. This paper begins with a discussion of the techniques t h a t have proved useful in applying this tool to various d a t a transmission systems, including a new technique for studying the effects of impulse noise. These methods are then used for a detailed simulation study of a four-phase d a t a transmission system. Digital computer simulation, in general, aims at studying some physical system by a mathematical model of the system on a digital computer. In particular we are concerned with a real d a t a transmission system in a real telephone plant. T h e scope of this paper is t h u s the performance of d a t a systems over a time-stationary transmission path chosen at random from an ensemble of such lines. T h e m a j o r forms of interference which concern us are this time927 928 T H E B E L L SYSTEM TECHNICAL J O U R N A L , MAY 1 0 ( 5 4