No. 1 ESS Logic Circuits and Their Application to the Design of the Central Control

Companion articles in this issue 1 2 3 discuss the logical organization and diverse responsibilities of the central control (CC) as t h e primary information processing unit of the No. 1 electronic switching system. This paper has t h e objectives of describing the basic building-block circuits which constitute t h e framework of t h e central control and illustrating their logic design applications in some of the major functional portions of t h e unit. T h e presentation is divided into three parts: Sections I I - V I deal with t h e parameters of the semiconductor devices and the characteristics of the basic circuit in which they are integrated. T h e logical effectiveness of the resultant configuration is demonstrated in Sections V I I and V I I I , which trace its applications from f u n d a m e n t a l designs to some of the more complex, specialized functions required in the CC. Section IX discusses circuit packaging techniques and over-all equipment development as applied to the central control. 2055