EPLX: A High Level Language for Electronic Switching Systems

EPLX is the first high-level language used within the Bell System in writing Electronic Switching System (ESS) programs. An extension of a predecessor low-level language, it features structured control flow statements and data typing facilities. This paper stresses features of EPLX that allowed it to be incorporated into existing ESS software development tools and methods and into the software structure of an existing project (No. 4 ESS).