Stored Program Controlled Network: NO. 1/1A ESS-SPC Network Capabilities and Signaling Architecture

Abstract

The No. 1/1A Electronic Switching System (ess) will play an important role in the evolving Stored Program Controlled (spc) Network because, as a major electronic switching system for local and combined local/toll service, it provides direct interfaces to many of the Bell System's customers. It provides important capabilities required for System 800 Service and for a variety of other new spc network services. This paper describes several of the basic spc network capabilities provided by the No. 1/1A ess. It also describes the architecture and implementation of its common‐channel interoffice signaling (ccis) subsystem, ccis call‐processing software, and System 800 software.