No. 10A Remote Switching System: Control-Complex Architecture and Circuit Design

The purpose of this paper is to give a detailed description of the architecture and circuit design of the No. 10A Remote Switching System (RSS) control complex. The RSS control complex contains the common circuitry needed to communicate with the host ESS and operate the other equipment in the RSS frame (switching network, line interface circuits, transmission channels, service circuits, etc.) as required to perform the functions of detecting originations, establishing and tearing down network connections, ringing telephones, and all of the other basic functions of a telephone switching system. In this capacity, the RSS control complex is analogous to the central control of a conventional ESS, rather than being a simple frame controller. This analogy becomes even more exact when one recognizes that the RSS must, when its connection to the host is severed, operate in a stand419 alone mode, and in this mode the RSS control complex provides the entire intelligence for operating the system. 1.1 Elements of the control complex