The 10-C System, a Stored-Program Controlled Reed Switching System

The 10-C telephone switching system comprises modular multistage link switching networks composed of reed crosspoint matrices, controlled by a stored-program controlled central processor system. In addition to the advantages inherent in the use of sealed contacts, such as high transmission quality, low noise, long life, etc., the following useful system features are obtained: high switching speed, high crosspoint efficiency, optimum match between network and central control, efficient path search and marking procedures, easy extensibility, and integrated quasi-electronic plug-in mounting techniques. The 10-C central processor system is mainly composed of integrated circuit logic and ferrite memory features: high speed, simplicity, compact construction, and high intrinsic reliability. Common storage in extensible randomaccess ferrite memory is provided for program instructions, and translation and parameter tables, as well as variable call data. The duplicate processors working in the load-sharing mode are complemented with a program-reload and automatic recovery system. The first exchange of this type was handed over to the Belgian administration in 1967 and integrated in the Antwerp area automatic telephone network.