Pentaconta 32 telephone switching system for rural networks

A detailed description of a current rural crossbar system. Basic objectives of the system are maximum flexibility, allowing extensions in steps of 32 lines up to 3000 lines, wiring simplification, efficient use of the switching matrix on local and incoming calls, and simplification of control. Other objectives in the design were simplicity of operation, short installation and testing time, minimum and rapid maintenance and long life. The system lay-outs for single and two stage versions are described with schematic and block diagrams. The mechanical design makes use of many practical concepts to facilitate installation, such for example as the use of plug-in units and prefabricated cable harnesses.