Register equipment for a time-division-multiplex electronic telephone exchange

Register equipment has been designed for use in a time-division-multiplex electronic telephone exchange. Calls using the register do so by means of trains of pulses occurring at different times in a cycle but on a single common highway. Information is therefore stored and processed using the same pulse positions. Storage and logical gating circuits are thus time shared among all calls being set up at any period. The stores comprise magnetostrictive delay lines and the logical circuits use diode-resistor gates and transistor buffer amplifiers. The operations performed by the register equipment for setting up various types of call are described in detail. The method used for providing continuity of service under fault conditions is explained and the mechanical design of the equipment is described. The provision of registers for exchanges of different sizes is also discussed.