Some applications of square-loop ferrite cores in telecommunication switching circuits

Abstract

After an introductory discussion of the importance of electronic switching for certain functions in telephone and telegraph exchanges, the paper sets out the principles of switching with square-loop ferrite cores and the advantage of their use in combination with transistors.Various examples are given of the use of square-loop ferrite cores in telecommunication switching circuits. They refer particularly to electronically controlled telephone exchanges (register, impulse generators, counting circuits, code convertors), a multi-metering system for telephone exchanges, a memory circuit for the storage of telegraph characters and finally an automatic reservation system for airline companies.