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.
