The new line concentrator no. 1A

A description is given of the new Line Concentrator No. 1A, covering its features, the new magnetically latching crossbar switches and relays, the switching networks, and the method of operation. This equipment will serve 50 or 100 lines over ten or 20 trunks, with two control pairs in either case, and can be used in almost any type of central office The working limits, field of use, administration, maintenance, and economics are discussed.