Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 89
this chain circuit is open and calls may be received. Butwhen all trunks are busy, the circuit is complete and the stopping devicecomes into play. A meter may also be attached to indicate how manytimes this occurs, or a supervisory signal may be used. The talking circuit of a connection between… … -L BBR BBR CalledTelephone +z Fig. 69.—Talking circuit of an inter-office connection. from the originating office, and for the called telephone from its ownoffice. It results in a high standard of transmission efficiency. Switching Repeaters.—The desire for economy of inter-office trunksbetween a…
Telephone
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