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 278
vided with one or more keyboards through whichimpulses generated by the sending machine can be delivered to theswitches in such a manner as to set up the connection. After the connec-tion has been established the operators apparatus is disconnected sothat it may revert to common use. The order of… … To Keyset Switch To Secondary Selector Fig. 222.—Subscribers line and distributor circuits. the third digit operates the. ringing selector and the fourth and fifth digitsoperate the connector. Details of Circuits.—The subscribers lines (see Fig. 222) have line andcut-off relays. All of the line…
Telephone
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