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 48
ion will constitute a sub-office. (Fig. 31.) There will be twokinds of trunks, outgoing trunks from the sub-office and incoming trunksto it. The outgoing trunks run from the banks of the lines witches orthe wipers of finder switches and terminate in first selectors in the mainoffice. The incoming… … Fig. 31.—Sub-office trunking. In order to reduce the number of trunk wires required between thebanks of the lineswitches or the finder switches and the first selectors inthe main office, it has been customary to install a repeater in the sub-office between the lineswitch bank and each outgoing…
Telephone
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