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 139
a cable is indicated by a letter and a number.The number is that of the bay and the letter is that of the section ofswitches to whose jacks the trunks run. Trunking Devices.—The term trunking devices covers thosearrangements and combinations of trunks which give automatic telephonymuch of its… … 4-Gt-oups of Connectors100 Group JC ?0OGroup 3006roup 400Graup E-g-S? !ecit-Si «s «0 Jo LineswitchesFig. 108.—Party lines, line IDF and grouped connectors. by the makers and part by the users of automatic exchanges. Usually,after describing a device, the way will be shown for carrying it…
Telephone
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