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 131
lOSels. lOSels. lOSels Etc.Fig. 96.—Secondary intermediate distributing frame. SecondaryLine Switches First SelectorBoards Group A Group B Group C Etc … -Bom I :Bay2 .Bay 3 Etc Etc. There are as many first Selector bays as groups of SecondaryLinesw/fches. Each/Lines, itch Sect/on spreads its trunks overthe sections of only one Selector Board. All L.Sw-Sections I toBay I. All L.Siv. Sections 2 to Bay2jetc. Each Selector Bay receivestru nhs from all…
Telephone
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