With new combined line-and-recording method, known as CLR all calls are routed to operators who must themselves be able to reach all outgoing toll lines; in larger cities, however, it is not possible to have all toll lines appear in multiple before each CLR operator, so that toll tandem board containing all toll multiple has been developed; board acts as central point in toll office through which operators may secure additional circuits.
Toll tandem switchboard
Bell Laboratories Rec
Bell Laboratories Record ; 8 , n 10
1930
4 pages
4 Figs.
Article (Journal)
English
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Engineering Index Backfile | 1939
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