Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 675
plug con-tacts ; hence the designation of their various; distributing frame ter-minals, T, R S. The wires leading from the main to the intermediate distributingboard are usually grouped in 21-pair cables, 20 pairs being theunit of wiring throughout the exchange from the arrester side ofthe main… … 653 654 AMERICAN TELEPHONE PRACTICE. mediate distributing frame to the first multiple section of the switch-board, the wires serving the 20 lines are grouped into a 63-wirecable, this cable consisting of 21 twisted pairs serving the tip andring contacts of the jacks, and 21 single wires serving the…
Telephone
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