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 342
in B) will not be equipped with outgoing trunk multiples.Thus, while local lines (in B) can call exchange C, a call from A into Bcan not get the out trunk to C and tandem trunking is impossible. Thesubscriber in A must call the controlling exchange, whose toll operatorcan make the record and… … R Exchanqe-C(2>) —E— n— Jo Local SwitchesI-A I-D I-M Fig. 271.—Typical network of community automatic exchanges. matic exchanges, each limited to 1000 lines. The principles shown canbe applied to exchanges of any size. Four of these automatic exchanges (Fig. 271), A, B, C, and D, aresupposed to…
Telephone
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