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 150
) is increased from ten trunks to 30trunks. If we consider any given shelf the switches of which are multipled toeach other point-for-point (i.e., without bank slip), we will see thatwhenever a switch seeks an idle trunk it will stop on the first one whichis found disengaged. This means that the… … Fig. 126.—Common trunks added to individual trunks, ELS-15. that from 50 to 75 per cent of all the calls handled by a fairly busy groupof ten trunks are handled by the first three trunks. From this we may draw the very natural conclusion that individualtrunks offer a powerful remedy to relieve…
Telephone
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