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 34
it renders useless not more than one trunk from eachprimary board or section. This arrangement may be seen in both kinds of lineswitches. If weconsider any primary lineswitch, we shall see that it has a choice of tentrunks, any one of which will serve equally well. It has to share thischoice with… … Fig. 17.—Primary and secondary trunking (distributive). 18 A U TOM A TIC TELEPHON Y through its primary lineswitch, has seized one of the ten trunks, it isthus extended to a lineswitch on one of the secondary boards. Herdagain it has a choice of ten trunks any one of which will serve equallywell.…
Telephone
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