. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . lOTrks lOTrks IQTrks lOTrks. Local -*~ Upcoming Znd~&§.= [ selectors .t -+— wot Required I Localcnet - ^Selectors — \lncoming?nd. [Selectors ■ Not Required Fig. 20.—Outgoing secondary lineswitches, 10,000-line, 2-office exchange. The outgoing trunk secondary lineswitch renders all trunks availableto all selectors in a group. (Fig. 20.) At the left are representationsof the first selectors in the first office and their outgoing secondary line-switches. The incoming second selectors of the
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . lOTrks lOTrks IQTrks lOTrks. Local -*~ Upcoming Znd~&§.= [ selectors .t -+— wot Required I Localcnet - ^Selectors — \lncoming?nd. [Selectors ■ Not Required Fig. 20.—Outgoing secondary lineswitches, 10,000-line, 2-office exchange. The outgoing trunk secondary lineswitch renders all trunks availableto all selectors in a group. (Fig. 20.) At the left are representationsof the first selectors in the first office and their outgoing secondary line-switches. The incoming second selectors of the second office are at theright. We are assuming that 30 trunks will handle the traffic whichwould require 50 trunks without the secondaries. For each thousand in the second office we provide three sections ofsecondary lineswitches in the first office. To them we distribute thetrunks from first selectors by levels. Each ten-trunk group is divided as evenly as possible among the threesections of secondaries. This means three lineswitches in one section,three in another section, and four in another sect
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
