. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 73.—Conditions for quad-level trunks. Suppose (Fig. 73) that the total busy-hour traffic from office A tothe four offices numbered 1, 2, 3, and 4 is such that from ten to 20 trunkswill carry it. But because each office is called from a different level onthe selectors at A, it is ordinarily impossible to combine them into onegroup. The plan of quad-level trunks (Fig. 74) permits this desired outgoing trunks are multipled to four levels on the banks of selectors, Infer-office Secffon4 Trun
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 73.—Conditions for quad-level trunks. Suppose (Fig. 73) that the total busy-hour traffic from office A tothe four offices numbered 1, 2, 3, and 4 is such that from ten to 20 trunkswill carry it. But because each office is called from a different level onthe selectors at A, it is ordinarily impossible to combine them into onegroup. The plan of quad-level trunks (Fig. 74) permits this desired outgoing trunks are multipled to four levels on the banks of selectors, Infer-office Secffon4 Trunks.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
