. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 76 BELL SYSTEM TECHNICAL JOURNAL Problem III In practice, a modification of Problem II frequently arises. As- sume an arrangement similar to that of Problem II except that the number of lines is multiplied by a factor of perhaps 3 or more, each line switch, however, still having access to all first selectors. The required number of first selectors will also be larger but not in ex- actly the same ratio because the margin of idle selectors need not be relatively as grea
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 76 BELL SYSTEM TECHNICAL JOURNAL Problem III In practice, a modification of Problem II frequently arises. As- sume an arrangement similar to that of Problem II except that the number of lines is multiplied by a factor of perhaps 3 or more, each line switch, however, still having access to all first selectors. The required number of first selectors will also be larger but not in ex- actly the same ratio because the margin of idle selectors need not be relatively as great in the large system as in the small. An enlarged group of trunks running from the first selectors to the second selectors will now be required, and it will be assumed that there are four times Tb Lines & Line Switches. + 10 Trunks to Second Selectors FinstSelectors t 04 Fig. 4 as many trunks coming from each level of the first selectors as there are points of contact on each level. To meet this situation, the first selectors and their outgoing trunks are divided into four sub- groups as shown in Fig. 4. The corresponding sub-groups of second selectors are designated by d, G2, G3, G4, the number of trunks to each sub-group being 10. The solution of this problem depends primarily on the manner in which the line switches distribute calls to the first selectors. Three cases will be Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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