. The Bell System technical journal . Fig. 9—-Typical small dial private branch exchange installation. TELEPHONE SYSTEM OF THE UNITED STATES 17 or it may divide into two or more smaller cables branching out eitherunderground or aerially in the area. A type of distributing plant located along the rear properties of aresidential block is illustrated in Fig. 11. This represents the usual O o I < a. 00< —a: CO -Iu < 16 15141312 n 10 1 1 50 PAIF 100 PAIR 1132 PAIF ? .152 PAIf R IE 0 P AIRI di. Jb P MRt 303 PAli b. .c 1 Mh A. 46 5 P \\R- 404 fir PAI6 Pi MR < 6 4 j^f^ 90 9 PAIR Y
. The Bell System technical journal . Fig. 9—-Typical small dial private branch exchange installation. TELEPHONE SYSTEM OF THE UNITED STATES 17 or it may divide into two or more smaller cables branching out eitherunderground or aerially in the area. A type of distributing plant located along the rear properties of aresidential block is illustrated in Fig. 11. This represents the usual O o I < a. 00< —a: CO -Iu < 16 15141312 n 10 1 1 50 PAIF 100 PAIR 1132 PAIF ? .152 PAIf R IE 0 P AIRI di. Jb P MRt 303 PAli b. .c 1 Mh A. 46 5 P \\R- 404 fir PAI6 Pi MR < 6 4 j^f^ 90 9 PAIR YEAR Fig. Fig. 11—-Aerial cable distribution along rear property line. Poles used jointly forelectric lighting power and telephone distribution. 18 BELL SYSTEM TECHNICAL JOURNAL type of construction followed in such areas. With continuous build-ing construction the distributing cables are often attached to the rearwalls as in Fig. 12 or extended through the basements of the cables are carried in conduit consisting of variouscombinations of multiple tile duct. A typical duct run, shown in
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
