. The Bell System technical journal . Fig. 6—-Cordless private branch exchange installation for 7 stations and 3 central office trunks. using cords for the completion of connections, is illustrated in Fig. 7with a capacity for fifteen trunks and 200 stations. For the largest private branch exchanges the equipment is of muchthe same type as that used at central offices. A large switchboardfor one of the public utilities having 1,600 stations is shown in Fig. this private branch exchange with the central office thereare 148 lines and in addition 151 tie trunk lines extend to other p
. The Bell System technical journal . Fig. 6—-Cordless private branch exchange installation for 7 stations and 3 central office trunks. using cords for the completion of connections, is illustrated in Fig. 7with a capacity for fifteen trunks and 200 stations. For the largest private branch exchanges the equipment is of muchthe same type as that used at central offices. A large switchboardfor one of the public utilities having 1,600 stations is shown in Fig. this private branch exchange with the central office thereare 148 lines and in addition 151 tie trunk lines extend to other privatebranch exchanges having a business association. There are a totalof 42 switchboard positions. 14 BELL SYSTEM TECHNICAL JOURNAL •m - ■^^Mi % i ■ f 1 ••ti ■-•■••:,L^ III III! II nil k. Fig. 7—Private branch exchange switchboard arranged for 15 trunks and 200 stations.
Size: 1255px × 1991px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
