File:The Bell System technical journal (1922) (14752837241).jpg

Identifier: bellsystemtechni18amerrich (find matches)
Title: The Bell System technical journal
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company
Subjects: Telecommunication Electric engineering Communication Electronics Science Technology
Publisher: (Short Hills, N.J., etc., American Telephone and Telegraph Co.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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Green and E. I. Green before the American Instituteof Electrical Engineers in 1938, and which is now designated astype K.^ The problems incident to the application of this system totoll cable conductors may be of general interest and it is the purposeof this paper to describe some of these. This description will startat the point where traffic needs have indicated that additional circuitsshould be provided along a given route and economic and other con-siderations have shown that they should be provided by means oftype K cable carrier telephone systems. For specific examples, refer-ence will be made to the New York-Charlotte and Detroit-South Bendprojects, in which sections the application of the initial type K carriersystems has been completed. Figure 1 shows the geographical loca-tion of these installations, as well as some of those sections wheretype K carrier systems will probably be installed in the future. ^ For references see end of paper. 547 548 BELL SYSTEM TECHNICAL JOURNAL
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APPLYING CARRIER TELEPHONE SYSTEMS 549 Selection of Cables to be Equipped Where more than two cables existed on a route selected for carrieroperation, a number of factors influenced the selection of cables to beequipped initially. Among these were the ages of the cables, theirmakeup, specific route, number of branch cables and open wire junc-tions, and lengths of underground cable involved. Between Detroitand South Bend there were but two cables on the route selected andhence no selection was necessary. Between New York and Washing-ton on the New York-Charlotte route all cables are underground, andsince there were from three to six cables in each repeater section, thetwo cables which it was decided to employ were selected because theywere relatively new and had the smallest number of branches. FromWashington to Petersburg, Va., there were two cables, while betweenPetersburg and Charlotte there was but one cable and it was necessaryto install a small second cable chiefly for carrier op

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