. The Bell System technical journal . ■D -= Z3 tf Jj S 5 o) ro£ E <uE- x; fc o If o B E SB 1 E3J ;S fl. H tfLUJ3|JW I m PRACTICAL APPLICATION OF CARRIER SYSTEMS however, and this may prove out the further addition of if it appears economical to install additional carrier systems, apoint will soon be reached where the cumulative annual charges ofthe carrier systems will exceed that ot the cable. The first few sys-tems prove in over the (-able because the carrier provides only for theimmediate circuit requirements while the cable must take care ofgrowth and therefore includes man
. The Bell System technical journal . ■D -= Z3 tf Jj S 5 o) ro£ E <uE- x; fc o If o B E SB 1 E3J ;S fl. H tfLUJ3|JW I m PRACTICAL APPLICATION OF CARRIER SYSTEMS however, and this may prove out the further addition of if it appears economical to install additional carrier systems, apoint will soon be reached where the cumulative annual charges ofthe carrier systems will exceed that ot the cable. The first few sys-tems prove in over the (-able because the carrier provides only for theimmediate circuit requirements while the cable must take care ofgrowth and therefore includes many idle facilities when first in-stalled. Where carrier is used to provide facilities in place of a tollcable it should always be considered an intermediate and temporarystep between open wire and cable plant. The use of carrier as outlined above may effect further economiesafter the apparatus has been removed as the equipment may bereused at some other point to advantage. A typical example of theuse of carrier apparatus to defer a cable is the Boston-Bangor carriersystem which was put in to defer the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
