. The Bell System technical journal . these, other arrangements must be made. One methodof serving such stations is by means of arrangements similar to thoseof the shorter toll circuits. Generally a telegraph repeater in an officein the vicinity of the subscriber station is used, and transmissionbetween that repeater and the one in the teletypewriter center takesplace in the same manner as over a toll circuit of similar length. TRANSMISSION SYSTEM FOR TELETYPEWRITER 545 Another method for connecting to subscriber stations which cannotbe cared for by a metallic cable pair employs a simple telej
. The Bell System technical journal . these, other arrangements must be made. One methodof serving such stations is by means of arrangements similar to thoseof the shorter toll circuits. Generally a telegraph repeater in an officein the vicinity of the subscriber station is used, and transmissionbetween that repeater and the one in the teletypewriter center takesplace in the same manner as over a toll circuit of similar length. TRANSMISSION SYSTEM FOR TELETYPEWRITER 545 Another method for connecting to subscriber stations which cannotbe cared for by a metallic cable pair employs a simple telej^raph re-peater installed as part of the subscriber station equipment. Thisarrangement as well as the one previously described has the advantagethat it permits polar signals to be used in both directions over the sub-scriber line. In a few cases which have arisen where telegraph facilities were notreadily available between the teletypewriter center and a subscriberstation, use has been made of a single-channel voice-frequency carrier. MARK *i*—SPACE >-«—MARK ■»!«—SPACE —^ f ^[^ r- -MARK >r^SPACE * ^ -SPACE-^ Z
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
