. La rivista tecnica Bell System . ngeles 504 BELL SYSTEM TECHNICAL JOURNAL al momento questo sistema di segnalazione in frequenza vocale isempIoeci per uso regolare sul circuito di Chicago-Los Angeles e altri. Lo stem che impiega corrente a 135 cicli alternatelrelè ed am|)lificato nei punti del ripetitore viene installato anche sui circuiti ecircuiti e prol)al)l l l ill >v conservato per l'uso di emergenza e per modifiche intertemporanee nel layout del circuito. Manutenzione. La continuità dei molti importanti servizi instradati sulle strutture utilizzate per la realizzazione di questi lunghi circuiti dipende dal continuo
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. The Bell System technical journal . ngeles 504 BELL SYSTEM TECHNICAL JOURNAL At the present time this system of voice frequency signaling isempIoeci for regular use on the Chicago-Los Angeles circuit and afew others. The sstem employing 135-cycle current alternatelyrelayed and am|)lified at repeater points also is installed on thesecircuits and prol)al)l w ill >v retained for emergency use and to permittemporary changes in circuit layout. Maintenance. The continuity of the many important servicesrouted over the facilities used in making up these long circuits isdependent upon continuous and efficient maintenance methods andperformance. Coordination of the work of the different offices ismost essential in order to obtain best results, especially on the longerdirect circuits and on those built up by the connecting together ofseveral circuits, as there are a large number of variable factors. Toassist in obtaining best results, accurate records of the circuit make-up TOLL CIRCUIT LAYOUT Ri^CORD Chloago ^J ItOLtogslsa. Fig. 10 from end to end, including a complete description of the types ofequipnuiu and transmission data are prepared and furnished to theterminal and repeater stations. These are made on cards of con-enient size, as illustrated by Fig. 10, which is one of the five cardsfor the Chicago-Los Angeles circuit. To insure proper functioningof the circuit and satisfactory overall transmission and signaling oneof the terminal offices of each circuit is designated as the controllingoffice for that circuit and is responsible for the direction and super- sou/: ihhv i.oxg rr.i.r.riioxr. cincrns 505 vision of tpsts and adjustments riH|iiirtd on tht, - circuit as a whole.In addition to the duties in connection willi the maintenance of th<, circuit as a whole each olTice alonj{ the circuit is responsible, of »-oursc, for the proper physical maintenance of the plant in its territorv. High grade maintenance is necessary to reduce to a minimum, service interru()ti
