. Rivista Bell Telephone . Rifugi, trapani, e la formazione di primo soccorso sono elementi di protezione per i dipendenti in edifici telefonici strategicamente situato controllo del traffico bu-reaus sono costantemente informati tenendo conto delle condizioni di tutti i principali cir-canti. Sono in grado di intervenire prima che si verifichino gravi ritardi. Dalla seconda guerra mondiale, i cavi coassiali con una capacità di molti centesimi di canali, e i sistemi di relè radio con una capacità potenziale come grande asor maggiore del cavo coassiale, sono stati installati su larga scala.uso esteso di questi impianti hasnot solo aumentato traffico-handling ca-pac

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. Bell telephone magazine . Shelters, drills, and first aid training are elements ofprotection for employees in telephone buildings strategically located traffic control bu-reaus are constantly informed regard-ing the condition of all major cir-cuits. They are able to take actionbefore serious delays occur. Since World War II, coaxial cableshaving a capacity of many hundredsof channels, and radio relay systemswith a potential capacity as great asor greater than the coaxial cable, have been installed on a large scale.Extensive use of these facilities hasnot only increased traffic-handling ca-pacities but has provided diversifica-tion of routes and types of equipment.For example, seven separate trans-continental routes, employing all 150 Bell Telephone Magazine AUTUMN BEFORE DISPERSION TOWEST Cll TOLL CIRCUIT ROUTE fLOCAl PLANT FOR(.REACHING TOLL CIRCUITS. Dispersion of telephone transmission facilities is an important factor in the ability tomaintain continuity of service after enemy attack modern types of facilities, provide alarge measure of safety against seri-ous interruptions to essential traffic.Another example is a radio-relaychannel now being constructed fromBoston to Philadelphia and Washing-ton. It will follow a new route, com-pletely by-passing New York City, and will thus make available a sub-stantial number of direct circuitsfrom Washington to the many im-portant military and civilian installa-tions in the New England states, nomatter what might happen in NewYork City. Thoughtful attention is beinggiven to means of avoiding even a temporary loss of all toll services ina large city, even in the event of com-plete destruction of the main toll cen-ters. The general principle followedis to terminate a portion of the tollcircuits in outlying buildings ratherthan in the main toll centers andto provide means of access to thelocal

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