. American telephone practice . small villages the branchexchanges. 170 TELEPHONE EXCHANGE IN GENERAL. 171 It is usual to have the subscribers in a certain community, orwhere this is too large, in a certain portion of the community, con-nected by means of telephone lines with a certain central point, atwhich apparatus is provided for inter-connecting lines in accordancewith the wishes of the subscribers. Such a central establishment isusually called a central office, or a telephone office. May we not thendefine as follows: A telephone office is an establishment in which telephone linescenter,
. American telephone practice . small villages the branchexchanges. 170 TELEPHONE EXCHANGE IN GENERAL. 171 It is usual to have the subscribers in a certain community, orwhere this is too large, in a certain portion of the community, con-nected by means of telephone lines with a certain central point, atwhich apparatus is provided for inter-connecting lines in accordancewith the wishes of the subscribers. Such a central establishment isusually called a central office, or a telephone office. May we not thendefine as follows: A telephone office is an establishment in which telephone linescenter, containing equipment for interconnecting the lines. A telephone exchange is an organization of one or more telephoneoffices and the connecting lines and sub-station equipments necessaryfor supplying telephone service to a community. Under these definitions a telephone exchange may consist of oneor more telephone offices. A telephone office may in itself form theonly means of connecting the subscribers in an entire exchange, or. o FIG. 151.—SINGLE-OFFICE EXCHANGE. it may form the center of the lines of only one group of subscribersin an exchange. Where there are more offices than one in an exchange, lines mustbe provided extending between them to afford a means for connect-ing a subscribers line terminating at one office with the line of asubscriber terminating at another office. The simplest form of an exchange is that containing but one cen-tral office, this office being isolated so that no means is providedfor connecting it with other offices. Such an exchange may be repre-sented diagrammatically as in Fig. 151, wherein a large circle in thecenter represents the central office, the small circle surrounding itrepresents the subscribers stations or sub-stations, as they are morecommonly called, and the lines connecting the large circle with therespective small circles, the subscribers lines. In Fig. 152 is shown an exchange having two central offices, each 172 AMERICAN TELEPH
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