. The Bell System technical journal . ports as the testing equipment. The mountings are to be attachedto the supports by fasteners, each occupying a vertical space of l^iinches and drilled to fit the usual drillings in the supports. This willpermit the close association of the jacks with the desired testing ap-paratus. It will also be possible, by this means, to use for the jacksonly such of the available vertical space as may be desired, the re-mainder being used for other equipment, thereby effecting economyin the use of the space. The arrangement is thus expected to be ad-vantageous both in
. The Bell System technical journal . ports as the testing equipment. The mountings are to be attachedto the supports by fasteners, each occupying a vertical space of l^iinches and drilled to fit the usual drillings in the supports. This willpermit the close association of the jacks with the desired testing ap-paratus. It will also be possible, by this means, to use for the jacksonly such of the available vertical space as may be desired, the re-mainder being used for other equipment, thereby effecting economyin the use of the space. The arrangement is thus expected to be ad-vantageous both in large installations, where, the various groups of 130 BELL SYSTEM TECHNICAL JOURNAL jacks are desired to be arranged at separate primary and secondarypositions, and in small installations in which but a few jacks may berequired for all purposes. Fig. 18 shows the proposed assembly of a typical panel equippedwith voltmeter, telegraph relay and sounder, such as are usuallymounted above the jack field. The advantage of using the panel. TELEGRAPH RELAY- Fig. 18—Typical Assembly of Apparatus Panel for Panel Mounted Test Board mounting for this equipment is expected to be the same from the stand-point of convenience and economy as that obtained from this methodof mounting the keyshelves in relation to the various jack fields. Itwill permit the location of this equipment at any desired position andeliminate duplication at positions where this apparatus is not neces-sary. It will also permit flexibility in regard to the type of panel as-sociated with a given jack field. Signaling Equipment The principal purposes of the signaling equipment in telephonelines are (1) to permit a subscriber to signal the central office opera-tor, as he does automatically in removing the receiver from the switch-hook, (2) to permit the central office operator to ring the subscribersbell and (3) to permit the operators at different central offices to signaleach other. At repeater stations this equipment s
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
