. The Bell System technical journal . ght to be possible with the jacks having differentfunctions located at different test board positions. In this way allof the line conductor jacks, for example, may be assembled togetherin consecutive order, and since several hundred of these may be in-volved in a single installation, this should greatly facilitate the identi-fication of the desired circuits by the attendant in the process ofpatching and testing. This grouping of the jacks will also effect asaving in testing equipment, since it will eliminate the need of the linetesting apparatus, such as t
. The Bell System technical journal . ght to be possible with the jacks having differentfunctions located at different test board positions. In this way allof the line conductor jacks, for example, may be assembled togetherin consecutive order, and since several hundred of these may be in-volved in a single installation, this should greatly facilitate the identi-fication of the desired circuits by the attendant in the process ofpatching and testing. This grouping of the jacks will also effect asaving in testing equipment, since it will eliminate the need of the linetesting apparatus, such as the Wheatstone bridge, at positions wherethe line conductors will not appear. 126 BELL SYSTEM TECHNICAL JOURNAL Fig. 13 illustrates both the open-wire and the proposed cablemethods of grouping the jacks. In the arrangement for open-wirecircuits the jacks associated with both the lines and equipment arelocated adjacent to each other in the same test board panel. Incable installations the jacks having similar functions are to be grouped. Fig. 13—Typical Jack Assembly Arrangements at Test Board together, the groups having different functions being mounted indifferent panels which may be located in different test board posi-tions. These various groups, in the latter case, are planned as follows: 1. Primary line testing position for testing and patching tolllines only. This position to be used for locating faults in thecable circuits and equipped with a Wheatstone bridge and volt-meter, to permit the necessary electrical measurements for thispurpose. This position is also to be used for making temporarychanges in the assignments between the lines, and the equipmentas a whole, but is not to be arranged to permit changes in in-dividual equipment units, such as composite sets, phantomsets, etc. The jacks to be located at this board are to includethose designated as line jacks and equipment jacks, inFig. 12. 2. Secondary terminating line positions for testing and patchingthe lines betw
Size: 2107px × 1186px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
