. American telephone practice . hange. This picture was takenbefore all the cables were drawn in. This vault is under the side-walk in front of the building, and communicates directly with themain cable run leading to the second floor. Fig. 494 shows a view of the cable run at a point where thecables turn from a horizontal to a vertical direction, after whichthey extend through a narrow cable shaft to the second floor, this CENTRAL OFFICE EQUIPMENTS. 685 shaft being approximately 20 feet long by 8 inches wide. Therewere at the time this view was taken thirty-two 300-pair cables inthis run, thu
. American telephone practice . hange. This picture was takenbefore all the cables were drawn in. This vault is under the side-walk in front of the building, and communicates directly with themain cable run leading to the second floor. Fig. 494 shows a view of the cable run at a point where thecables turn from a horizontal to a vertical direction, after whichthey extend through a narrow cable shaft to the second floor, this CENTRAL OFFICE EQUIPMENTS. 685 shaft being approximately 20 feet long by 8 inches wide. Therewere at the time this view was taken thirty-two 300-pair cables inthis run, thus giving a cable capacity of 9,600 lines. The floor plan of the terminal room is shown in Fig. 495, andfrom this it will be seen that the main distributing frame andrelay rack and the intermediate frame are .mounted side by sidein accordance with the method of construction already referred main frame occupies a position alongside of the cable shaft, andthe line cables, after being terminated in pot-heads, are extended to. FIG. 498.—POWER PLANT—LOS ANGELES OFFICE. the various line terminals of the main frame. The lead-coveredcables leading up through the shaft are bent around a quarter-roundgrooved beam at the level of the terminal room floor. This supportsthe cables in the shaft, and from this support the cables extend ina horizontal direction to the main distributing frame terminals. A good idea of the arrangement of the frames may be had fromFig. 496, the main frame being on the left, the intermediate frameon the right and the relay rack in the middle. This view is taken from the front end of the building lookingtoward the rear. In Fig. 497, the opposite ends of the distributing and relay 686 AMERICAN TELEPHONE PRACTICE. frames are shown, this view also showing a general view of thepower plant and power switch-board. In the center of this view,supported by iron posts, is shown a cable run leading from theend of the intermediate distributing frame, by means of which
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
