. Bell telephone magazine . Figure 6. Selector Frame and Relay Equipment for Miscel-laneous o Ph LARGE CAPACITY MANUAL selectors by dialing 9 followed in dial areas by the numberlisted in the telephone directory or in manual areas by givingthe call to the central office operator. The step-by-step switches of the various kinds and the relayequipment for the miscellaneous circuits are mounted on single-sided frames and these frames, as well as the distributingframe, are uniform in height and somewhat higher than thosepreviously employed in dial private branch exchanges. Thisdesign of
. Bell telephone magazine . Figure 6. Selector Frame and Relay Equipment for Miscel-laneous o Ph LARGE CAPACITY MANUAL selectors by dialing 9 followed in dial areas by the numberlisted in the telephone directory or in manual areas by givingthe call to the central office operator. The step-by-step switches of the various kinds and the relayequipment for the miscellaneous circuits are mounted on single-sided frames and these frames, as well as the distributingframe, are uniform in height and somewhat higher than thosepreviously employed in dial private branch exchanges. Thisdesign of the framework permits efficient use of the customersfloor space, provides a convenient arrangement for wiring andcabling between frames and facilitates maintenance work. The power plant may be called the heart of the privatebranch exchange since it furnishes battery supply, ringingcurrent, tones, signals and maintenance alarms and is, of course,a most important part of these systems. It consists principallyof a storage battery, charging equipment, ringing and tonemachines and a power board. The ch
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
