. American telephone practice . 622 DISTRIBUTING FRAMES. 623 In modern exchanges of sufficient size to employ multiple switch-boards an intermediate distributing frame should be provided, andthe circuits leading from the switch-board side of the main frameshould lead through this before passing to the switch-board proper. The function of the intermediate distributing frame is this: Itaffords means for changing the relation between the answering jackwith lamp and the multiple jacks on any line. Unless a change is.

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