What are the different types of distributing frames, Electrical Engineering

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Q. What are the different types of distributing frames used in exchanges?

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Different distribution  frames  used  in  exchange  are  displayed in  figure.  Each subscriber in a telephone network is connected generally to the nearest switching office by a dedicated pair of wires. Subscriber loop denotes to this pair of wires.  It would be unwisely to run physically  independent pairs  from  each subscriber premises to exchange. It is far easier to lay cables comprising a number of pairs of wires for different geographical locations and run individual pairs as needed by subscriber premises.

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