Telephone Engineering » Exercise - 1 1. A condition of a telephone handset, in which it can be called, is _______ condition. (a) on-hook (b) off-hook (c) busy (d) none of these
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Telephone Engineering » Exercise - 112. A trunk is : (a) the base of a communication tower (b) a telephone line connecting two C.O.’s (c) a line connecting one telephone set to the PABX (d) the structure where antenna are attached
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