Whereas a standard dial-up telephone line uses multiplexing so that multiple signals share the same line, digital T-carrier lines carry only one signal.

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Digital T-carrier lines use Time Division Multiplexing (TDM) to allow multiple signals to share the same line. Each signal is assigned a specific time slot within a frame, and the signals take turns transmitting in their assigned slots.

Whereas a Standard Dial-Up Telephone Line Uses Multiplexing So That