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TDM Stand for Time Division Multiplexing, a type of multiplexing that combines data streams by assigning each stream a different time slot in a set. TDM repeatedly transmits a fixed sequence of time slots over a single transmission channel. Within T-Carrier systems, such as T-1 and T-3, TDM combines Pulse Code Modulated (PCM) streams created for each conversation or data stream. IP telephony is telephony. However, if we look at it, nobody today invests in TDM technologies anymore. Pretty much all the R&D investments are directed towards IP based communications. This is simply because IP enables a lot of things for customers and they derive many benefits that traditional telephony doesn't offer them.

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