What is Time Division Multiplexing (TDM) Switching?
Time Division Multiplexing (TDM) Switching is a type of digital multiplexing where two or more channels are derived from a selected frequency spectrum. In circuit switched networks such as that of the Public Switched Telephone Network (PSTN) there is the need to transmit multiple users’ calls across the same transmission line. This is done by time division multiplexing switching, this is distinguished from packet switching by the fact that time slots are pre-allocated to the channels. Time division multiplexing switching allows the switches to create multiple channels on the line allowing for multiple users to use the same medium. A typical voice signal will have a bandwidth of 64kbps, time division multiplexing switching will multiplex the voice signal into a TDM frame. With multiple voice samples there will be multiple frames which will require a higher bandwidth than that of 64kbps, the bandwidth of the system will need to be enough to hold n voice frames, so the bandwidth will need
