What is TDM?
TDM is a shortened form of time division multiplexing. It is a communication channel that divides single stream into multiple streams based on time. It was developed in 1870 for applications in telegraphy. In this technique, a channel is divided in time slots for specific users. It consists of synchronous TDM and asynchronous TDM. In synchronous TDM, devices are allocated time slots to use communication channel. But in Asynchronous TDM, time slots are flexible because in this technique time slots are based on statistical analysis of number of input lines. That’s why it is also known as statistical time division multiplexing.