*2.4.1 Synchronous time division multiplexing*

In synchronous TDM the slots are arranged in a round robin manner, i.e., if there are n sources, then a single frame consists of n time slots, and each time slot is dedicated to exactly one source for carrying data from the corresponding input. Each source places its data to the link only when the corresponding slot arrives. In synchronous TDM, if a device does not have data to send, then its time slots remain empty. The transmission of data with synchronous TDM is shown in **Figure 9**.
