Why statistical TDM systems typically use synchronous protocols such as HDLC?

Statistical Time Division Multiplexing (TDM) systems typically use synchronous protocols like High-Level Data Link Control (HDLC) because these protocols provide reliable and efficient data transfer by synchronizing the timing of data frames. Synchronous protocols ensure that the transmitter and receiver are aligned in time, which minimizes the risk of data loss and improves throughput. Additionally, HDLC supports error detection and correction, making it suitable for the dynamic nature of statistical TDM, where bandwidth allocation can vary based on demand. Overall, these features enhance the performance and reliability of data communication in TDM systems.