What type of transmission uses a clock signal for synchronization?

• A. Synchronous
• B. Asynchronous
• C. Digital
• D. Analog

Answer: (A)

Synchronous transmission utilizes a clock signal to ensure that the sender and receiver are aligned in terms of timing when data is being transmitted. This synchronization allows for the continuous flow of data without the need for start and stop bits, which are typically used in asynchronous systems. In synchronous transmission, both the transmitting and receiving ends operate based on a shared clock signal, meaning that the timing of the data bits is predetermined, facilitating efficient and high-speed data transfer.

In contrast, asynchronous transmission does not rely on a clock signal; instead, it sends data bits individually, often including start and stop bits to indicate the beginning and end of each byte. Digital and analog refer to the type of signal used rather than the method of synchronization. Digital transmission can be either synchronous or asynchronous, while analog signals represent a continuous range of values rather than discrete values like digital signals. Therefore, synchronous transmission is characterized specifically by its use of a clock signal for synchronization, making it the correct answer.