Which data transmission type is determined using a clock?

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

Answer: (B)

The correct choice is synchronous data transmission. In synchronous transmission, data is sent in a continuous stream along with a clock signal that ensures both the sender and receiver are synchronized with each other. This means that the devices involved in the communication use the shared clock to manage when data bits are sent and received, thereby allowing for higher data rates and more efficient communication.

In contrast, asynchronous transmission does not rely on a shared clock signal; instead, it uses start and stop bits to signal the beginning and end of each byte or character. This can lead to inefficiencies, especially in high-speed communications. Isosynchronous transmission, while using a clock signal, is generally used in specific scenarios and is less common for general-purpose data communication. Digital transmission simply refers to the method by which data is encoded and does not inherently define whether a clock signal is used or not.

Thus, synchronous transmission stands out as the one that requires a clock signal to ensure that data is transmitted accurately and at a consistent rate.