Which statement best distinguishes synchronous from asynchronous signal data?

Which statement best distinguishes synchronous from asynchronous signal data?

• A. Synchronous uses an associated clock, asynchronous does not
• B. Synchronous is always slower
• C. Synchronous uses analog signals, asynchronous digital
• D. Synchronous is always open-loop

Answer: (A)

The key idea is timing coordination. Synchronous signal data uses a shared clock that runs through the transmission, so sender and receiver sample data at fixed, predictable times. That clock ties the pace of the data stream and enables continuous, high-throughput transfer with minimal framing. Asynchronous data, on the other hand, does not rely on a continuous clock; each character is sent with its own start and stop indications, and the receiver uses its own timing to sample between those events. This framing makes asynchronous better for irregular or sporadic data but adds overhead and variability in timing. So the best statement is that synchronous uses an associated clock, asynchronous does not. The other choices miss the central timing difference: speed isn’t fixed by the method, the digital/analog nature isn’t defined by synchronous versus asynchronous, and open-loop versus closed-loop isn’t the defining factor here.

The key idea is timing coordination. Synchronous signal data uses a shared clock that runs through the transmission, so sender and receiver sample data at fixed, predictable times. That clock ties the pace of the data stream and enables continuous, high-throughput transfer with minimal framing. Asynchronous data, on the other hand, does not rely on a continuous clock; each character is sent with its own start and stop indications, and the receiver uses its own timing to sample between those events. This framing makes asynchronous better for irregular or sporadic data but adds overhead and variability in timing.

So the best statement is that synchronous uses an associated clock, asynchronous does not. The other choices miss the central timing difference: speed isn’t fixed by the method, the digital/analog nature isn’t defined by synchronous versus asynchronous, and open-loop versus closed-loop isn’t the defining factor here.