What is an ARQ transmission system?

• A. An error detection method
• B. A type of compression algorithm
• C. An error correction method with retransmission request
• D. A protocol for high-speed data transfer

Answer: (C)

An ARQ (Automatic Repeat reQuest) transmission system is specifically designed to enhance data integrity in communications by allowing for error correction through retransmission. When a sender transmits data, the receiver checks it for errors. If the data is found to be corrupted or lost, the receiver sends a request back to the sender for retransmission of the affected packets. This continuous checking and requesting process helps to ensure that the information is received correctly, improving the reliability of data transmission.

In contrast, the other options either focus on different aspects of data handling or do not encompass the retransmission component integral to ARQ systems. Error detection methods identify that an error has occurred but do not include a mechanism for correcting it through retransmission. Similarly, a compression algorithm reduces data size for transmission but does not address error management. A protocol for high-speed data transfer encompasses a broader range of technical specifications and does not specifically involve the error-correction capabilities unique to ARQ systems. Thus, the emphasis on error correction with a request for retransmission distinctly categorizes ARQ as a specialized transmission system focused on reliable data communication.