ARRL Technician Practice Exam

What is an ARQ transmission system?

1. A digital scheme for fast transmission

2. A digital scheme whereby the receiving station detects errors and requests retransmission

3. A system for analog signal processing

4. A method of amplitude modulation

The correct answer is: A digital scheme whereby the receiving station detects errors and requests retransmission

An ARQ (Automatic Repeat reQuest) transmission system is defined by its capability to enhance the reliability of data communication. In this context, it enables the receiving station to identify errors in the received data. When an error is detected, the receiving station sends a request back to the transmitting station to resend the erroneous data. This process ensures that the data remains accurate and intact during transmission, which is particularly crucial in digital communications where preserving the integrity of information is paramount. This system is widely utilized in various data communication protocols, making it a vital aspect of modern telecommunications. The efficiency and effectiveness of ARQ methods help maintain high levels of data integrity, which is essential for applications ranging from simple messages to complex data transfers. The other options do not correctly describe the ARQ system. While fast transmission and digital schemes are important in networking, they do not specifically define the error detection and retransmission mechanism that ARQ offers. Analog signal processing and amplitude modulation pertain to different concepts altogether, related more to the manipulation of signals rather than error management in data communication.