What is the maximum length of a USB cable for optimal performance?

The maximum length of a USB cable for optimal performance is 5 meters (16.4 feet). This is because USB technology, particularly the common USB 2.0 specification, is designed to maintain signal integrity and data transfer rates over that distance. Beyond 5 meters, the risk of signal degradation increases, which can lead to data corruption or slower transfer speeds.

USB can technically operate over longer distances with the use of active extension devices or hubs, but these methods go beyond the simple use of passive cables. The 5-meter specification serves as a guideline for users to ensure reliable connections without experiencing issues related to attenuation or interference, making it suitable for most typical applications in computer systems and peripheral connections. This standard helps to ensure that users can maintain a stable and fast connection while adhering to industry practices.