What is the purpose of shielding in a cable?

The purpose of shielding in a cable is primarily to reduce electromagnetic interference (EMI). Shielding is a protective layer that surrounds the inner conductors of the cable, serving to block or attenuate external electromagnetic fields. This is particularly important in applications where sensitive signals are transmitted, as interference can lead to signal degradation, data loss, and other functional issues.

Electromagnetic interference can come from various sources, such as electrical equipment, radio frequency transmissions, and even nearby cables. By using shielding, the cable is better equipped to maintain signal integrity, ensuring that the data being transmitted remains clear and consistent. This is crucial in a variety of fields, including telecommunications, audio/video applications, and industrial settings where reliable operation is necessary.

While shielding can provide some benefits in terms of moisture resistance and mechanical strength, its primary role is in mitigating EMI, thereby enhancing the performance and reliability of the cable in transmitting electrical signals.