What is the function of optical plugs?

The function of optical plugs is to facilitate digital audio connections. Optical plugs, often associated with optical audio cables, utilize fiber optic technology to transmit audio signals in a digital format. This allows for high-quality sound transfer free from electro-magnetic interference, which can be an issue with analog connections.

This method of transmission is particularly beneficial for connecting devices such as DVD players, game consoles, and sound systems, as it supports formats such as Dolby Digital and DTS. Using optical connections ensures that the audio signal remains in a digital format until it reaches the receiving device, enhancing overall sound fidelity and clarity without degradation common in analog signal paths.

Other options like connecting analog devices or transmitting analog audio signals relate to older or different technologies that do not take advantage of the benefits provided by optical connections. Additionally, measuring video signal levels does not pertain to the function of optical plugs, which are specifically designed for audio rather than video signals.