The minijack 3.5mm is a popular connector used primarily for headphones although its functionality is much more varied.

It consists of a maximum of three connecting parts being the largest so-called mass or negative polarity and two of smaller size and located farther end of the connector, called living or positive that correspond to each channel, such three-part plug can transmit signals in two different channels, also known as stereo signals. It also exists in a mono minijack but version composed of only two parts, a body and a living or positive.

TOSLINK (Toshiba Link) is a standard fiber optic connection created by Toshiba 1983, which is based on the use of optical signals instead of electrical signals. It is generally used for interconnecting audio equipment, but supports different formats, both physical and data. 1 (in the image) Toslink Connector 2 (pictured) Connector Mini Toslink