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Toslink is a type of digital audio connection developed by Toshiba Corporation. It uses a fiber optic cable to transmit an audio signal in the form of pulses of light. A single Toslink cable can be used to carry a mono, stereo, or even a surround audio signal.
Toslink is similar to the Sony/Philips Digital Interfance, known as S/PDIF. It provides the same digital audio data as S/PDIF, but uses a light beam instead of an electrical current to send the data. Because the Toslink cable does not use electrical currents, the connection is immune to electrical or magnetic interference. Toslink connections are most commonly found on high-end home theater receivers, MiniDisc players, and professional audio equipment, as well as Power Mac G5 computers.