) An optical interface for digital audio connections that provides a data rate from 125 Mbps to 1.2 Gbps. Developed by Toshiba and part of the S/PDIF interface, TOSLINK sockets are found on A/V receivers, set-top boxes, CD/DVD players and TVs. See S/PDIF
and audio cable
Digital Audio Connections
Both part of the S/PDIF interface, a TOSLINK socket is commonly found next to its electrical and coaxial counterpart. If TOSLINK is not used, the stopper plug (bottom right) prevents the red LED beam from escaping.
"Optical Audio" is a TOSLINK designation. On this Roku streaming video set-top box, analog audio is provided for legacy TV sets. Neither analog audio nor TOSLINK are supported on Apple TV, Fire TV or Android TV, which have only HDMI output. See set-top box