3FT TOSLINK-TOSLINK DIGITAL 5mm Audio Cable
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TOSLINK or Optical Cable is a standardized optical fiber connection system. Its most common use is in consumer audio equipment (via a "digital optical" socket), where it carries a digital audio stream between components such as MiniDisc and CD players and DAT recorders. Although TOSLINK supports several different media formats and physical standards, digital audio connections using the rectangular EIAJ/JEITA RC-5720 (also CP-1201 and JIS C5974-1993 F05) connector are by far the most common.
Toslink Info at Wikipedia