Audio cables come in all types, sizes and configurations, the most popular cable used for audio is a Toslink cable, or it’s often referred to as a optical cable. It’s a standardized optical fiber connection system for connecting things such as CD players and DAT recorders. The standard for digital audio and video is PCM, pulse code modulation. Toshiba invented the Toslink in 1983 for use with their CD players connecting them to the receiver for the PCM audio signal. This cable became a standard for other manufacturers, the standard name is EIAJ optical.