A digital coaxial audio connection is a wired connection that is used for transferring digital audio signals (such as PCM, Dolby Digital, and DTS) from a source device, such as CD or DVD player and an AV receiver or Surround Sound Preamp/Processor. Digital Coaxial Audio Connections use RCA-style connection plugs.
Digtital Coaxial Audio Connector
From Robert Silva, About.com
Digital Coaxial Audio Cable and Connection
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