Optical Audio
Digital data is transmitted to and from the optical audio I/O using special optical cables. The 7.5 mm digital optical connectors on the cables, commonly referred to as TOSLink, are for both input and output and conform to the IEC60874-17 connector standard.
The TOSLink friction-lock type F-05 connectors are available from pro-audio, musician's supply, hifi, and other retailers.
Analog audio signals are converted to digital data internally. All audio is handled digitally inside the computer, including audio data from the CD or DVD drive and from devices connected to the USB and FireWire ports. Audio data is converted to analog form for output to the internal speaker, the headphones, or the analog output port.
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