We have collected the most relevant information on Combined Optical Digital Input/Audio Line In Minijack. Open the URLs, which are collected below, and you will find all the info you are interested in.
"Combined optical digital audio input/aud… - Apple Community
https://discussions.apple.com/thread/1060536
Just because a mini-jack is digital does not mean it can support multi-channel sound beyond 2.0. I don't even think it supports 2.1 sound. a DVD (played with Apple's DVD Player or VLC) should be able to send 5.1 AC-3 digital optical audio through the optical min-jack. You're absolutely right Malcolm.
Mac mini (Early 2009) - Technical Specifications
https://support.apple.com/kb/SP505?locale=en_US
Built-in speaker, combined optical digital audio input/audio line in, combined optical digital audio output/headphone out. Built-in AirPort Extreme Wi-Fi (802.11n) 3; built-in Bluetooth 2.1 + EDR (Enhanced Data Rate) Your Mac mini comes with 90 days of free telephone support and a one-year limited warranty.
Mac Mini microphone and audio issues - Apple Community
https://discussions.apple.com/thread/2797163
For most of them, under the "Audio" subheading, you will see a line that says, "Combined optical digital audio input/audio line in (minijack)." "Audio line in" refers to the "line level" analog audio standard, perhaps the most widely supported audio standard in existence. The jacks on almost all analog audio devices operate at line level.
Apple Unveils All New Mac mini - Apple
https://www.apple.com/newsroom/2010/06/15Apple-Unveils-All-New-Mac-mini/
combined optical digital audio output/headphone out (minijack). Build-to-order options and accessories include up to 8GB 1066 MHz DDR3 SDRAM, 500GB hard drive running at 5400 rpm, Apple Remote, Aperture™ 3, Final Cut® Express 4, Logic® Express, iWork® (pre-installed), Apple Wireless Keyboard, Magic Mouse, Apple 24 inch LED Cinema Display and the …
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