Optical Digital Audio in

i have a imac a1208 and in the booklet it says that the line in is an optical digital input, but everywhere i look how to use it says that i only have an optical digital output.whats goin on and how do i use it.

"Компьютер Apple iMac A1208 (MA590RS/A)" looks like a late C2D 17"
Audio In / Optical Audio in port
The Audio In port accommodates both digital optical input and analog audio input. Analog audio line input is accepted through a 3.5mm mini phone jack. The sound input jack accepts line-level stereo signals up to 24-bit stereo 44.1-192kHz sampling rate. It also accepts a stereo miniplug-to-RCA cable adapter for connecting stereo equipment to the computer.
Optical audio input is SPDIF format and uses a standard Toslink cable with a Toslink mini-plug adapter, accepting up to 24-bit stereo and 44.1-96kHz sampling rate.
The iMac (Late 2006) also has a built-in microphone near the built-in iSight camera at the top of the computer screen bezel.
Headphone out / Optical audio out port
The headphone / line output jack accommodates both digital optical audio output and analog audio output with a 24-bit, 16-96 kHz D/A converter. For analog headphone / line output a standard audio cable with 3.5mm plastic or nylon optical plug should be used.
17" iMac Intel Core Duo - 1.5GB Ram -   Mac OS X (10.4.9)   - Maxtor 300GB FireWire - Creative Inspire 2.1 - 2G Nano

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