You can Plug your Digital Audio Coax in and get Toslink Digital Optical Out.
This transforms a digital RCA Coaxial (S/PDIF) audio signal to a Digital Toslink Optical signal.
This coaxial to optical converter will allow you to connect the coaxial digital audio output from your DVD, cable or satellite receiver to a Toslink digital optical input.

This item is for digital signals only. Make sure your devices say digital in or out. This item will not convert analog mono RCA to digital toslink.

Coaxial Digital Input via RCA jack
Optical Digital Output via Toslink

Simple installation - connect your cables to the converter and to your devices.

Dimensions: 2 13/16" x 1 7/8"

Comes with power adapter (wall wart). Input 120V AC 60Hz      Output: 6VDC 3000mA

Note: This item ships with a dust cap over the toslink connector. This dust cap must be removed before use. Just pull it straight out.