Connecting a 2nd Generation Airport Express to a DAC
I keep reading on various platforms, including on here, about using a mini Toslink cable to connect an Airport Express to a DAC. However the Toslink cable only has a single pin on the 3.5 mm jack, and the 3.5 stereo jack on the Airport Express has two channels so, how does the 3.5 stereo jack connect to the Toslink cable please?