With all due respect, Schwinnindia and some others are absolutely mistaken. As far as the Playback Designs and maybe a few other players and, or DACs, AES/EBU and SPDIF are truly capable of going up to up to 192kHz with a single cable. TOSLINK is limited to 96kHz.
There are some sound cards that support hi-rez output through single AES/EBU or SP/DIF cables. The Lynx AES 16 is one of them. The Playback Designs will receive these hi-res files and recognize the true bandwidth at up to 24 bits. As a matter of fact, it will even convert these files to twice the sample rate of DSD.
We just exhibited at CES / T.H.E. Show playing TRUE 24/192 through a single AES/EBU cable.
