Sar, I'm not sure I understand your question. You want to find a cable that has an ethernet jack on one end and an RCA on the other? That's won't happen, because it's vastly different signals that are transmitted by each of those types of connections. (Ethernet works by sending data through 4 pairs of wires.) That's where the Squeezebox comes in to play. It acts as the interface between your music server (your computer) and the stereo (by offering analog and digital outputs that your preamp or DAC can understand).
There are also USB DAC's, which is also an option, but not if you're going to be 80 feet from the computer. Ethernet, on the other hand, has a range of 100 meters.
Michael
There are also USB DAC's, which is also an option, but not if you're going to be 80 feet from the computer. Ethernet, on the other hand, has a range of 100 meters.
Michael