What makes a Digital Interconnect

Actually, despite having at least 3 ICs specifically designed for digital , I use a standard IC for carrying the data between transport and DAC. I find it does a better job in MY SYSTEM. I see some of the Digital cables are specified at 110 Ohms instead of 75 and some makers say the 1.5 M is the proper length. Al , I will leave the technical details up to you, my attitude toward them is the same as Charles Lamb's toward matters concerning Space and Time: "Nothing puzzles me more than such questions and yet nothing bothers me less as I never think about them". Seriously, I have tried a variety of dedicated digital ICs as well as standard ones and never found 2 who were indistinguishable. Possibly if I had tried freebies or really cheap ones this would have happened. Unless you want to do some serious research don't worry too much about the specs., just hook it up and see what it sounds like.