I2S specifies the signals on the leads, not the physical construction of the connections. The standard was established by Audio Alchemy with the round 5-pin miniDIN but others have taken different paths.
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Good info from Kr4 and Perose. I'd like to add that the Revelation I2S cable is a very fine product and is better than much of the competition out there (from my experience). I'd try to stick with that cable if at all possible. If you need to know someone who sells these cables, drop me a note -- I bought mine over a year ago and can't remember the gentleman's name right now, but I can look it up. Good luck.