I2S is an electrical specification, not a mechanical/physical one. Vendors using it outside their box normally turn it (I2S is single-ended) into an LVDS set of differential signals. The allocation of those signals to physical pins in the HDMI connector is different between vendors.
Help! Is there standardization in i2s?
I have been interested in upgrading my Streamer and DAC. If I purchased a DAC and Streamer from different manufactures will their I2s's (sorry) all mate with each other?
If not, will cable manufactures make i2s patch cords?
If not, will cable manufactures make i2s patch cords?