I have bougth this soundcard for it's ability to 
 - Sync-up with external SPDIF / WCLK (Fs) / MCLK (128*Fs) up to (including) 192kHz
 - Output SPDIF / WCLK (Fs) / MCLK (128*Fs) up to (including) 192kHz

I needed it for my PCM4222EVM ADC to get high-pefformance 192kHz measurement rig. None of souncards i've got had ability to go all the way to 192kHz sampling rate via S/PDIF.

This one of the best products i've ever bought, i loved every bit of it but it's "ISD" cable, which uses classic HDMI port for Infrasonic's needs: MIDI/SPDIF/WCLK I/Os. It is short, you can't bend it and if you bedn it, it may break.

So, i'll make another one myself - with longish coaxial cables and required connectors - thankfully Infrasonic have used standatd HDMI connectors.

As a side note - you can use HDMI cable extender to extend the ISD link, as Infrasonic designed the pinout of their cable with HDMI cables and standard in mind - all the SPDIF/WCLK signals use twisted pairs in the HDMI cable.



So, i have "reverse-engineered" the pinout for your (and mine) convenience:

Pin #	Digital	MIDI	HDMI use
1	S/PDIF OUT		TMDS Data2+
2		MIDI IN Current Source	TMDS Data2 Shield
3	S/PDIF OUT GND		TMDS Data2–
4	S/PDIF IN	MIDI IN Current Sink	TMDS Data1+
5			TMDS Data1 Shield
6	S/PDIF IN GND		TMDS Data1–
7	WCLK IN		TMDS Data0+
8		MIDI OUT Current Sink	TMDS Data0 Shield
9	WCLK IN GND		TMDS Data0–
10	WCLK OUT	MIDI OUT Current Source	TMDS Clock+
11			TMDS Clock Shield
12	WCLK OUT GND		TMDS Clock–
13			CEC
14			Reserved (HDMI 1.0–1.3c), HEC Data-
15			SCL (I²C Serial Clock for DDC)
16			SDA (I²C Serial Data Line for DDC)
17			DDC/CEC/HEC Ground
18			+5 V Power (max 50 mA)
19			Hot Plug Detect (All versions) and HEC Data+
Shield		Shield