The GC-CGX cable can be used with the GC-100, iTach IP2IR and WF2IR, and with the Flex IP and Flex WF units to connect higher voltage (12v) connecting blocks and systems to the GC devices.
The quickstart guide can be found here:
The wiring color code has changed from the quickstart guide above. The current scheme is below:
White: Tip = IR
Red: Ring = GND
Braid: Base = PWR