SPDIF: The UCX provides a coaxial SPDIF I/O working at up to 192 kHz.

ADAT: One 8-channel ADAT I/O expands the UCX by 8 channels available simultaneously with the analog channels. They can be used to connect an 8-channel AD/DA converter, a mixing console, or to insert an effect device. The ADAT I/O supports sample rates with up to 192 kHz (S/MUX4). Using an external converter like the ADI-8 QS, the UCX will provide 16 analog inputs and outputs, 12 with a sample rate of 96 kHz, and still 10 at 192 kHz.

SPDIF: The ADAT I/O can be used as optical SPDIF I/O, making the UCX connections even more flexible.

Word Clock & MIDI: A word clock input and output (BNC) with switchable termination plus two MIDI I/Os on a breakout cable complete the I/O list and turn the Fireface UCX into a professional audio system with universal usability.