Empirical Audio Pace-Car USB, User Manual, Page: 9 / 10

5. Specifications
Inputs
1. USB
2. S/PDIF coax
3. Toslink
4. 12VDC AC adapter
Outputs
1. S/PDIF coax or AES/EBU
2. I2S on RJ-45, Empirical Audio standard (3.3V or optional 5V)
3. Word-Clock output
4. Master Clock output for 44.1
5. Master Clock output for 96
Controls
1. Front Panel input select switch for USB, S/PDIF or Toslink
2. Rear-panel select switch for 44.1/88.2/176.4 or 96/192
Jitter specs (cycle to cycle, standard clock):
S/PDIF coax output - <1nsec total P-P jitter, <34psec P-P jitter below 1MHz
Master Clock outputs - <250psec total P-P jitter, <27psec P-P jitter below 1MHz