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JACK provides clock-synchronization and is not concerned with time-code (this is not entirely true, more on jack-transport later).
Within software, jackd provides sample-accurate synchronization between all JACK applications.
-On the harware side JACK uses the clock of the audio-interface. Synchronization of multiple interfaces requires hardware support to sync the clocks.
+On the hardware side JACK uses the clock of the audio-interface. Synchronization of multiple interfaces requires hardware support to sync the clocks.
If two interfaces run at different clocks the only way to align the signals is via re-sampling (SRC - Sample Rate Conversion) - which decreases fidelity.
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