Tascam IF-TAD Owner's Manual page 17

IF-TAD Interface
through the optical interface. No dedicated word clock connec-
tions are required in this setup.
However, as described earlier, the ADAT LX20 may sometimes
experience problems at first with the word clock synchronization,
but using the PITCH UP and PITCH DOWN keys to change the
pitch away from standard, and then re-set to standard pitch will
usually re-lock the word synchronization (as described in 2.2,
"Problems which may occur").
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TASCAM IF-TAD –