Selecting The Adat Optical Clock Source - Alesis adat AI4 Reference Manual

3
Operation

Selecting the ADAT Optical Clock Source

Clock source selection in the ADAT Optical section is similar to that in
the AES/EBU section. Use the CLOCK SOURCE SELECT button to
toggle between Optical and Word Clock inputs.
As above, the CLOCK SOURCE LEDs show which source is active, and
flash if no valid clock is present. The SAMPLE RATE LEDs light solid
to indicate the nominal sample rate. If the incoming sample rate deviates
from the nominal by more than 2%, the LED indicating the closest
matching nominal sample rate will flash.
If the Optical source is in a 96kHz sample split format—but doesn't
fully comply with the Alesis spec by setting the appropriate user bit—you
can "force" the AI4 to interpret it as 96kHz instead of 48kHz (or
88.2kHz instead of 44.1kHz) by pressing and holding the ADAT
OPTICAL to AES/EBU CLOCK SOURCE SELECT button.
22
If you're using a word clock generator to
provide a stable master clock to all of your
digital gear, you should select WORD
CLOCK as the master clock, both for the
AES/EBU and the ADAT Optical connections.
See page 17 for more.
ADAT Optical Signal Flow and
the AI4
The AI4 can interface with one ADAT Optical
device at a time. You cannot daisy-chain
ADAT Optical-equipped devices connected to
the AI4