5. REAR PANEL
SM Pro Audio A08 rear panel
The SM Pro Audio A08 rear panel houses the AC power input, Word clock I/O connections, the
ADAT optical output, and the sync & sample rate selector switches.
5.1 ADAT optical output
On the rear of the SM Pro Audio A08 there is 1 x ADAT® optical light-pipe output connector. It is
covered with a small black plastic protector plug. Please remove the plastic connector plug
before connecting your optical cable. Simply connect a standard optical cable from this output to
your destination devices ADAT® input.
5.2 Word clock I/O
Word clock input and output
Two BNC connectors are provided on the rear panel for input and output of word clock signal.
Word clock sync allows multiple digital devices to keep the audio in sync. Each device's internal
clock operates at a sample frequency slightly different from its neighbor, even if all devices are
set to the same nominal rate. As a result, audible pops and clicks may result when un-synchro-
nized digital sources are mixed. We recommend using 75 Ohm coaxial cable for your connec-
tions.
5.3 Sync selector switch
The sync selector switch determines which word clock generator the A08 receives its sync from.
If it is set to INT (internal/master), the A08 generates its own clock internally. It will also pass it’s
generated clock out the W/C output connector for connection to other devices. When set in the
EXT (external/slave) position the A08 is set to operate using another devices generated word
clock signal. The word clock signal is also passed through the W/C output for daisy chaining
other devices. Daisy chaining word clock signal will also have it’s own sync problems when using
many devices or long cables. Termination at the end of your word clock chain is also necessary
using a 75 Ohm resister. It is recommended if you have many devices that you use a dedicated
master clock generator that individually supplies word clock to each device.
5.4 Sample rate selector switch
The SM Pro Audio A08 can operate at either 44.1kHz or 48kHz sample rate. This is the sample
rates allowed by the ADAT® format. Please select the desired sample rate for your current proj-
ect. Your selection should match the sample rates of all other digital equipment.
8
Rear Panel
