MOTU 828x 28x30 Audio Interface with ThunderTechnology - Manual (Page 33)

I N S T A L L I N G T H E 8 2 8 X H A R D W A R E
33
SYNCING WORD CLOCK DEVICES
The 828x word clock connectors allow you to
synchronize it with a wide variety of other word
clock-equipped devices.
For standard word clock sync, you need to choose
an audio clock master (as explained in “Be sure to
choose a digital audio clock master” on page 30).
In the simplest case, you have two devices and one
is the word clock master and the other is the slave
as shown below in Figure 4-17 and Figure 4-18.
Figure 4-17: Slaving another digital audio device to the 828x via
word clock. For the 828x clock source, choose any source besides
word clock, as it is not advisable to chain word clock.
Figure 4-18: Slaving the 828x to word clock. For the 828x clock source,
choose ‘Word Clock In’.
Don’t chain word clock
If you have three or more digital audio devices that
you need to synchronize, avoid chaining their word
clock connections (OUT to IN, OUT to IN, etc.), as
this causes problems. Instead, use a word clock
distribution device of some kind.
Forcing a 1x word out rate
The 828x can generate a word clock output signal
that either matches the current system clock rate
(any rate between 44.1 and 192kHz) or the
corresponding 1x rate. For example, if the 828x is
operating at 192kHz, you can choose to generate a
word out rate of 48kHz. For details on how to make
this word clock output setting, see “Word Out” on
page 42.
Master
Slave
Word clock OUT
Word clock IN
Other device
828x
Audio
clock
Master
Slave
Word clock master device
Word clock OUT
Word clock IN
828x