User`s guide

Chapter 2: Connecting Your Studio 7
ADAT Bridge I/O Front Panel
1. Power Switch
This switch applies power to the Digidesign
ADAT Bridge I/O. The “I” position is on.
The “O” position is off.
2. Sync Mode LEDs
These LEDs indicate which master sample
clock reference is currently being used by
the ADAT Bridge I/O. The ADAT Bridge
I/O’s 16 input/outputs are divided into 2
discrete groups: Group A (channels 1-8)
and Group B (channels 9-16).
About 8- and 16-channel Modes —
Group A and Group B
Each ADAT Bridge I/O is capable of sending
and receiving 16 channels of audio. You
can connect up to two 8-channel ADATs to
each ADAT Bridge I/O. The ADAT Bridge
I/O manages its I/O in two separate 8-chan-
nel groups:
• Group A, which appears in Pro Tools I/O
pop-ups as ADAT Bridge A 1-8.
• Group B, which appears in Pro Tools I/O
pop-ups as ADAT Bridge B 1-8 (think of
these as channels 9-16)
Group A and Group B each have their own
front panel LEDs which indicate that par-
ticular group’s sync mode, channel 1-2 in-
put format, sample rate, and digital format.
Group B will always slave to Group A’s sync
mode and sample rate settings. Channel 1-
2 input is software-selectable.
Group A and Group B also each have their
own pair of rear-panel optical ports for
connection to an ADAT. Optical #1 carries
Group A, channels 1-8. Optical #2 carries
Group B, channels 9-16.
Group A and Group B also have their own
rear-panel data ports for connecting an in-
terface cable to the appropriate Digidesign
card(s) inside your computer.
If you are using a single ADAT, you will
only make connections to Group A. Use
Group B to connect a second ADAT to the
ADAT Bridge I/O or if you wish to use the
Group B digital ports (channels 9-10) for
digital effects sends and returns.
The front panel LEDs provide a convenient
troubleshooting feature. If any of the Sync
Mode or Sample Rate LEDs flash, this indi-
cates a mismatch between the signals being
received by the ADAT Bridge I/O and the
settings currently selected in Pro Tools (in
the Hardware dialog or Session Setup win-
dow). Once you have identified a problem,
Figure 1. ADAT Bridge I/O front panel
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