DigiDesign 003 Family Setup Manual page 72

These outputs are enabled when the Alt CR
switch is enabled (lit).
Aux In
These are balanced, 1/4-inch TRS connectors for
connecting alternate audio sources such as CD
players or tape decks. The signal from these in-
puts can be routed directly to the Main Monitor
Outputs (for monitoring) or to Inputs 7–8 (for
direct input into Pro Tools) from the top panel
of 003, or the front panel of 003 Rack.
Operating levels for these inputs are fixed at
+4 dBu.
When the Aux In switch is enabled (lit), Aux In
signal is routed to the Main Monitor Outputs.
Audio in Pro Tools that is routed to Analog 1–2
will not be mirrored at the Monitor Outputs.
When the Aux In to 7/8 switch is enabled (lit),
Aux In signal is routed to Inputs 7–8 and does
not pass directly to the Monitor Outputs.
When the Alt CR switch is enabled (lit), audio
routed to Aux In will pass out the Alt Monitor
Outputs.
Digital I/O
S/PDIF Digital I/O
The S/PDIF in and out ports are unbalanced
two-conductor phono (RCA) connectors that
utilize a full 24-bit, two-channel digital data
stream.
The Sony/Philips Digital Interface Format
(S/PDIF) is used in many professional and con-
sumer CD recorders and DAT recorders. For
highest digital signal integrity, and lower jitter,
use 75 Ohm coaxial cable for S/PDIF transfers
and keep the cable length to a maximum of 10
meters.
62 003 Family Setup Guide
003 and 003 Rack support consumer mode S/PDIF
output format (IEC60958-3) at sample rates of
44.1 kHz and 48 kHz, and professional mode
S/PDIF output format (IEC60958-4) at sample
rates of 88.2 kHz and 96 kHz. For information
on which S/PDIF formats are supported by your
S/PDIF-compatible gear, see the manufacturer's
documentation.
Optical I/O
These are a pair of TOSLINK-style connectors for
ADAT Optical (8 channels of I/O) or S/PDIF Op-
tical (2 channels of I/O) devices. You can choose
between these Optical I/O formats in the
Pro Tools Hardware Setup dialog.
The Optical port can be set for eight channels of
ADAT Optical I/O (supporting up to 48 kHz) or
two channels of S/PDIF Optical I/O.
The Optical I/O ports support 24-bit, 20-bit and
16-bit resolutions in both modes.
Only one S/PDIF input pair can be used at a
time. For example, if you use the Optical In
for S/PDIF data, you cannot use the RCA in-
puts.
At 96 kHz, it is recommended that you use
the S/PDIF (RCA) port
The Optical I/O ports use a standard optical
"lightpipe" cable.
Digidesign recommends high-quality audio
grade optical cable for all optical connec-
tions.
When the 003 or 003 Rack is on, its Optical Out
port emits a red light.