Setup guide

003 Family Setup Guide72
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.
The 003 Rack+ supports 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.
The Optical I/O ports use a standard optical
“lightpipe” cable.
When the 003 Rack+ is on, its Optical Out port
emits a red light.
About Lightpipe-Compatible Devices
Lightpipe is an industry standard, eight-channel
optical digital audio connection developed by
Alesis. Lightpipe is found on many devices, in-
cluding ADAT decks, modular digital
multitracks (MDMs), sound cards, standalone
A/D or D/A converters, and digital consoles.
Word Clock
The Word Clock In and Out ports let you con-
nect BNC cables to synchronize your 003 Rack+
to incoming 1x Word clock, and synchronize
other devices to Pro Tools-generated Word
clock.
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
Digidesign recommends high-quality audio
grade optical cable for all optical connec-
tions.