Specifications

Chapter 1: Introduction to the 192 Digital I/O 1
chapter 1
Introduction to the 192 Digital I/O
The Digidesign 192 Digital I/O is a 16-channel,
all-digital audio interface for use in a
Pro Tools|HD system. The 192 Digital I/O sup-
ports the major digital audio I/O formats
(AES/EBU, S/PDIF, ADAT Lightpipe, and TDIF)
and sampling rates of up to 192 kHz.
192 Digital I/O Features
• 16 discrete channels of digital input and out-
put, with 4-segment LED meters to monitor
input and output levels on each channel
• Real-time sample rate conversion (up to
192 kHz) of up to eight different pairs of input
formats and sample rates
• Input format can be chosen, in two channel
granularity, from the following format types
provided on two factory-installed Digidesign
Digital I/O cards:
• 16 channels of 24-bit AES/EBU I/O at sam-
pling rates of up to 96 kHz in single-wire
mode; or 8 channels at sampling rates of up
to 192 kHz in dual-wire mode
• 16 channels of 24-bit TDIF I/O at sampling
rates of up to 48 kHz
• 16 channels of 24-bit Optical (ADAT) I/O at
sampling rates of up to 48 kHz
• Additional digital I/O options are provided by
three sets of enclosure-mounted ports:
• Two additional channels of 24-bit-capable
S/PDIF I/O, supporting sample rates of up
to 96 kHz
• Two additional channels of 24-bit-capable
AES/EBU I/O, supporting sample rates of
up to 96 kHz
• Eight additional channels of 24-bit-capable
ADAT Optical I/O, at up to 48 kHz sample
rates; can be switched to become two chan-
nels of optical S/PDIF I/O, supporting sam-
ple rates of up to 96 kHz
• Word Clock input and output for synchroniz-
ing 192 Digital I/O with external Word Clock
or 256x (Slave Clock) devices
• Legacy Port for connecting Digidesign MIX-
series audio interfaces
• Simultaneous use of up to eight 192 I/O or
192 Digital I/O units, for a maximum of 128
channels of input, supporting sample rates of
up to 96 kHz.
• 128 channels of input at sample rates of
176.4 kHz or 192 kHz requires Sample Rate
Conversion for TDIF or Optical (ADAT) in-
puts
• AES/EBU I/O at sample rates higher than
96 kHz is limited to 64 channels of input)