Specifications

Chapter 2: 192 Digital I/O Overview 5
192 Digital I/O Rear Panel
The 192 Digital I/O has the following rear panel
features:
Inputs and outputs are provided by the two Dig-
ital I/O Cards, and the built-in Enclosure ports.
The two empty bays (located in the middle of
the rear panel) are not expandable.
Digital I/O Cards
The 192 Digital I/O features two Digital I/O
cards with identical sets of input and output
ports. Each card handles eight of the 16 total
available channels of I/O. The top card (Bay 1)
handles I/O channels 1–8. The bottom card
(Bay 2) handles channels 9–16.
The inputs on the Digital I/O card feature real-
time sample rate conversion. For example, you
can stream audio with a sample rate of 44.1 kHz
into a 96 kHz session. See “Digital Format Set-
tings and Sample Rate Conversion” on page 14.
Input is provided through DB-25 connectors for
AES/EBU and TDIF inputs, along with a pair of
ADAT optical ports. See Appendix B, “Pinout Di-
agrams for the DB-25 Connectors.”
The TDIF and ADAT outputs will output up to
48 kHz. The AES/EBU output can output sup-
ported sample rates from 44.1 kHz to 192 kHz.
About Real-Time Sample Rate Conversion
Each set of inputs on the Digital I/O cards can
stream in at any sample rate and be converted to
the current Pro Tools session sample rate via
hardware-based real-time sample-rate conver-
sion chips.
Sample rate conversion is selectable on a chan-
nel pair basis. When disabled, digital informa-
tion completely bypasses the sample-rate con-
version chips.
Digital Formats
AES/EBU Each card contains DB-25 connectors
for eight channels of AES/EBU I/O. Each of the
four paired channels of AES/EBU on each card is
a balanced three-conductor signal that supports
single wire I/O up to 96 kHz and dual wire I/O
up to 192 kHz.
192 I/O rear panel
Bay 2: Digital I/O Card (Channels 9–16)
Bay 1: Digital I/O Card (Channels 1–8)
Enclosure Ports