Specifications

Pro Tools|HD Getting Started Guide16
Connecting an Additional 16 Channels
of Audio with Legacy I/Os
Each 192 I/O, 192 Digital I/O, and 96 I/O can
support 16 channels of audio to and from Digi-
design Legacy I/Os. (The 96i I/O does not sup-
port Legacy I/O.) Legacy I/Os include the
888|24 I/O™, 882|20 I/O™, 1622 I/O™, and the
24-bit ADAT Bridge I/O™.
To connect Digidesign Legacy I/Os:
1 Connect the “MIX card” end of the peripheral
cable that came with your Legacy I/O (60-pin
side) to the Legacy Port on the primary
Pro Tools|HD audio interface. Connect the
other end to the Computer Port on the Legacy
I/O.
2 Do one of the following:
• Connect any additional Legacy I/Os in the
same manner, to Pro Tools|HD audio inter-
faces connected directly to HD cards.
– or –
• If you are using a Y cable (Legacy 16-chan-
nel peripheral cable adapter), connect this
to the Legacy port first, then connect the
audio interface peripheral cables to Port A
and Port B of the Y cable.
3 To properly clock the Legacy I/O, connect the
Ext. Clock output port on the Pro Tools|HD I/O
to the Slave Clock IN on the Legacy I/O. The
Legacy I/O will switch to Slave mode once the
proper clock is outputting from the
Pro Tools|HD I/O. Always use the Ext. Clock Out
port of the same I/O to which the Legacy I/O is
attached.
If you are using the Y cable to connect multiple
MIX audio interfaces, you must also connect the
Slave Clock Out of the first Legacy interface to
the Slave Clock In of the second Legacy inter-
face with the provided BNC cable. You cannot
clock more than two MIX audio interfaces from
a single Pro Tools|HD audio interface. If you
have a third MIX audio interface, supply its
256x clock from the Pro Tools|HD I/O to which
its 60-pin cable is attached (either your second
audio interface, or directly to an HD Accel or
HD Process card).
The original 888 I/O and 882 I/O interfaces
are not supported with Pro Tools|HD.
Optional 16-channel peripheral cable adapter
“A” to first
Legacy I/O
“B” to second
Legacy I/O
To Legacy Port on
Pro Tools|HD audio interface
To ensure the proper functioning of Legacy
I/Os (such as an 888|24 I/O or
882|20 I/O), launch Pro Tools and initial-
ize the Legacy I/Os in the Hardware Setup
dialog before turning them on (See “Config-
uring Legacy I/Os” on page 50). Then quit
Pro Tools and shut down your computer.
When relaunching your Pro Tools system,
turn on your Legacy I/Os first and allow
them to finish booting before turning on
your Pro Tools|HD audio interfaces, and
then your computer.
Before you turn on and configure your Leg-
acy I/Os, turn down the volume of output
devices. Very loud digital noise may be
emitted before the Legacy I/O is initialized.