Specifications

Pro Tools|HD Getting Started Guide14
For examples of connecting multiple I/Os, see
Figure 1 and Figure 2 on page 15.
Legacy I/Os can also be connected to
Pro Tools|HD interfaces. See “Connecting an
Additional 16 Channels of Audio with Legacy
I/Os” on page 16.
To connect Pro Tools|HD audio interfaces:
1 If you are using a single 192 I/O,
192 Digital I/O, 96 I/O, or 96i I/O, connect its
Primary Port to the Accel Core (for PCIe) or HD
Core (for PCI) card with the DigiLink cable pro-
vided with the card. You must attach at least one
192 I/O, 192 Digital I/O, 96 I/O, or 96i I/O to
your system in order for Pro Tools to launch.
2 Connect additional Pro Tools|HD audio inter-
faces to subsequent Digidesign audio cards, or
daisy-chain the interfaces (by connecting the
Primary Port of the secondary interface to the
Expansion Port of the primary interface).
If you are connecting both 192 I/O (or
192 Digital I/O) and 96 I/O audio interfaces to
your system, connect the 192 I/O (or
192 Digital I/O) to your Accel Core (for PCIe) or
HD Core (for PCI) card, followed by any addi-
tional 192 I/O (or 192 Digital I/O) interfaces
connected to subsequent cards. Then connect
96 I/O interfaces to subsequent cards, or to
other interfaces, then connect 96i I/O inter-
faces.
You can also connect a single Pro Tools|HD in-
terface to each Pro Tools|HD card in your system
using the provided DigiLink cables. (However,
there is no advantage to this configuration over
daisy-chaining interfaces.)
Connecting Loop Sync
If you are using two or more Pro Tools|HD audio
interfaces or a SYNC I/O peripheral, Loop Sync
must be connected to maintain proper clock
among the devices.
To make Loop Sync connections:
1 Connect the Loop Sync Out of each interface
to the Loop Sync In of the next interface with
the BNC cables included in your I/O packaging.
2 Connect the Loop Sync Out of the last inter-
face to the Loop Sync In of the primary interface
or SYNC I/O peripheral.
Connecting Legacy I/Os
If you are connecting a Digidesign Legacy I/O,
continue with “Connecting an Additional 16
Channels of Audio with Legacy I/Os” on
page 16.
Pro Tools|HD audio interfaces need room at
their sides to maintain proper air flow for
cooling. Do not block the sides of the unit or
disconnect the internal fan. If the units are
rack-mounted in a case, remove the case
lids or doors before operating the system.
Failure to do so can result in the units over-
heating very quickly, which can perma-
nently damage sensitive components.
If you have at least one 192 I/O or
192 Digital I/O in your system configura-
tion, it must be connected to the Accel Core
(for PCIe) or HD Core (for PCI) card as the
primary interface.
The 96i I/O does not support Legacy I/O.