Specifications

HD I/O Guide14
To connect multiple HD I/Os to a Pro Tools|HD
system:
1 Connect the Primary Port of the first HD I/O
to the DigiLink Port on the Pro Tools|HD Core
card with a DigiLink Mini to DigiLink cable (in-
cluded with your Pro Tools|HD system).
2 Do one of the following:
• Connect the Primary Port of the second HD
I/O to the Expansion Port on the first HD
I/O with the included 18-inch DigiLink
Mini cable.
– or –
• Connect the Primary Port of the second HD
I/O to the next available Pro Tools|HD card
with a DigiLink Mini to DigiLink cable (in-
cluded with your Pro Tools|HD system).
3 Connect additional HD I/Os to additional
Pro Tools|HD cards.
4 Make the necessary Loop Sync connections.
Connecting Loop Sync
If you are using two (or more) Pro Tools audio
interfaces or a SYNC peripheral, Loop Sync must
be connected to maintain proper clock among
the devices. For an example of connecting mul-
tiple Pro Tools|HD audio interfaces, see Figure 2
below.
To make Loop Sync connections:
1 Connect (daisy-chain) the Loop Sync Out of
each interface to the Loop Sync In of the next
interface with the BNC cables included with
your audio interface.
2 Connect the Loop Sync Out of the last inter-
face to the Loop Sync In of the primary interface
or SYNC peripheral.