Setup guide
Pro Tools|HD Setup Guide28
3 Connect the Port A connector of the FlexCa-
ble to Port A on the second card. Push gently but 
firmly until the cable is fully connected to the 
card. Attach the other end of the FlexCable (la-
beled Port B) to Port B on the core card.
4 Verify the connection. Make sure the FlexCa-
ble ports seat flat against the sockets on the 
cards, and are firmly attached.
5 For systems with more than two cards, con-
nect each additional card to its preceding card. 
Use FlexCables to connect card pairs together, as 
described above, until all cards are connected. 
(Each HD Accel or HD Process card is packaged 
with a FlexCable.)
6 Close the computer case.
Connecting Audio Interfaces
Each Pro Tools|HD audio interface (except the 
96i I/O) supplies up to 16 channels of input and 
output to your system. Audio interfaces are con-
nected directly to Pro Tools|HD cards, or 
through the Expansion ports on other 
Pro Tools|HD interfaces. 
Each Pro Tools|HD card supports up to 32 chan-
nels. To get a full 32 channels of I/O from one 
card, you can connect, or daisy-chain, a second 
16-channel Pro Tools|HD I/O to the first 16-
channel Pro Tools|HD I/O that is connected di-
rectly to the Pro Tools|HD card. 
Pro Tools|HD supports up to a maximum of ten 
192 I/Os, 192 Digital I/Os, or 96 I/Os. Up to five 
96i I/Os can be used simultaneously. 
For examples of connecting multiple I/Os, see 
Figure 7 and Figure 8 on page 29.
Legacy I/Os can also be connected to 
Pro Tools|HD interfaces (see “Connecting Leg-
acy I/Os” on page 30.) 
Top view of two cards connected with TDM FlexCable
Side view of two HD cards connected with TDM 
FlexCable
PORT B
PORT B
PORT A
PORT A
HD Core
HD Accel
PORT B
PORT B
PORT A
PORT A
PORT B
PORT A
PORT A
PORT B
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.










