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X-HD card – User's Guide
Order of Apogee Interface Connection (continued)
When both the AD and the DA are set to Advanced routing and connected to the same PCI
card, the available analog I/O is routed to Pro Tools I/O A1-16 and the available digital I/O
is routed to Pro Tools I/O B1-16, for a total of 32 channels of I/O (as depicted below).
AD-16X & DA-16X
From Computer
P
E
P
E
The Rosetta 800 doesn't include alternate routing modes, so the connection to Pro Tools is
straightforward, as depicted below.
ROSETTA 800
From Computer
P
E
Multiple Digidesign PCI cards
To determine the order of Apogee interfaces when connecting to multiple Digidesign PCI
cards, here are a few guidelines:
1 Create a group of interfaces for PCI card, ensuring that each group is a supported
combination listed in the Interface Connections Chart.
2 Don't exceed the maximum number of interfaces per PCI card – a maximum of 32
inputs and 32 outputs of Apogee interface may be connected per PCI card.
3 There must be at least one interface connected to the HD Core card, but it's not neces-
sary to connect interfaces to Accel or Process cards.
Incorporating Digidesign and other HD-compatible interfaces
When using a Digidesign or other HD-compatible interface on the same PCI card as an
Apogee converter, the Digidesign interface must be connected directly to the PCI card and
the Apogee interface connected to the Expansion port of the Digidesign interface.
Most users will want to configure the Apogee interface as the clock master of the entire
system by connecting it directly to the HD Core card. To acomplish this and still use Digide-
sign interfaces, we recommend connecting the Digidesign interface to an HD Accel or
Process card, if available.
APOGEE ELECTRONICS
A1-16
B1-16
AD-16X: Analog In
DA-16X: Digital In
INPUT
DA-16X: Analog Out
AD-16X: Digital Out
OUTPUT
A1-16
B1-16
INPUT
ROSETTA 800 #1
OUTPUT
4
X-HD card – User's Guide
Clock Connections
In an Apogee-equipped Pro Tools system the first interface serves as the clock master to the entire
system, and may be set to Internal or External clock in Pro Tools Hardware Setup window. All
remaining interfaces must receive a word clock signal synchronous with the first interface's clock
source, whether Internal or External.
When the Pro Tools system is booted, the first interface will switch to the clock source and sample
rate specified in Hardware Setup, while the remaining interfaces will switch automatically to their
external word clock source.
The two most common ways to accomplish the necessary word clock connections are depicted
below.
Using a Master Clock (such as Apogee's Big Ben)
1 Connect a word clock cable between outputs of the
master clock and each interface's word clock input, and
terminate the input with a 75 ohm load.
2 Start your Mac, open Pro Tools, choose Setup >
Hardware and set Clock Source for the first 192 Digital
to External. All remaining interfaces should switch to
their external word clock source automatically.
3 Make sure that the sample rate of the external clock
equals the sample rate of the Pro Tools session
Clocking to the first interface
1 Install BNC "T connectors on the word clock inputs
of the second, third and fourth interfaces (if present).
Connect a word clock cable from the first interface's
word clock output to the BNC "T" connector on the
next interface, from that interface to the next, until all
the word clock inputs have been chained together, as
shown in figure B. Terminate the word clock input of the
last interface with a 75 ohm load.
2 Start your Mac, open Pro Tools, choose Setup >
Hardware and set Clock Source for the first 192 Digital to Internal. The first interface should
switch to the same sample rate as the Pro Tools session automatically. All remaining interfaces
should switch to their external word clock source automatically.
We recommend against looping word clock inputs and outputs to clock multiple units.
APOGEE ELECTRONICS
Big Ben
Interface 1
Interface 2
Interface 3
Interface 4
Figure A. Optimum clocking configuration using BIG BEN
Interface 1
Interface 2
Interface 3
Interface 4
Figure B. Correct clocking configuration to the master device's
clock output using BNC "T" connectors
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