User`s guide

APOGEE ELECTRONICS
6
X-HD card – User’s Guide
APOGEE ELECTRONICS
7
X-HD card – User’s Guide
Clock Connections
DigiLink Connections
Once the desired order of interfaces has been determined, connect a long DigiLink cable from
the Digidesign PCI to the rst interface and short Digilink cables between all the interfaces as
shown below.
Use only 18” Digilink cables to make connections between hardware interfaces.
After all clock and Digilink connections have been made, ensure that all devices are locked to
a valid clock before starting the computer.
this is the
PRIMARY PORT
this is the
EXPANSION PORT
Incorporating a SYNC I/O
When using a Digidesign SYNC I/O, we recommend that it be made the clock master of the
system; any jitter generated by the SYNC I/O will be sufciently attenuated by the Apogee
interface’s clock circuitry.
To congure the SYNC I/O as clock master, please follow these steps:
1 Connect a word clock cable from the SYNC I/O Word Clock Out to the Master Clock or
rst Apogee interface Word Clock In; connect all remaining interfaces as described on the
previous page.
2 Open a Pro Tools session, choose Setup > Session.
3 Click on the SYNC Setup & Time Code Offsets triangle to reveal the SYNC Setup box.
4 Set Clock Reference to Internal/VSO.
5 The rst Apogee interface should automatically switch to its external word clock source.
Clocking Digidesign and other HD-compatible interfaces
To clock Digidesign or other HD-compatible interfaces, we recommend following the same
guidelines as presented on page 5.
As is generally accepted, using a master clock to synchronize the clock of several digital
devices is always the best practice.
Because the word clock inputs of Digidesign interfaces are internally terminated, it’s not
possible to congure clock with BNC “T” connectors when connected 2 or more Digidesign
interfaces.
Like Digidesign interfaces, the X-HD card is equipped with two ports, Primary and Expansion.
Please note that the Primary Port on the X-HD card is the LEFT connector when looking from the
back of the unit.
(Pro Tools PCI card installed in computer)
(X-HD Cards installed in Apogee converters)
HD Card