MOTU Audio Express User's Guide Page 18

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INSTALLING THE AUDIO EXPRESS HARDWARE
18
CONNECT THE AUDIO EXPRESS INTERFACE
Your Audio Express audio interface is equipped
with both a FireWire A (400 Mbit/sec) connector
and a hi-speed USB2 (480 Mbit/sec) connector,
and you can use either port to connect the Audio
Express to your computer. This gives you
maximum flexibility and compatibility with
today’s ever-expanding universe of Mac and
Windows computers.
Which should I use: FireWire or USB2?
If your computer does not have a FireWire port,
then obviously you will need to connect the Audio
Express to one of its high-speed USB 2.0 ports.
If your computer has both FireWire and USB2,
then it is your choice, and your decision may
depend mostly on other peripherals you may also
have, or bus power, as explained below.
Bus-powered operation requires FireWire
There is only one significant difference between
FireWire and USB2 operation: bus power. FireWire
provides enough power on the FireWire bus that
the Audio Express can be powered solely by its
FireWire connection to the computer. For
complete information, see “Bus power
requirements on page 22.
If you use USB2, you must also use the DC power
supply included with your Audio Express, as USB2
does not supply enough power by itself.
If you are connecting via FireWire
1
Before you begin, make sure your computer and
the Audio Express are switched off.
2
Plug one end of the Audio Express FireWire
cable (included) into the FireWire socket on the
computer as shown below in Figure 4-1.
3
Plug the other end of the FireWire cable into the
Audio Express I/O as shown below in Figure 4-1.
Figure 4-1: Connecting the Audio Express to the computer via
FireWire.
Make absolutely sure to align the flat side of
the FireWire plug properly with the flat side of the
FireWire socket on the Audio Express. If you
attempt to force the plug into the socket the wrong
way, you can damage the Audio Express.
High Speed USB 2.0 versus USB 1.1
There are primarily two types of USB host
controllers widely available on current personal
computers. USB 1.1 controllers support simple
peripherals that dont require a high speed
connection, such as a computer keyboard, a
mouse, or a printer. USB 2.0 controllers support
high speed devices such as the Audio Express.
Since the Audio Express requires a high speed
connection, it must be connected to a USB 2.0 host
controller or hub.
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