User guide

INSTALLING THE ULTRALITE-MK3 HYBRID HARDWARE
27
Figure 4-12: All MOTU FireWire audio interfaces get their clock from a
single master sync source on any connected UltraLite-mk3 (or other
MOTU FireWire interface). After you choose a source from this menu,
the entire system, including all connected UltraLites, synchronizes to
it.
Each FireWire interface in the system gets its clock
from the computer (unless it is the master clock
itself).
Connecting other MOTU FireWire interfaces
You can add an original MOTU 828 to the end of a
FireWire daisy chain (because the 828 has only one
FireWire port), or you can mix and match multiple
UltraLites with other MOTU FireWire interfaces
using a standard FireWire hub. You can also add
828mkIIs, 828mk3s, 896HDs, 896mk3s, Travelers
and UltraLites, which have two FireWire ports
convenient for daisy-chaining. Up to four
interfaces can be combined on one FireWire bus.
Operating multiple FireWire interfaces at high
sample rates
Four MOTU FireWire interfaces can operate at
44.1 or 48kHz on a single FireWire bus, although
you may have to disable optical banks (on
interfaces that have them) to conserve FireWire bus
bandwidth. At the 2x samples rates (88.2 or 96kHz)
and 4x sample rates (176.4 and 192kHz), you can
operate no more than two FireWire interfaces on a
single FireWire bus.
Adding additional interfaces with a second
FireWire bus
Third-party FireWire bus expansion products in
the form of a cardbus (“PC card”) adaptor,
ExpressCard adaptor or PCI card allow you to add
a second FireWire bus to your computer. In may be
possible to add additional MOTU FireWire
interfaces connected to such a third-party product,
depending on the performance of the product and
the performance of your host computer.
Managing the IDs of multiple interfaces
Multiple UltraLite-mk3 interfaces are identified by
number (#1, #2, #3, etc.) Interfaces are ID’d (given
a number) by the order in which they are first
powered up after being connected. This
information is stored in the MOTU Audio
preferences file. Once ID’d, they retain the same
number regardless of the order in which they are
powered up. You can disable an interface at any
time with the Disable interface option shown in
Figure 4-11 on page 26. Doing so frees up the
FireWire bandwidth required by the interface
without turning it off. Switching off an interface
accomplishes the same thing. To get MOTU Audio
Console to forget about an interface entirely, you’ll
see a Forget button in MOTU Audio Console. Just
click the Forget button and MOTU Audio Console
will no longer consider the interface to be present
but off line (turned off).