Hardware manual
Apollo Hardware Manual Rear Panel
16
(10) 75 Ohm Word Clock Termination Switch
This pushbutton switch provides internal 75-ohm word clock input signal termination when required. Word
clock termination is active when the switch is engaged (depressed).
Apollo’s termination switch should only be engaged when Apollo is set to sync to external word clock and it is
the last device at the receiving end of a word clock cable. For example, if Apollo is the last “slave” unit at the
end of a clock chain (when Apollo’s word clock out port is not used), termination should be active.
Host I/O
Apollo can be connected to the host computer system via FireWire or Thunderbolt. When Apollo is properly
configured and communicating with the host computer, the UAD Link LED (#16 on front panel) is solid green.
Important: Connect only one Apollo FireWire or Thunderbolt port to the host computer.
(11) FireWire 800 Ports
FireWire is used for connecting to the host computer system when the Thunderbolt ports are not in use.
When FireWire is used for the host connection, the second FireWire port can be used for daisy-chaining other
FireWire devices (see the Apollo support web page for important constraints).
Although the two FireWire 800 ports are numbered, they are functionally identical and either port can be used
for FireWire connections.
For additional FireWire information and recommended interconnections, see “FireWire Basics” on page 21.
Note: Apollo cannot be bus powered and it does not supply bus power from its FireWire ports to other devices.
(12) Expansion Bay
The expansion bay is where the Universal Audio Thunderbolt Option Card is installed. Thunderbolt is used
instead of FireWire when connecting to Thunderbolt-enabled host computer systems.
The Thunderbolt Option Card is pre-installed at the factory. For complete details about using Thunderbolt with
Apollo, please visit:
• www.uaudio.com/support/thunderbolt
Note: Earlier Apollo units did not include the Thunderbolt Option Card. However, the earlier units can be easily
retrofitted with the user-installable Thunderbolt Option Card (sold separately).