User`s guide
User's Guide Fireface UC © RME
13
Output Format 
Word 
The word clock output signal usually equals the current sample rate. Selecting Single Speed 
causes the output signal to always stay within the range of 32 kHz to 48 kHz. So at 96 kHz and 
192 kHz sample rate, the output word clock is 48 kHz. 
Optical 
The optical TOSLINK output can operate as ADAT or SPDIF output. The Channel Status is 
fixed to Consumer state. 
Note
: The optical input detects the incoming format automatically. 
SPDIF coax. 
The coaxial SPDIF output can have the Channel Status Consumer or Professional. For further 
details please refer to chapter 24.2. 
Options 
SPDIF In - TMS 
TMS activates the transmission of Channel Status data and Track Marker information from the 
SPDIF input signal. 
Clock Mode 
Sample Rate 
Sets the currently used sample rate. Offers a central and comfortable way of configuring the 
sample rate of all WDM devices to the same value, as since Vista this is no longer supported to 
be done by the audio program. However, an ASIO program can still set the sample rate by it-
self. 
At ongoing record/playback the selection is greyed out, so no change is possible. 
Clock Source 
The unit can be configured to use its own clock (Internal = Master), or one of the input signals 
(Word, Optical, SPDIF coax., LTC = Slave). If the selected source isn't available, the unit will 
change to the next available one (AutoSync). If none is available then the internal clock is used. 
The current clock source is displayed to the right. 
Pitch 
More information on Pitch is available in chapter 8.2. 
Input Status 
Indicates for each input (Word, optical, SPDIF coax.) whether there is a valid signal (Lock, No 
Lock), or if there is a valid and synchronous signal (Sync). The second row shows the sample 
frequency measured by the hardware. In Clock Mode the clock reference is shown. See also 
chapter 31.1. 
The tab About includes information about the current driver and firmware version of the Fire-
face UC plus two more options: 
Lock Registry 
Default: off. Checking this option brings up a dialog to enter a password. Changes in the Set-
tings dialog are no longer written to the registry. As the settings are always loaded from the 
registry when starting the computer, this method provides an easy way to define an initial state 
of the Fireface UC. 










