Limit Bandwidth - RME Audio Fireface 400 User Manual

Under WDM the Fireface will (has to) set the
sample rate. Therefore the error shown to the
right can occur. A stable signal with a sample
rate of 32 kHz is detected at the ADAT input
(Sync), but Windows audio had been set to
44100 Hz before. The red color of the text
label signals the error condition, and prompts
the user to set 32000 Hz manually as sample
rate. Under ASIO the audio software sets the
sample rate, so that such an error can not
happen. If the input sample rate is different
then there will be no Sync indication.
With RME's AutoSync and SyncCheck, finally anyone can master this common source of error,
previously one of the most complex issues in the digital studio world.

11.6 Limit Bandwidth

This option helps to reduce the amount of bandwidth used on the FireWire bus. A typical exam-
ple is the use of the Fireface with a laptop. Only in rare cases the ADAT port is needed, in many
cases it stays unused. The option Analog+SPDIF will reduce the amount of constantly (!) trans-
ferred data from around 3 MByte (6 in both directions) to only 1.7 MByte (3.4 in both directions).
The FireWire connection will be more stable, reliable and robust, leaving additional bandwidth
for other devices. At the same time the CPU and system load is reduced, as less channels have
to be processed and to be transferred. In TotalMix, the deactivated software playback channels
will be replaced with empty plates. More details are found in chapter 35.4.
Available Settings
All channels (default) activates all 18 input and output channels
Analog + SP. + ADAT 1-4 activates all 8 analog channels plus SPDIF plus 4 ADAT channels
Analog + SPDIF activates all 8 analog channels plus SPDIF
Analog 1-8 activates only the first eight analog channels
User's Guide Fireface 400 © RME
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