User Manual

User's Guide Fireface UC © RME
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12.4 Channel Count under WDM
The Fireface’s ADAT optical interface offers sample rates of up to 192 kHz using a standard
ADAT recorder. For this to work single-channel data is spread to two or four ADAT channels
using the Sample Multiplexing technique. This reduces the number of available ADAT channels
from 8 to 4 or 2 per ADAT port.
It is nearly impossible to change the number of WDM devices without a reboot of the computer.
Therefore whenever the Fireface UC changes into Double Speed (88.2/96 kHz) or Quad Speed
mode (176.4/192 kHz) all devices stay present, but become partly inactive.
WDM Stereo devices Double Speed Quad Speed
Fireface UC Analog (1+2) Fireface UC Analog (1+2) Fireface UC Analog (1+2)
Fireface UC Analog (3+4) Fireface UC Analog (3+4) Fireface UC Analog (3+4)
Fireface UC Analog (5+6) Fireface UC Analog (5+6) Fireface UC Analog (5+6)
Fireface UC Analog (7+8) Fireface UC Analog (7+8) Fireface UC Analog (7+8)
Fireface UC SPDIF Fireface UC SPDIF Fireface UC SPDIF
Fireface UC AS (1+2) Fireface UC AS (1+2) Fireface UC AS (1+2)
Fireface UC ADAT (3+4) Fireface UC ADAT (3+4) Fireface UC ADAT (3+4)
Fireface UC ADAT (5+6) Fireface UC ADAT (5+6) Fireface UC ADAT (5+6)
Fireface UC ADAT (7+8) Fireface UC ADAT (7+8) Fireface UC ADAT (7+8)
12.5 Multi-client Operation
RME audio interfaces support multi-client operation. This means several programs can be used
at the same time. Also ASIO and WDM can be used simultaneously. The use of multi-client
operation requires to follow two simple rules:
Multi-client operation requires identical sample rates!
I.e. it is not possible to use one software with 44.1 kHz and the other with 48 kHz.
Different software can not use the same playback channels at the same time.
If for example Cubase uses channels 1/2, this playback pair can't be used in WaveLab, no mat-
ter if ASIO or WDM. However, this is no limitation at all, because TotalMix allows for any output
routing, and therefore a playback of multiple software on the same hardware outputs. Note that
identical inputs can be used at the same time, as the driver simply sends the data to all applica-
tions simultaneously.
ASIO-Multiclient
RME audio interfaces support ASIO multi-client operation. It is possible to use more than one
ASIO software at the same time. Again the sample rate has to be identical, and each software
has to use its own playback channels. Again the inputs can be used simultaneously.
RME's sophisticated tool DIGICheck is an exception to this rule. It operates like an ASIO host,
using a special technique to access playback channels already occupied. Therefore DIGICheck
is able to analyse and display playback data from any software, no matter which format the
software uses.