RME Audio DMC-842, User Manual

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User’s Guide DMC-842
© RME
14.2 ADAT Optical
The DMC-842 provides two digital outputs in ADAT optical format. In normal operation these
ports carry the converted analog input signal. When using the I64 MADI Card and activating the
option
oP in the Setup menu do , the MADI input data is present at the output instead, see chap-
ter 11.11. In Single Speed mode both outputs carry the same audio data. With this it is possible
to distribute the output signal to two devices (2 x ADAT splitter).
As the ADAT optical signal is physically specified up to 48 kHz only, the DMC-842 automatically
activates Sample Split mode (S/MUX) at 88.2 and 96 kHz, distributing the data of one channel
to two output channels. The internal frequency stays at 44.1/48 kHz. Therefore the sample
clock at the ADAT outputs is only half the frequency of the AES outputs. As interesting as this is
– you don't need to think about it. 96 kHz capable ADAT hardware, like all current RME digital
interfaces, re-combine the data automatically. The user (and the DAW software) does not see
any split data, but just single channels at the expected double sample rate.
The ADAT outputs can be used in parallel to the AES outputs at up to 192 kHz, but in QS mode
only channels 1 to 4 will be available.
The ADAT optical outputs of the DMC-842 are fully compatible to all ADAT optical inputs. A
usual TOSLINK cable is sufficient for connection.
ADAT Main
Interface for the first or only device receiving an ADAT signal from the DMC-842. Carries the
channels 1 to 8. When sending a Double Speed signal, this port carries the channels 1 to 4. In
Quad Speed mode this port carries channels 1 and 2.
ADAT AUX
In Single Speed mode carries a copy of the data at the Main output. When sending a Double
Speed signal, this port carries the channels 5 to 8. In Quad Speed mode this port carries the
channels 3 and 4.