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User’s Guide DMC-842
© RME
13. Digital Inputs
13.1 XLR
At the rear side of the DMC-842 there are eight XLR sockets for the AES42 inputs. All inputs
are transformer-balanced, ground-free and compatible to AES3. Channel status and copy pro-
tection are being ignored.
Thanks to a highly sensitive input stage, SPDIF
signals can also be processed by using a simple
cable adapter phono/XLR. To achieve this, pins
2 and 3 of a male XLR plug are connected indi-
vidually to the two pins of a phono plug. The
cable shielding is only connected to pin 1 of the
XLR - not to the phono plug.
The inputs can be used in any combination, e. g. it is sufficient to connect an input signal only to
input 3.
Note: Please note that when using AES input signals the DMC-842 is not able to synchronize
on these. It is necessary to either use another Sync reference (D-sub AES1 or word clock), or to
activate the sample rate conversion.
The DMC-842 supports single wire only, in the range of 32 kHz up to 192 kHz: a total of 8
channels, 2 channels per AES wire. The effective sample frequency equals the clock on the
AES wire. In case a conversion from/to Single, Double and Quad Wire is required, the ADI-192
DD, an 8-channel universal sample rate and format converter, is highly recommended.
Emphasis
AES/EBU and SPDIF can contain an Emphasis information. Audio signals with Emphasis have
a strong high frequency boost and thus require a high frequency attenuation on playback.
An Emphasis indication gets lost! This information is neither passed on to the MADI output,
nor to any of the AES outputs, and has also no effect on the analog outputs!
The pin assignment follows international standards. With XLR, pin 2 is + or hot, pin 3 is – or
cold, pin 1 is ground. Pin 1 is connected to the chassis directly at the socket (AES48).
13.2 D-Sub - AES/EBU Sync
The input AES 1 (channel 1/2) found on the D-sub connector can not be used for audio with the
DMC-842, but as clock source and for remote control. The input is transformer-balanced and
ground-free. Thanks to a highly sensitive input stage, a SPDIF signal can also be fed by using a
simple cable adapter phono/XLR. (see above).
Pinout of the D-sub connector, Inputs
Signal In
1/2+
In
1/2-
In
3/4+
In
3/4-
In
5/6+
In
5/6-
In
7/8+
In
7/8-
D-sub 24 12
10 23 21 9 7 20
GND is connected to pins 2, 5, 8, 11, 16, 19, 22, 25. Pin 13 is not connected.
Summary of Contents for DMC-842
Page 5: ...User s Guide DMC 842 RME 5 User s Guide DMC 842 General...
Page 12: ...12 User s Guide DMC 842 RME...
Page 13: ...User s Guide DMC 842 RME 13 User s Guide DMC 842 Usage and Operation...
Page 29: ...User s Guide DMC 842 RME 29 User s Guide DMC 842 Inputs and Outputs...
Page 39: ...User s Guide DMC 842 RME 39 User s Guide DMC 842 Technical Reference...
