Digital Connections; Adat; Spdif - RME Audio Hammerfall HDSP 9632 User Manual

25. Digital Connections

25.1 ADAT

The ADAT optical I/O of the HDSP 9632 is fully compatible to all ADAT equipped units. RME's
unsurpassed Bitclock PLL prevents clicks and drop outs even in extreme varipitch operation,
and guarantees a fast and low jitter lock to the digital input signal. A usual TOSLINK cable is
sufficient for connection. More information on Double Speed (S/MUX) can be found in chapter
33.3.
ADAT In
Interface for a device sending an ADAT signal to the HDSP 9632. Carries the channels 1 to 8.
When receiving a Double Speed signal, this input carries the channels 1 to 4. Can also be used
as SPDIF optical input.
ADAT Out
Interface for a device receiving an ADAT signal from the HDSP 9632. Transmits channels 1 to
8. When sending a Double Speed signal, this port carries channels 1 to 4. Can also be used as
SPDIF optical output.

25.2 SPDIF

Input
The SPDIF input is configured in the Settings dialog, available by a click on the hammer symbol
in the Task Bar's system tray. The HDSP system accepts all commonly used digital sources as
well as SPDIF and AES/EBU. Channel status and copy protection are ignored.
In case the optional digital XLR breakout
cable is not used, receiving signals in
AES/EBU format requires a cable adapter.
Pins 2 and 3 of a female XLR plug are
connected individually 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 ground-free design, with transformers for coaxial digital inputs and outputs, offers a trouble-
free connection of all devices along with perfect hum rejection and full AES/EBU compatibility.
Output
In SPDIF mode, identical signals are available at both the optical and the coaxial output. An
obvious use for this would be to connect two devices, i.e. using the HDSP as a splitter (distribu-
tion 1 on 2).
Apart from the audio data itself, digital signals in SPDIF or AES/EBU format have a header con-
taining channel status information. False channel status is a common cause of malfunction. The
HDSP system ignores the received header and creates a totally new one for its output signal.
Note that in record or monitor modes, set Emphasis bits will disappear. Recordings origi-
nally done with Emphasis should always be played back with the Emphasis bit set!
This is done by selecting Emphasis in the SPDIF Out section of the Settings dialog. This setting
is updated immediately, even during playback.
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User's Guide HDSP System HDSP 9632 © RME