User`s guide

User's Guide HDSP System Digiface © RME
45
26. Digital Connections
26.1 ADAT
The ADAT optical input of the HDSP system is fully compatible with all ADAT optical outputs.
RME's unsurpassed Bitclock PLL prevents clicks and drop outs even in extreme varipitch op-
eration, 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 34.3.
ADAT 1 In
Interface for a device sending an ADAT signal to the Digiface. 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 1 Out
Interface for a device receiving an ADAT signal from the Digiface. 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.
ADAT 2/3 In
Interface for a device sending an ADAT signal to the Digiface. Carries the channels 9 to 24.
When receiving a Double Speed signal, this input carries the channels 5 to 8 and 9 to 12.
ADAT 2/3 Out
Interface for a device receiving an ADAT signal from the Digiface. Transmits channels 9 to 24.
When sending a Double Speed signal, this port carries channels 5 to 8 and 9 to 12.
26.2 SPDIF
Input
The SPDIF input is configured in the Settings dialog, available by a click on the hammer sym-
bol 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.
To receive signals in AES/EBU format,
an adapter cable is required. 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 con-
nected 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 trou-
ble-free connection of all devices along with perfect hum rejection and full AES/EBU compati-
bility.
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
containing 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.