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24. Digital Connections<br />
24.1 ADAT<br />
The ADAT optical input of the H<strong>DSP</strong> system is fully compatible with all ADAT optical outputs.<br />
<strong>RME</strong>'s unsurpassed Bitclock PLL prevents clicks and drop outs even in extreme varipitch operation,<br />
and guarantees a fast and low jitter lock to the digital input signal. A usual TOSLINK<br />
cable is sufficient for connection. More information on Double Speed (S/MUX) can be found in<br />
chapter 32.3.<br />
ADAT 1 In<br />
Interface for a device sending an ADAT signal to the H<strong>DSP</strong> <strong>9652</strong>. Carries the channels 1 to 8.<br />
When receiving a Double Speed signal, this input carries the channels 1 to 4. Can also be used<br />
as SPDIF optical input.<br />
ADAT 1 Out<br />
Interface for a device receiving an ADAT signal from the H<strong>DSP</strong> <strong>9652</strong>. Transmits channels 1 to<br />
8. When sending a Double Speed signal, this port carries channels 1 to 4. Can also be used as<br />
SPDIF optical output.<br />
ADAT 2/3 In<br />
Interface for a device sending an ADAT signal to the H<strong>DSP</strong> <strong>9652</strong>. Carries the channels 9 to 24.<br />
When receiving a Double Speed signal, this input carries the channels 5 to 8 and 9 to 12.<br />
ADAT 2/3 Out<br />
Interface for a device receiving an ADAT signal from the H<strong>DSP</strong> <strong>9652</strong>. Transmits channels 9 to<br />
24. When sending a Double Speed signal, this port carries channels 5 to 8 and 9 to 12.<br />
24.2 SPDIF<br />
Input<br />
The SPDIF input is configured in the Settings dialog, available by a click on the hammer symbol<br />
in the Task Bar's system tray. The H<strong>DSP</strong> system accepts all commonly used digital sources<br />
as well as SPDIF and AES/EBU. Channel status and copy protection are ignored.<br />
To receive signals in AES/EBU format, an<br />
adapter cable is required. Pins 2 and 3 of<br />
a female XLR plug are connected individually<br />
to the two pins of a phono plug.<br />
The cable shielding is only connected to<br />
pin 1 of the XLR - not to the phono plug.<br />
The ground-free design, with transformers for coaxial digital inputs and outputs, offers a trouble-free<br />
connection of all devices along with perfect hum rejection and full AES/EBU compatibility.<br />
Output<br />
In SPDIF mode, identical signals are available at both the optical and the coaxial output. An<br />
obvious use for this would be to connect two devices, i.e. using the H<strong>DSP</strong> as a splitter (distribution<br />
1 on 2).<br />
Apart from the audio data itself, digital signals in SPDIF or AES/EBU format have a header<br />
containing channel status information. False channel status is a common cause of malfunction.<br />
The H<strong>DSP</strong> system ignores the received header and creates a totally new one for its output<br />
signal.<br />
40<br />
User's Guide H<strong>DSP</strong> <strong>System</strong> H<strong>DSP</strong> <strong>9652</strong> © <strong>RME</strong>