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25. Digital Connections<br />
25.1 ADAT<br />
The ADAT optical I/O of the H<strong>DSP</strong> <strong>9632</strong> is fully compatible to all ADAT equipped units. <strong>RME</strong>'s<br />
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 cable is<br />
sufficient for connection. More information on Double Speed (S/MUX) can be found in chapter<br />
33.3.<br />
ADAT In<br />
Interface for a device sending an ADAT signal to the H<strong>DSP</strong> <strong>9632</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 Out<br />
Interface for a device receiving an ADAT signal from the H<strong>DSP</strong> <strong>9632</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 />
25.2 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 />
In case the optional digital XLR breakout<br />
cable is not used, receiving signals in<br />
AES/EBU format requires a cable adapter.<br />
Pins 2 and 3 of a female XLR plug are<br />
connected individually to the two pins of a<br />
phono plug. The cable shielding is only<br />
connected to pin 1 of the XLR - not to the<br />
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 />
46<br />
Note that in record or monitor modes, set Emphasis bits will disappear. Recordings originally<br />
done with Emphasis should always be played back with the Emphasis bit set!<br />
This is done by selecting Emphasis in the SPDIF Out section of the Settings dialog. This setting<br />
is updated immediately, even during playback.<br />
User's Guide H<strong>DSP</strong> <strong>System</strong> H<strong>DSP</strong> <strong>9632</strong> © <strong>RME</strong>
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