RME DSP System Multiface - Manual (Page 41)

User's Guide HDSP System Multiface II © RME
41
The word clock input of the Hammerfall DSP is a high-impedance type ensuring maximum flexi-
bility, and is therefore not terminated. If normal termination is necessary (e.g. because Ham-
merfall DSP is the last device in the chain), simply connect a T-adapter to its BNC input jack,
connect the cable supplying the word clock signal to one arm of the T-adapter and terminate the
other with a 75 Ohm resistor (as a short BNC plug).
In case Hammerfall DSP resides within a chain of devices receiving word clock, plug a T-
adapter into Hammerfall DSP’s BNC input jack and the cable supplying the word clock signal to
one end of the adapter (as above), but connect the free end to the next device in the chain via a
further BNC cable. The last device in the chain should be terminated using another T-adapter
and a terminator plug as described in the previous paragraph.
24.3 Operation
The green Lock LED on the front (STATE) will light up as soon as a word clock signal is de-
tected. To change to word clock as clock source, activate the Clock Source Word in the field
Clock Mode within the Settings dialog. The status display Current changes to Word as soon as
a valid signal is present at the BNC jack. This message has the same meaning as the green
state LED, but appears on the monitor, i.e. the user can check immediately whether a valid
word clock signal is present and is currently being used.
The word clock output of the Multiface is constantly active, providing the current sample fre-
quency as word clock signal. As a result, in Master mode the provided word clock is defined by
the currently used software. In Slave mode the provided frequency is identical to the one pre-
sent at the currently chosen clock input. When the current clock signal fails, the Multiface
switches to Master mode and adjusts itself to the next, best matching frequency (44.1 kHz, 48
kHz etc.).
Selecting Single Speed in the Settings dialog (Output Format Word) causes the output signal to
always stay within the range of 32 kHz to 48 kHz. So at 96 kHz sample rate, the output word
clock is 48 kHz.