First Operation; Setup And Operation; General - RME Audio HDSP 9632 User Manual

8. First Operation

After fitting the WCM (see 7. Hardware Installation) and switching on the computer, activate the
push button switch 'Term' located between the BNC jacks. Provided the module is correctly
connected to the HDSP 9632, the yellow LED beside the switch must light up.
* Technical note: The LED VD108, located on the WCM board, indicates whether the WCM
gets the needed 5V from the HDSP or not. This LED is not visible from the outside.

9. Setup and Operation

9.1 General

As soon as a valid word clock signal is present the green 'Lock' LED beside the input jack lights
up.
To switch from the HDSP's
internal clock to
WCM's clock, activate the
mode 'Word Clock' in the
field 'Pref. Sync Ref' of the
Settings dialog. Also select
'AutoSync' in the
'Clock Mode'. The field
'System Clock' will indicate
that the card has changed
into clock mode 'Slave'.
The external signal is now
used as reference. At the
same time, the frequency
(Freq.) of the input signal
is displayed.
The word clock outputs of the WCM are always active. They provide the current sample fre-
quency of the HDSP 9632 as word clock signal. As long as the HDSP 9632 operates in 'Master'
mode (field 'Clock Mode'), the word clock will be fixed to the current sample rate. In 'AutoSync'
mode the sample rate is identical to the one present at the currently chosen input (Pref. Sync
Ref). Without a valid input signal, the card will change between the inputs automatically. As
long as no valid input signal is found, the card will stay in Master mode.
The word clock signal received by the WCM be distributed to other devices by using the
WCM's word clock output. With this the usual T-adapter can be avoided, and the WCM oper-
ates as Signal Refresher. This kind of operation is highly recommended, because
Input and output are phase-locked and in phase (0°) to each other
SteadyClock removes nearly all jitter from the input signal
the exceptional input of the WCM (1 Vpp sensitivity instead of the usual 2.5 Vpp, dc cut,
Signal Adaptation Circuit) plus SteadyClock guarantee a secure function also with most
critical word clock signals.
the
field
User's Guide HDSP 9632 WCM © RME
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