Grass Valley LDK 4410 - Manual (Page 21)

LDK 4410 + LDK 5420 3G Fiber Transmission System User’s Guide (v1.0) 21
Chapter 2 - Base station
2.1.4 External audio level control
The camera audio level for channel 1 and 2 can be externally controlled by the base station. In
the camera menu, go to the
INSTALL > AUDIO > AUDIO GAIN MODE item and select Ext.
On the OCP, push the SETUP button and choose the Cam(era) submenu. Use the NEXT button
to scroll to the
REM AUDIO menu and select Rem. Apply a DC voltage to pins 6 and 14 of the
signalling connector to control the levels of audio channels 1 and 2 respectively, as shown in
the figure below:
The actual audio level depends on the setting of the selection switches at the back panel of the
camera adapter. When Mic is selected, the maximum gain level is -64 dBu, while maximum
Line level is -32 dBu.
2.1.5 Private data
Private data channels can be used for sending serial data via the transmission cable. For
example, electronic scriptboard or character data for a video display unit or pan and tilt data can
be transmitted to the camera.
Remember that the propagation-delay times are different for different cable lengths, especially
if a return signal is involved. At maximum lengths the total delay is at least 25 μs and can be
more than 30 μs depending on the type of cable. The duty cycle difference between input and
output is max. 5%.
Audio 1 level (pin 6) 
Audio 2 level (pin 14)
Mic/Line Mic/5 V (pin 7)
GND (pin 15)
1k
1k
1k
1k
1k
1k
1k
1k
+4.3V
+3.7V
+3.1V
+2.5V
+1.9V
+1.3V
+0.7V
0V
-22/+12dBu
-28/+4dBu
-34/-2dBu
-40/-8dBu
-46/-14dBu
-52/-20dBu
-58/-26dBu
-64/-32dBu
5
1
9
6
Private data
in
Private data
out
Function Value
Bitrate max. 100 kbit/s
Output level (high) > 4 V
Output level (low) < 4 V
Output impedance 250

Input level (high) > 2 V (max. 12 V)
Input level (low) < 2 V
Input impedance > 4.7 k
