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ATSC/DVB-3/SDI User Manual P/N 821557 Rev-A
Power Indication LED
10
This LED signals the operating condition of the power supply. The LED glows GREEN to indicate the unit is connected to
mains power and an operation voltage is present.
Phase Indication LEDs
11
These three LEDs offer instant verification of phase (polarity) conditions in the pair of channels selected for monitoring in the
left and right channel speakers. There are three LEDs; two smaller LEDs (labeled IN and OUT) on either side of a larger LED
(labeled AVG). The small IN and OUT LEDs show instantaneous phase relationships in the signal, while the larger AVG LED
indicates the average phase condition. The small IN LED on the left glows (or blinks) GREEN when signals are in-phase.
The small OUT LED on the right glows (or blinks) AMBER for out-of-phase signals. The large AVG LED indicates the
average phase condition by glowing GREEN for in-phase conditions, or RED for out-of-phase conditions. In general, it is
sufficient to regard the AVG LED (average phase condition) as adequate for proper phase monitoring. While it is normal for
stereo signals to contain some intermittant instanateous out-of-phase and in-phase conditions (small LEDs), a steady RED glow
of the larger LED almost always indicates an out-of-phase alarm condition.
SDI Signal Status Indication LED
12
This LED will indicate the status of any SDI signal entering Source 2 regardless of any monitor selection settings. This LED
shows the following conditions:
• OFF: No valid SDI signal present.
• GREEN: Valid SDI signal is present.
• RED: SDI signal not properly received.
Headphone Jack
13
Select the headphone audio sources as you would for the internal speakers. When you plug in headphones, the speakers will
mute. This jack accepts a standard 1/4" phone type stereo plug.
14
Input Status Indication LEDs (AC-3 and PCM)
These two green LEDs indicate which kind of signal is being received at the Source 1 inputs. When an AC-3 signal is being
monitored from Source 1 inputs, the left AC-3 LED will glow GREEN. When a PCM or standard AES/EBU signal is being
monitored from the Source 1 inputs, the right PCM LED will glow GREEN.
Pro-16 Selection Switch anf Indication LED
15
In the event that you are processing two different Dolby Digital Pro-16 data streams it is possible to select between the two
with this toggle switch. The LED will glow AMBER if such signals are present. In the absence of such data streams, the LED
will not be lit and the switch will be nonfunctional.
Balance Control Pot
16
This control pans the volume balance between the left and right speakers.
SDI Subgroup Select Switch (1 or 2)
17
This 2-position toggle switch allows the operator to choose whether the unit will monitor Subgroup 1 or Subgroup 2 of the
chosen SDI Group (1, 2, 3, or 4) as selected by the SDI Group Select Switch (Item 8, page 10). Subgroup selection
chooses the channels to be monitored from the selected SDI Group as follows:
Subgroup 1 = Channels 1 and 2
Subgroup 2 = Channels 3 and 4
Note that the Input Source Select Switch (Item 6) must be set to 2-SDI in order for the selected SDI signals to be actively
monitored.
12
Front Panel Features
(Continued)
© 2003 Wohler Technologies Inc. ALL rights reserved
Section 2: Operation
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