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3.5.
PHYSICAL
7700 or 7701 frame mounting:
Number of slots:
Stand Alone Enclosure:
Dimensions:
Weight:
4.
STATUS INDICATORS
The 7720ADC-A4 has 2 LED Status indicators and a 4 digit alphanumeric display on the front card edge to
show operational status of the card at a glance. The card edge pushbutton is used to select various
displays on the alphanumeric display. The location of the status LEDs is shown in Figure 4.
4.1.
MODULE STATUS LEDS
MODULE OK
LOCAL FAULT
4.2.
DOT-MATRIX DISPLAY
Additional signal and status monitoring is provided via the 4-digit dot-matrix display located on the card
edge. The rotary switch position determines what is displayed on the dot matrix display. When it is set to
position 0, the input audio levels are shown using bar graphs on the display. Pressing the toggle switch
up when the rotary switch is a position 0 will orient the display vertically; pressing the toggle switch down
will orient the display horizontally. When it is set to 1 to 4 the gain level for each of the channels will be
displayed, and can be set using the toggle switch (see section 5.1.1).
4.2.1. Audio Level Bar Graphs
When the rotary switch is set to position 0, each section of the dot matrix display shows a bar graph
representation of the level for one of the audio channels. Channel 1 is shown on the left (top) section and
channel 4 is shown on the right (bottom) section. Each section of the display is comprised of a 5 x 5 array
of dots. Diagonal rows of dots represent one of 9 different signal levels as shown below.
Level 1
Level 2
The signal levels shown in Table 1 are nominally in dBFS units. Table 1 also shows the levels in dBu
when the gain is set to 0 dB (see section 5.1.1) and the level jumpers are set so that 24 dBu = 0 dBFS
1
14 " L x 4.5 " W x 1.9 " H
(355 mm L x 114 mm W x 48 mm H)
approx. 1.5 lbs. (0.7 Kg)
This Green LED will be On when the module is operating properly
This Red LED makes it easy to identify one module in a frame that is missing an
essential input or has another fault.
The LED will blink on and off if the microprocessor is not running.
The LED will be on solid when there is a fault in the module power supply.
Level 3
Level 4
Figure 3: Bar Graph Displays
7720ADC-A4 Analog Audio to AES Converter
Level 5
Level 6
Revision 1.1
7700 MultiFrame Manual
Level 7
Level 8
7720ADC-A4-5
Level 9
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