Sierra Video ADA-108 - Manual (Page 20)

SIERRA VIDEO
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rear of the frame with a source termination of 75 Ohms for each BNC. The feedback
values are chosen for best frequency response and minimum peaking.
Power
The POWER LED has two diodes, one Red and one Green. Either LED can be on by
itself or both on together which will give an Orange color for the POWER LED.
Please refer the following descriptions using sheet 2 of the schematic and the block
diagram. J2 connects the board to the mid-plane connector where it gets +12V and -7.5V
supply voltages. J2 also has one pin that indicates the slot ID, 1 through 20 in the 20 slot
frame and 1 through 10 in the 10 slot frame. The CAN bus is also on this connector and
allows the micro-controller on each board in the frame to communicate with the network
card. There are also two buffered reference inputs that are distributed to each board in
the frame but not used by this board. There are three regulated voltages on this board,
+/-5V for the video amplifiers and +3.3V for the micro-controller and logic circuits. Each
regulator is a linear regulator. U13 regulates the +5V and U15 regulates the -5V supplies.
U14 is for the +3.3V supply.
An input current monitors, U11 and U12, monitors both the positive and negative supply
inputs respectively. Supply voltages are also measured by the micro-controller and
reported to the openGear control program, Dashboard. By knowing both the supply
voltages and supply currents, the micro-controller calculates and displays the power
consumption for the board in Dashboard.
Power LED Behavior
Behavior Condition
Off No Power
Steady Green Power and Status OK
Steady Red Card is not operational or wrong Rear I/O ID
Steady Orange Card is starting up
Alternate Orange/Green Primary signal or reference input missing