CXR Larus 80-100-400
Issue 1, July 2006
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5−
68
5.1524
Controls and Indicators
The following controls and indicators appear on the front panel of the card:
a. The red FAIL LED lights if the on-card fuse blows or the power supply
fails.
b. The green CLOCK A/B LED lights when the corresponding clock, either A
or B, is selected.
c. The yellow INPUT A/B LED lights when the corresponding input, either A
or B, is selected.
d. The yellow OVERRIDE LED lights when automatic selection has been
overridden by manual remote selection.
e. The red OUTPUT LOSS LED lights when a loss of one or more outputs
occurs. If both A and B clocks and both input references fail, leaving no
valid signal for the output cards to select, the OUTPUT LOSS LED lights
and all outputs are suppressed.
f. The front panel MON jack allows for monitoring one of the output signals
with a standard monitoring test set. The Model 54573 and 54574 cards
each have ten outputs with independent drivers.
g. On-card jumper for Protected or Non-protected operation.
5.1525 One-wire
Interface
The one-wire interface uses two 10-bit bytes, formatted internally, to
communicate with the 54550 Information Management Card.
5.1526 Power
An on-card power converter provides the necessary circuit voltages from the
diode-combined A and B -48 volt battery supplies. The on-card fuse, if it
blows, lights the red FAIL LED and provides battery to the Fuse Alarm bus
connecting to pin 10 on the backplane terminal strip TB1.