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73
5.1724
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 54577 card has four
outputs with independent drivers.
g. The unit is factory pre-set for Non-protected operation, and there is no
user option.
5.1725 One-wire
Interface
The one-wire interface allows communication of data between the 5/10 MHz
output card and the 54550 Information Management Card.
