CXR Larus 80-100-400
Issue 1, July 2006
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5−
54
·
Any single card failure.
· Any combination of failures that leaves at least one clock in its
tracking mode and at least one set of outputs available from
odd/even pairs of output cards, e.g. OUT 1 (slot J9) and OUT 2 (slot
J10).
b. Major alarms result from:
·
Both input cards A and B invalid.
·
Clock A and Clock B not tracking.
·
Two or more output cards (even and odd) in alarm.
· Bit slip between A and B clocks reported by the 54541/54542
Synchronization Monitor Card as an encoded alarm.
·
Encoded major alarm from a clock card or SMC.
c. The track and hold and sync monitor cards are able to change the alarm
severity by the following convention:
·
HIGH output equals no alarm.
·
LOW output equals a Minor alarm.
·
PULSE output equals a Major alarm.
5.1222
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 yellow -48VA LED lights if -48VA is not present.
c. The yellow -48VB LED lights if -48VB is not present.
d. The red MAJOR LED indicates a Major alarm condition.
e. The yellow MINOR LED indicates a Minor alarm condition.
f. The alarm cutoff (ACO) pushbutton shuts off the audible alarms and
lights the yellow ACO LED. If another alarm comes on, the audible
alarm is once more activated. When the alarm condition clears, all
alarms are reset and the ACO LED goes out.
5.1223 One-wire
Interface
The one-wire interface allows communication of data between the 54560
and the 54550 Information Management Card.
5.1224 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
