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C H A P T E R T W E L V E
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M e r i d i a n I I U s e r M a n u a l
F R O N T - P A N E L K E Y P A D A N D D I S P L A Y
PLL
System Oscillator PLL
ANT
GPS Antenna
OPT
Option Module
PWR
System Power/Configuration
SECPS
Secondary Power Supply (option)
PRIPS
Primary Power Supply (option)
5071A
5071A Module (option)
Faults: Receiver
All GPS Receiver faults are shown on this display and their current status, either OK or FAULT.
When a fault condition exists the FLT indicator will flash. These fault indicators are the same as the
corresponding bit positions shown in the
gpsstat
fault status word FLTR. (See
Chapter 9 - Console
Port Control and Status
for information on
gpsstat
.) The faults are listed below. For details on
each fault, see
Appendix G - System Faults
.
FLSH
Receiver FLASH Writes
FPGA
Receiver FPGA Configuration
SIG
GPS Signal
DAC
Receiver Oscillator DAC
OSC
Receiver Oscillator
REF
GPS Reference Time
SYN1
Local Oscillator Synthesizer Tuning
SYN2
Local Oscillator Synthesizer
PLL
Oscillator Phase Lock
OPEN
GPS Antenna is open-circuit
SHRT
GPS Antenna is short-circuit
Faults: Antenna Fault Mask (AntFltMask)
This setting allows you to prevent the antenna fault from creating an alarm conditon. Some instal-
lations may need to mask this fault due to special antenna situations like splitters or DC blocks that
confuse the antenna detection circuit.
Faults: Signal Loss Fault Mask (SigFltMask)
This setting allows you to prevent a signal loss fault from creating an alarm condition. Some installa-
tions may need to mask this fault when operating the NTP server as a Stratum 2 server.
TFOM Fault Level
This is the threshold at which a signal loss fault will be asserted. See
Appendix A - Time Figure of
Merit
for more information. By changing the TFOM Fault Level you control the point at which the
time error will produce a signal loss fault, which then creates an alarm condition. The factory default
setting is 9, which is the maximum TFOM value.
Faults: Dual Power Input Fault Alarm Masks (PwrFltMask) (Optional)
This setting allows you to prevent a primary or secondary power supply fault from creating an alarm
condition. See
Chapter 10 - Options, Masking Dual Power Supply Fault Alarms
for more infor-
mation.
Summary of Contents for Meridian II
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