T e m p u s L X G P S U s e r M a n u a l
38
C H A P T E R F I V E
39
T e m p u s L X G P S 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
under normal operation. This fault would cause erratic operation at the next power
cycling since important parameters could be corrupt. The unit should be returned to the
factory for repair.
FPGA
FPGA Configuration - This bit indicates that the microprocessor was unable to
configure the FPGA. This would be a fatal fault and the unit should be returned to the
factory for repair.
SIG
No Signal Time-Out - This bit indicates that the unit has not been able to acquire a GPS
signal for one hour while the Time Figure of Merit has been 9, the unsynchronized
condition. This could be due to a variety of reasons. If there are no other faults that
could explain the inability to receive a signal, then there could be an antenna blockage. If
the condition persists indefinitely, the unit may need to be returned to the factory for
repair.
DAC
DAC Control Over-Range - This bit indicates that the electronic frequency control DAC
for the oscillator has reached either the high (55000) or low (10000) limit while locked to
the GPS signal. Unless the unit is being subjected to out-of-specification environmental
conditions, this would indicate that the oscillator frequency has drifted near to the end-
of-life region. This should normally only occur after about ten years of operation. The
unit will continue to function until the oscillator frequency finally reaches one of the
actual DAC endpoints. The unit should be returned to the factory for oscillator
replacement at the customer’s convenience.
ANT
Antenna Cable - This fault indicates that the GPS antenna cable is either shorted or
open-circuit. Check all antenna connections and cable integrity if this fault should occur.
POLL
No Polling Events - This fault indicates that the GPS timing subsystem is not receiving
polling requests from the NTP subsystem. This could be due to a hardware or software
failure. If the condition persists after cycling the power to the unit, this is a fatal fault and
the unit should be returned to the factory for repair.
REF
Time Reference - This fault indicates that the microprocessor has received an erroneous
time input from the GPS receiver. If the condition persists please report it to the
factory (1-877-749-3878).
ENG
GPS Engine - This fault indicates that the microprocessor is unable to establish
communications with the GPS engine. Please report this fault condition to the factory
(1-877-749-3878).
Network Setup
This display is selected from the Main Menu and provides the ability to view and modify the network
settings. The parameters include Dynamic Host Configuration Protocol (DHCP), IP address, gateway
and netmask settings. Enable DHCP to allow automatic system configuration of the network inter-
face. When DHCP is disabled the user must provide address information.
NTP Menu
The NTP Menu is selected from the Main Menu and provides access to the NTP Status and NTP
Setup displays described below:
Summary of Contents for Tempus LX GPS
Page 1: ...Smarter Timing Solutions Tempus LX GPS Network Time Server User Manual...
Page 2: ......
Page 6: ...Te m p u s L X G P S U s e r M a n u a l...
Page 36: ...Te m p u s L X G P S U s e r M a n u a l 24 C H A P T E R T H R E E...
Page 84: ...Te m p u s L X G P S U s e r M a n u a l 72 A P P E N D I X C...
Page 90: ...Te m p u s L X G P S U s e r M a n u a l 78 A P P E N D I X E...
Page 107: ...95 Te m p u s L X G P S U s e r M a n u a l S P E C I F I C AT I O N S...
Page 108: ...Te m p u s L X G P S U s e r M a n u a l 96 A P P E N D I X H...
Page 112: ...Te m p u s L X G P S U s e r M a n u a l 100 A P P E N D I X I...
Page 114: ...Te m p u s L X G P S U s e r M a n u a l 102 S P E C I A L M O D I F I C AT I O N S...
Page 115: ......