Gps Time Accuracy Transient Event; Gps Clock Bias Transient Event; Gps Tracking Success Alarm - Symmetricom TimeSource 2500 Manual

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GPS Time Accuracy Transient Event

The GPS receiver estimates the current accuracy of the timing
solution. The threshold for good timing solutions is 750 ns.
Maintenance action required: None.

GPS Clock Bias Transient Event

The clock bias transient event indicates the quality of the current
timing solution data. The transient event is reported if there are no
valid satellites to obtain a good timing solution, or if the current
timing accuracy estimate exceeds the maximum threshold.
Maintenance action required: None.

GPS Tracking Success Alarm

This alarm indicates that the GPS receiver is not achieving an
acceptable level of successful tracking. The system calculates a
24 hour average success rate every hour. This alarm is reported if
the average daily success rate is less than 40 percent.
Maintenance action required: Check that the latitude, longitude,
altitude, elevation mask, GPS fix mode, and cable delay
information have been properly entered, via the Installation
screen. Entering latitude in the longitude window, and vice versa,
are common user errors. If the alarm condition persists, the
window or wall may not a have a large enough view of the sky for
the system to stabilize. If possible, move the antenna to a window
or wall with an improved view of the sky.
Note:
If the TimeSource 2500 suddenly stops tracking satellites,
and does not reacquire any satellites for 24 hours or more, the sys-
tem critical memory may have become corrupted. Reset the GPS
receiver (using the Reset screen). If the condition persists, replace
the shelf.
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TimeSource 2500