TIMING Tab
5. If an Input Reference becomes available again, the Hardware Clock synchronizes with it
and the time quality character becomes " " (time valid) again.
Usually there is a short delay between the Hardware Clock changing state and the time qual-
ity character changing.
Here are some potential guidelines for configuring the Flywheel Quality Character (FQC):
n The user sets the FQC to " " if one or more of the following are true:
n The SyncServer is configured with two or more synchronizing NTP associations
and the user is satisfied with using time from other NTP associations.
n The SyncServer oscillator type has superior time keeping properties compared to
the receiving equipment. This is usually the case since most computer equipment
uses uncompensated quartz oscillators.
n The user sets the FQC to "F" if the receiving equipment can handle "F" as a time quality
character in some way that is useful and distinct from the "" or "X" time quality char-
acters.
n The user sets the FQC to "X" so that the receiving equipment to handles time from NTP
or the Hardware Clock internal oscillator as "X" (time invalid).
Troubleshooting: If the time quality character remains "X" (time invalid) even though Input
References are connected to the SyncServer.
n Verify that the physical connection to the input connector is valid and that there are no
cable breaks or short circuits.
n
On the TIMING - HW Clock page, verify that the Input Reference is Enabled and that Forced
Timing Source is set to Auto.
n
For IRIG-B, on the REFERENCES - IRIG-B page, check that the Timecode Input setting
matches the input signal type.
n For GPS, wait for the GPS receiver to complete the GPS acquisition process and
achieve "locked" status. Also see Operating in "Window Mode" (on page 102).
Also see TIMING - Holdover (on page 45) and TIMING - HW Clock.
Note: If the user sets Forced Timing Source on the TIMING - HW Clock page to Free Run, the
Flywheel Quality Character in effect at that moment remains in effect thereafter.
997-01520-02 Rev. G2.......................................................................... Page 49
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