Microsemi SyncServer S300 User Manual page 66

Web Interface
The third state is "F", the Flywheel Quality Character. The Hardware Clock has no Input
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References and Holdover has expired. (On the SyncServer S300 and S350, if a syn-
chronizing NTP association is present, the Hardware Clock is synchronized to the NTP
daemon.)
The time quality character can progress through a number of states:
1. After the user starts the SyncServer, the Sysplex port starts outputting a time string. Ini-
tially, the time quality character is "X" (time invalid).
2. When the Hardware Clock locks to an Input Reference, the time quality character
becomes " " (time valid).
3. If the Hardware Clock loses all Input References and enters Holdover, the time quality
character remains " " (time valid).
4. If Holdover expires, the time quality character becomes the Flywheel Quality Character,
determined by the user.
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):
The user sets the FQC to " " if one or more of the following are true:
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The S300 or S350 is configured with two or more synchronizing NTP associations
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and the user is satisfied with using time from other NTP associations.
The SyncServer oscillator type has superior time keeping properties compared to
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the receiving equipment. This is usually the case since most computer equipment
uses uncompensated quartz oscillators.
The user sets the FQC to "F" if the receiving equipment can handle "F" as a time quality
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character in some way that is useful and distinct from the " " or "X" time quality char-
acters.
The user sets the FQC to "X" so that the receiving equipment to handles time from NTP
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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.
Verify that the physical connection to the input connector is valid and that there are no
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cable breaks or short circuits.
On the TIMING - HW Clock page, verify that the Input Reference is Enabled and that Forced
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Timing Source is set to Auto.
For Timecode, on the REFERENCES - Timecode page, check that the Timecode Input set-
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ting matches the input signal type.
For GPS, wait for the GPS receiver to complete the GPS acquisition process and
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achieve "locked" status. Also see Operating in "Window Mode" (on page 143).
Also see TIMING - Holdover (on page 63) and TIMING - HW Clock (on page 61).
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.
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