TIMING - Sysplex
Autostart:
n
Yes: The Sysplex Out connector automatically outputs the time of day after system star-
tup. The user cannot stop or restart the output by entering the "C" or "R" commands.
n No: The user starts or stops the Sysplex output by sending the following characters to the
Sysplex Out connector:
n "C" or "c" to start the output.
n "R" or "r" to stop the output.
Parity: (Odd, None, Even) The parity setting of the Sysplex Out port (should match that of the
receiving device).
Flywheel Quality Character:
The user can set the Flywheel Quality Character to:
n "" (space)
n "X"
n
"F" (for Flywheel Quality Character)
About Sysplex and the Hardware Clock
To achieve the highest levels of precision and accuracy, the Sysplex Timer port gets its time
directly from the Hardware Clock. The Hardware Clock synchronizes with the highest pri-
ority Input Reference (e.g. GPS
1
, Timecode).
With the S300 and S350, if the Input References become unavailable, and Holdover expires,
the Hardware Clock synchronizes to the time the NTP daemon gets from other syn-
chronizing NTP associations (if any are present). The default configuration includes three
NTP servers on the Internet. If no synchronizing NTP associations are present, the Hard-
ware Clock is unsynchronized and uses the internal oscillator to keep time.
In the S200, S250, and S250i, if the Input References become unavailable, and Holdover
expires, the Hardware Clock is unsynchronized and uses the internal oscillator to keep time.
The time quality character at the end of the Sysplex output string reflects the synchronization
state of the Hardware Clock. The user can select the time quality character used after hol-
dover expires and the hardware clock is:
n Synchronized to the NTP daemon, or
n Using the internal oscillator to keep time.
This setting is called the Flywheel Quality Character.
About the Flywheel Quality Character
The time quality character at the end of the Sysplex output string has three states:
n The first state is "X", time is invalid. The Hardware Clock has not yet synchronized to an
Input Reference.
n The second state is "" (space), time is valid. Hardware Clock has synchronized to an
Input Reference, or is in Holdover.
1
The SyncServer S350i does not include a GPS receiver.
997-01520-02 Rev. F1.......................................................................... Page 65
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