However, if the Timing System inputs are not normally available (such as with
intermittent GNSS reception or no other inputs are available), it may be desir-
able NOT to prefer the Timing System over an NTP reference, in which case
this box should not be checked.
Enable Stratum1 1PPS
This option determines whether or not NTP uses the 1PPS input from the Tim-
ing System. The 1PPS input to NTP needs to correlate with its “Time” input. If
the Time and PPS inputs are originating from the same source, they will be
correlated. However, if the time is originating from another NTP server, but
the 1PPS is being derived by the Timing System, the two inputs may not
always correlate. Without this correlation, NTP performance will be degraded.
In such a scenario, it is best NOT to use the System Time’s 1PPS as a ref-
erence.
5.
Click the Submit button.
2.15.7.3 Configuring "NTP Stratum Synchronization"
NTP Stratum Synchronization refers to the concept of using a different NTP Server or
Peer as your primary reference (instead of e.g., GNSS). This will make the SecureSync you
are configuring a Stratum2 server, since the other server is Stratum1.
To configure Stratum 2 (or greater) operation for SecureSync:
1.
Navigate to MANAGEMENT > NETWORK: NTP Setup:
2.
Click the GEAR icon in the NTP Services panel.
3.
The Edit NTP Services window will display. Click the Stratum1 tab.
4.
Uncheck all three options:
Enable Stratum 1 Operation
Uncheck this option. When the checkbox Enable Stratum1 is unchecked,
the system will always synchronize its .time to an NTP server.
Prefer Stratum1
Uncheck this option to prevent SecureSync's NTP service from “weighing”
the Timing System input heavier than input from other NTP servers. Thus, dur-
ing normal operation, the time provided by the external Stratum1 NTP server
will be used (unless its quality is determined to be low).
Note: If enabled, this function would give GPS additional
“weight” for NTP to select the GNSS input over other NTP
Servers.
104
CHAPTER 2 • SecureSync 2400 User Manual Rev. 2
2.15 Configure NTP
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