use the System Time as a reference to NTP, since this provides NTP with the most accurate ref-
erences. This mode is called Stratum 1 operation, since SecureSync operates as a Stratum1 NTP
server.
To configure Stratum 1 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 Stratum 1 tab.
4. Check all of the three options:
Enable Stratum 1 Operation
Checking this option will cause the NTP Service to use the System Time provided
by the Timing System input.
Prefer Stratum1
This option configures NTP to “weigh” the Timing System input heavier than input
from other NTP servers for its selection (The Timing System inputs are normally
more accurate than other NTP servers).
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-
aable 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 Timing
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 reference.
5.
Click the Submit button.
2.14.7.3 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 con-
figuring 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.
2.14 Configuring NTP
CHAPTER 2 • SecureSync User Reference Guide Rev. 26
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