Ntp Output Timescale - Spectracom SecureSync User Reference Manual

If SecureSync has no valid Timing System Reference, NTP Server or NTP Peers, the NTP
Stratum value is automatically increased to Stratum 15. This ensures no NTP clients can use it as
a time reference when unsynchronized. This feature utilizes automatic enabling and disabling of
the Local Clock Reference driver to force Stratum 15. The automatic Local Clock Reference mode
is disabled in NTP Expert mode if the user configures a Local Clock Reference Driver, or if the
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3.4.3

NTP Output Timescale

The timescale for the time that is provided to the network nodes via the NTP time stamps is
determined by the Timescale selected in the SecureSync System Time Setup Page, accessed
through the Web UI at MANAGEMENT/OTHER/Time Management . See "The Time Man-
agement Screen" on page 168. If the Timescale in System Time Setup is selected as "UTC", the
network PCs will receive UTC time via NTP. If "GPS" is selected instead, the network PCs will
receive GPS time via NTP. When the Timescale is set to "GPS", the GPS-to-UTC offset on the
Setup/Time Management page must be set correctly. Typically, UTC is the desired Timescale for
network synchronization.
The MANAGEMENT/NETWORK/NTP Setup page allows NTP broadcast capability to be
enabled (this feature very rarely needs to be enabled) and allows the network access of the NTP
time stamps to be limited to only certain clients on the network (this feature is also rarely used).
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In the "NTP service" field, select "Disabled', then click Submit to disable NTP, then
Select "Enabled" and click Submit again to re-enable NTP. Changes made will now
take effect and NTP operation will be restored shortly after this operation is per-
formed.
# DISABLE_AUTO_LOCAL
NOTE – IMPORTANT: Make sure the desired timescale for the NTP output is selec-
ted in the System Time Setup.
Having the incorrect timescale selected can result an undesired time error in the
NTP clients that are synchronizing to SecureSync via NTP. As of July 2015, the off-
set between UTC and GPS time is 17 seconds.
NOTE – IMPORTANT: Configuration changes made to SecureSync's NTP con-
figurations do not take effect until the NTP Service is Disabled and then Enabled (or
until SecureSync is rebooted/power cycled). The NTP service can be stopped and
started from the MANAGMENT/NTP Setup in the NTP Services panel. Once NTP
has been re-enabled, NTP will be available again for network synchronization within
a few minutes.
3.4 Network Time Protocol (NTP)
is added to the NTP configuration file.
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