Note: NTP Passive Timing Source: Due to its poor performance NTP timing
sources are always forced to be “Passive Only”. However, adding them to
the configuration will provide a more robust solution as they can be used to
cross-validate the active timing source.
5.6.2 Info/Overview
This panel provides an overview of the status for each NTP instance:
OID Name Value Type Description
3.70x5.x
ntp/x/info/xxx Information of the x
th
NTP timing source
(x=[1-5]).
3.70x5.1 Server
Status
• Disabled
• OK
• NTP sync error
• NTP stopped
replying
NTP server status. Warns if the NTP server cannot be
reached.
3.70x5.0 Offset <Integer> Time offset between the device and the NTP ref-
erence server (in seconds).
3.70x5.2 Stratum • Stratum 0
• Stratum 1
• Stratum 2
• Stratum 3
• Stratum 4
• Stratum 15
• Undefined
Stratum announced by the corresponding NTP server.
5.6.3 Stratum Levels
The NTP stratum is a measure for synchronization distance from the reference clock which
might not always reflect the timing performance such as jitter or delay. In other words, a
server synchronized to a stratum (n) server will be running at stratum (n+1) where the
upper limit for stratum is 15.
Stratum 0: Corresponds to the reference clock sources that relays Coordinated
Universal Time (UTC). Stratum 0 servers should only be deployed within a met-
rology institute and must not be available on the internet.
Stratum 1: Corresponds to the servers that are directly synchronized to stratum 0.
They can also be considered a Primary Reference Source (PRS) such as calibrated
GNSS receiver or Atomic Clocks. The Grand-Master node is typically connected to
an external reference that provides NTP with Stratum 1.
Stratum 2: They are synchronized by a stratum 1 clock. It is the default stratum level
when NTP provider is set in manual mode.
Stratum 3: They are synchronized by a stratum 2 clock.
5.6 NTP
CHAPTER 5 • WR-Z16 User Manual Rev. v3.4
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