Safran VersaSync User Manual page 130

2.8 Configuring Network Settings
With a GNSS- capable time server it is possible to combine these two con-
figurations e.g., by assigning a higher reference priority to (a.), and a lower "fall-
back" priority to (b.). For more information on reference priority configuration,
see "Configuring Input Reference Priorities" on
The NTP Stratum Model
The NTP Stratum model is a representation of the hierarchy of time servers in an
NTP network, where the Stratum level (0-15) indicates the device's distance to
the reference clock.
Stratum 0 means a device is directly connected to e.g., a GPS antenna. Stratum 0
devices cannot distribute time over a network directly, though, hence they must
be linked to a Stratum 1 time server that will distribute time to Stratum 2 servers
or clients, and so on. The higher the Stratum number, the more the timing accur-
acy and stability degrades.
The NTP protocol does not allow clients to accept time from a Stratum 15 device,
hence Stratum 15 is the lowest NTP Stratum.
A group of NTP servers at the same Stratum level (Stratum 2, for example) are
considered
the other hand, are referred to as
If VersaSync has no valid Timing System Reference, NTP Server or NTP Peers, the
NTP Stratum value is automatically downgraded to Stratum 15. This ensures that
its NTP clients will no longer use this VersaSync unit as a time reference.
Configuring "NTP Stratum 1" Operation
When the Timing System references of your VersaSync are normally available
(rather than being unavailable most of the time e.g., in areas with poor GNSS
reception), it is advisable to use the System Time as a reference to NTP, since this
provides NTP with the most accurate references. This mode is called Stratum 1
operation, since VersaSync operates as a Stratum 1 NTP server.
To configure Stratum 1 operation for VersaSync:
1. Navigate to
2. Click the GEAR icon in the
116
and VersaSync would be
referred to as Stratum 2
Stratum Synchronization.
NTP Peers to each other. NTP Servers at a higher Stratum level, on
Note: Internet Time Servers should be configured as NTP Servers
and not as NTP Peers.
MANAGEMENT > NETWORK: NTP
Stratum 2 (or higher). This operating mode can be
operation, secondary server
page 173.
NTP Servers.
NTP Services panel.
CHAPTER
operation, or NTP
Setup:
•
2 VersaSync User Manual Rev. 12