Stratum - Microsemi SyncServer S200 User Manual

Stratum

This is an eight-bit integer that indicates the position of an NTP node within an NTP timing
hierarchy. It is calculated by adding 1 to the stratum of the NTP system peer.
For the SyncServer, the stratum values are defined as follows:
Stratum Definition
0 Hardware Clock when locked.
1 Primary server
2-15 Secondary server
16-255 Unsynchronized, unreachable.
For example, the SyncServer is:
stratum 1 when the Hardware Clock (stratum 0) is synchronized to an input reference, in
n
holdover mode, or in freerun mode.
stratum 2 through 15 when it is synchronized to a remote NTP server.
n
stratum 16 when it is unsynchronized, indicating that it is searching for a valid source of
n
timing information.
The settings on the NTP - Prefs (on page 40) page affect stratum behavior.
Timing Engine
This is an equivalent term for "Hardware Clock". Please see the glossary entry for Hardware
Clock (on page 179).
Timing Source
A Timing Source is a reference source, such as GPS, that is available to the Hardware
Clock. The number and type of Timing Sources available varies by model. See TIMING - HW
Clock, Forced Timing Source for specific examples. See the TIMING - HW Clock (on page
42) topic for more information.
UTC
From Wikipedia: "Coordinated Universal Time (UTC) is a high-precision atomic time standard.
UTC has uniform seconds defined by International Atomic Time (TAI), with leap seconds
announced at irregular intervals to compensate for the earth's slowing rotation and other dis-
crepancies. Leap seconds allow UTC to closely track Universal Time (UT), a time standard
based not on the uniform passage of seconds, but on Earth's angular rotation."
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Stratum
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