Ntp - Config - Microsemi SyncServer S300 User Manual

NTP - Config
synchronized. The stratum reported by the SyncServer is incremented by one from its syn-
chronizing peer. For example, while synchronized to the Hardware Clock (Stratum 0), the
stratum of the SyncServer is one (Stratum 1).
Poll: The length of the interval (in seconds) with which the SyncServer polls the remote
server, usually starting at 64 seconds and gradually increasing to 1024 seconds. Valid values
range from 16 to 65535, increasing by powers of 2. The polling interval for the Hardware
Clock is fixed at 16 seconds. The user-configured Minimum and Maximum Poll Interval set-
tings on the NTP - Config page limit this interval.
Reach: This is an 8-bit shift register that keeps track of the last 8 attempts to reach the remote
end of the association. New bits are added to the rightmost end of the register (1 for reached
or 0 for unreached) and old bits "fall off" the left hand side. The shift register is represented in
octal. For example, by converting "377" from octal to binary, one gets "11111111", indicating
8 successful polls. For a sequence of eight successful polling attempts on a new association,
the octal value of Reach increases as follows: 1, 3, 7, 17, 37, 77, 177, 377. If the value isn't
one of those just shown, there may be a problem polling the remote end of the association. If
the value remains at 0, or decreases to 0, the association is becoming unreachable. The
reach value stays 0 if the SyncServer is a broadcast or multicast server.
Delay: The total delay, in seconds, of the round trip to the remote end of the NTP association.
For example, a value of "0.07817" equals approximately 78 milliseconds. The Delay for the
Hardware Clock is "0". For most NTP associations, typical values range from tens to hun-
dreds of milliseconds. The NTP daemon's clock selection algorithm gives preference to
lower Delay values.
Offset: The time offset between the SyncServer and the remote server, in seconds, of the last
poll. The NTP daemon's clock selection algorithm gives preference to lower Offset values.
The Offset for the Hardware Clock is usually in the microsecond range. For external NTP
associations, the offset is affected by the time base of the remote node and the char-
acteristics of the network path, with values typically in the 1 - 10 millisecond range.
Disp: Dispersion represents the maximum error of the SyncServer relative to the NTP asso-
ciation. There are two components in dispersion, those determined by the peer relative to the
primary reference source of standard time and those measured by the SyncServer relative
to the peer. They provide not only precision measurements of offset and delay, but also defin-
itive maximum error bounds, so that the SyncServer can determine not only the time, but the
quality of the time as well.
RESTART Button
After changing the NTP configuration, click the RESTART button to put the new configuration
into effect. While the NTP daemon restarts, its services are temporarily unavailable, and it
generates the following alarm events: NTP Stratum Change, NTP System Peer Change,
NTP Leap Change.

NTP - Config

Use this page to create, edit, or delete NTP associations.
Note: The SyncServer S350i does not include either a modem or GPS receiver.
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