WESTERSTRAND
Document: DOK11018en02
Author: PM/CF
Analogue NTP Clock
Date: 2020-09-24
Page: 13 of 21
WESTERSTRAND URFABRIK AB
P.O. Box 133
Tel. +46 506 48000
Internet:: http://www.westerstrand.se
SE-545 23 TÖREBODA
Fax. +46 506 48051
E-mail:
NTP advanced
Advanced NTP settings
Client mode
FIRST
. Always use the first server in the list if available. If not available take next one.
This suits installations where it is more important to know exactly from where the clients get time than to have the
most accurate time. The other NTP servers in the list will then be more of backup servers.
STRATUM
. Use the NTP server with best stratum. The software sends a request to all servers in the list and uses
the time from the one with best stratum. If same stratum it will use the one that is first in the server list.
This suits installations where it is important that the time is coming from a time server high up in the pyramid.
MEDIAN
. Send a request to all servers in the list and use the median value (the NTP server that is in the middle).
This will filter out all misleading time messages.
5 minute limit
This function makes it possible to set a synchronisation window.
Check box = Off ; Accept all time messages regardless of time difference.
Check box = On ; Accept only time messages that are less than 5 minutes wrong compared to internal time.
Only accept Stratum 1
This function makes it possible to synchronise to Stratum 1 time servers only.
Check box = Off ; synchronise to time server independent of stratum level.
Check box = On ; synchronise only if time server is operating on Stratum 1 level.
