Gorgy Timing LEDI Mode D'emploi page 74

Evolution dans le temps
Dérive constante
► Drift:
It's the frequency difference between the two clocks. When drift is not null and
without clock correction, the offset between the two clock increase or decrease
depending on the drift sign.
The following figure shows how the evolution of the two clocks with or without drift:
Drift is null :
Evolution during time
Drift is constant :
The objective of the synchronization of a NTP client to a NTP server is to reduce
as much as possible the drift and the offset. The accuracy and stability of the client
clock is tightly coupled to the efficiency of the reduction process.
3/ There are several reasons for the presence of a drift between two clocks: generally the drift is due to the tempera-
ture difference between the two clocks.
74
Heure serveur
Heure client
Heure client
3
server time
client time
server time
client time
client time
client time
MDE-LEDInetworkITS-server-4078V1.3
Heure serveur
server time
server time