4. Appendix
4-4
TI 30A10A05-01E
4.4 Time Synchronization
Vnet/IP synchronizes the time between the Vnet/IP stations connected to a Vnet/IP
network.
n Types of clock time
A Vnet/IP station has the following types of clock time:
• System time: Managed by the Vnet/IP station system software.
• Network time: Clock time retained by the Vnet/IP station hardware. It is synchronized as
the standard time following the time master.
n Time accuracy of a Vnet/IP station
The time synchronization process standardizes the network time for all Vnet/IP stations
connected to the Vnet/IP network.
Furthermore, the system software for Vnet/IP stations updates its system time to match the
network time. The following table describes the deviation between the network time and system
time in Vnet/IP stations.
Table Accuracy of the system time
Vnet/IP stations Error from network time Time adjustment method
HIS, ENG, SENG Max. 0.5 sec
The deviation between the network time and
system time is checked. If there is a deviation
of 0.5 seconds or more, the system time is
adjusted to match the network time.
FCS, SCS, and V net router None
The system time always synchronizes with the
network time.
Aug.19,2011-00
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