Option 2; Figure 14 Example, Using Digital Gateway As Ntp Server - ABB LVS Digital Manual

COM MU NI CAT IO N I NT ERFACE CON N ECTI ON

5.3.2 Option 2

One Digital Gateway in the network is configured as NTP Server (Time Sync mode = RTC). In
this case the date and time for this Digital Gateway must be set through the web interface.
All other Digital Gateway are configured as NTP Client (Time Sync mode = NTP) and their in-
ternal clock is synchronized by the NTP Server Digital Gateway.
In case of a power down the Digital Gateway buffers the system time (RTC) for about
3 hours. Afterwards its internal clock is reset to 2009-01-01.
This time synchronization method is less accurate than Option 1 since one Digital
Gateway internal clock is used as time reference and not a high accurate GPS synchro-
nized Time Server.

Figure 14 Example, using Digital Gateway as NTP Server

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