ZyXEL Communications NBG410W3G Series User Manual

Chapter 20 Maintenance

NBG410W3G Series User’s Guide

When you turn on the ZyXEL Device for the first time, the date and time start at 2000-01-01 
00:00:00. The ZyXEL Device then attempts to synchronize with an NTP time server from one 
of the 0.pool.ntp.org, 1.pool.ntp.org or 2.pool.ntp.org NTP time server pools. These are virtual 
clusters of time servers that use a round robin method to provide different NTP servers to 
clients.  
The ZyXEL Device continues to use the NTP time server pools if you do not specify a time 
server or it cannot synchronize with the time server you specified. 

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The ZyXEL Device can use the NTP time server pools regardless of the time 
protocol you select.

When the ZyXEL Device uses the NTP time server pools, it randomly selects one pool and 
tries to synchronize with a server in it. If the synchronization fails, then the ZyXEL Device 
goes through the rest of the list in order from the first one tried until either it is successful or all 
the pre-defined NTP time server pools have been tried.

The ZyXEL Device resets the time in the following instances:

• When you click 

.

• On saving your changes. 
• When the ZyXEL Device starts up.
• 24-hour intervals after starting.

Click the Synchronize Now button to get the time and date from the predefined time server or 
the time server you specified in the Time Server Address field. 
When the System Time and Date Synchronization in Process screen appears, wait up to one 
minute.

Figure 197   Synchronization in Process

Click the Return button to go back to the Time and Date screen after the time and date is 
updated successfully.