ZyXEL Communications ISG50 User Manual

 Chapter 52 System

ISG50 User’s Guide

Get from Time 
Server

Select this radio button to have the ISG50 get the time and date from the time 
server you specify below. The ISG50 requests time and date settings from the 
time server under the following circumstances.

•

When the ISG50 starts up.

•

When you click Apply or Synchronize Now in this screen.

•

24-hour intervals after starting up.

Time Server 
Address

Enter the IP address or URL of your time server. Check with your ISP/network 
administrator if you are unsure of this information.

Sync. Now

Click this button to have the ISG50 get the time and date from a time server 
(see the Time Server Address field). This also saves your changes (except 
the daylight saving settings).

Time Zone Setup

Time Zone

Choose the time zone of your location. This will set the time difference between 
your time zone and Greenwich Mean Time (GMT). 

Enable Daylight 
Saving 

Daylight saving is a period from late spring to early fall when many countries 
set their clocks ahead of normal local time by one hour to give more daytime 
light in the evening.

Select this option if you use Daylight Saving Time.

Start Date

Configure the day and time when Daylight Saving Time starts if you selected 
Enable Daylight Saving. The at field uses the 24 hour format. Here are a 
couple of examples:

Daylight Saving Time starts in most parts of the United States on the second 
Sunday of March. Each time zone in the United States starts using Daylight 
Saving Time at 2 A.M. local time. So in the United States you would select 
Second, Sunday, March and type 2 in the at field.

Daylight Saving Time starts in the European Union on the last Sunday of March. 
All of the time zones in the European Union start using Daylight Saving Time at 
the same moment (1 A.M. GMT or UTC). So in the European Union you would 
select Last, Sunday, March. The time you type in the at field depends on your 
time zone. In Germany for instance, you would type 2 because Germany's time 
zone is one hour ahead of GMT or UTC (GMT+1). 

End Date

Configure the day and time when Daylight Saving Time ends if you selected 
Enable Daylight Saving. The at field uses the 24 hour format. Here are a 
couple of examples:

Daylight Saving Time ends in the United States on the first Sunday of 
November. Each time zone in the United States stops using Daylight Saving 
Time at 2 A.M. local time. So in the United States you would select First, 
Sunday, November and type 2 in the at field.

Daylight Saving Time ends in the European Union on the last Sunday of 
October. All of the time zones in the European Union stop using Daylight Saving 
Time at the same moment (1 A.M. GMT or UTC). So in the European Union you 
would select Last, Sunday, October. The time you type in the at field depends 
on your time zone. In Germany for instance, you would type 2 because 
Germany's time zone is one hour ahead of GMT or UTC (GMT+1). 

Offset

Specify how much the clock changes when daylight saving begins and ends. 

Enter a number from 1 to 5.5 (by 0.5 increments). 

For example, if you set this field to 3.5, a log occurred at 6 P.M. in local official 
time will appear as if it had occurred at 10:30 P.M.

Apply

Click Apply to save your changes back to the ISG50.

Reset

Click Reset to return the screen to its last-saved settings. 

Configuration > System > Date and Time (continued)