ZyXEL Communications ES3500 Series 8.4 Introduction to VLANs, Time, 2:00, Apply, mm-dd), Cancel, New Time, End Date, Time Zone, Start Date, (hh:min:ss), Current Date, New Date (yyyy

	Chapter 8 Basic Setting
Table 14 Basic Setting > General Setup (continued)
LABEL	DESCRIPTION
New Time	Enter the new time in hour, minute and second format. The new time then appears in the
(hh:min:ss)	Current Time field after you click Apply.
Current Date	This field displays the date you open this menu.
New Date (yyyy-	Enter the new date in year, month and day format. The new date then appears in the
mm-dd)	Current Date field after you click Apply.
Time Zone	Select the time difference between UTC (Universal Time Coordinated, formerly known as
	GMT, Greenwich Mean Time) and your time zone from the drop-down list box.
Daylight Saving	Daylight saving is a period from late spring to early fall when many countries set their
Time	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 Daylight
	Saving Time. The time is displayed in 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 2:00.
	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
	and the last field depends on your time zone. In Germany for instance, you would select
	2:00 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 Daylight
	Saving Time. The time 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 2:00.
	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
	and the last field depends on your time zone. In Germany for instance, you would select
	2:00 because Germany's time zone is one hour ahead of GMT or UTC (GMT+1).
Apply	Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
	changes if it is turned off or loses power, so use the Save link on the top navigation panel
	to save your changes to the non-volatile memory when you are done configuring.
Cancel	Click Cancel to begin configuring this screen afresh.

8.4 Introduction to VLANs

A VLAN (Virtual Local Area Network) allows a physical network to be partitioned into multiple logical networks. Devices on a logical network belong to one group. A device can belong to more than one group. With VLAN, a device cannot directly talk to or hear from devices that are not in the same group(s); the traffic must first go through a router.

In MTU (Multi-Tenant Unit) applications, VLAN is vital in providing isolation and security among the subscribers. When properly configured, VLAN prevents one subscriber from accessing the network resources of another on the same LAN, thus a user will not see the printers and hard disks of another user in the same building.

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ES3500 Series User’s Guide