DSL-G624M Wireless 108G MIMO ADSL2/2+ Router User’s Guide
7
Wireless LAN Basics
Some basic understanding of 802.11b/g wireless technology and terminology is useful when you are setting up the
Router or any wireless access point. If you are not familiar with wireless networks please take a few minutes to learn
the basics.
Radio Transmission
Wireless LAN or WLAN devices use electromagnetic waves within a broad, unlicensed range of the radio spectrum to
transmit and receive radio signals. When a wireless access point is present, it becomes a base station for the WLAN
nodes in its broadcast range. WLAN nodes transmit digital data using FM (frequency modulation) radio signals. WLAN
devices generate a carrier wave and modulate this signal using various techniques. Digital data is superimposed onto the
carrier signal. This radio signal carries data to WLAN devices within range of the transmitting device. The antennae of
WLAN devices listen for and receive the signal. The signal is demodulated and the transmitted data extracted. The
transmission method used by the access point is called Direct Sequence Spread Spectrum (DSSS) and operates in a
range of the radio spectrum between 2.4GHz and 2.5GHz for transmission. See the technical specifications for more
details on wireless operation.
Range
Range should not be a problem in most homes or small offices. If you experience low or no signal strength in some
areas, consider positioning the Router in a location between the WLAN devices that maintains a roughly equal straight-
line distance to all devices that need to access the Router through the wireless interface. Adding more 802.11g access
points to rooms where the signal is weak can improve signal strength. Read the section about placement of the Router
titled Location in the next chapter, Hardware Installation, for more information.
SSID
Wireless networks use an SSID (Service Set Identifier) to allow wireless devices to roam within the range of the
network. Wireless devices that wish to communicate with each other must use the same SSID. Several access points
can be set up using the same SSID so that wireless stations can move from one location to another without losing
connection to the wireless network.
The DSL-G624M operates in
Infrastructure
mode. It controls network access on the wireless interface in its broadcast
area. It will allow access to the wireless network to devices using the correct SSID after a negotiation process takes
place. By default he DSL-G624M broadcasts its SSID so that any wireless station in range can learn the SSID and ask
permission to associate with it. Many wireless adapters are able to survey or scan the wireless environment for access
points. An access point in Infrastructure mode allows wireless devices to survey that network and select an access point
with which to associate. You may disable SSID broadcasting in the web manager’s wireless menu.
Wireless Security
Various security options are available on the DSL-G624M including open or WEP and WPA (including WPA-PSK).
Authentication may use an open system or a shared key. For details on these methods and how to use them, please read
the wireless LAN configuration information in chapters 3 (Basic Router Configuration) and 4 (Advanced Router
Configuration) below.
Summary of Contents for DSL-G624M
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