D-Link DWA-140 manual Adsl Technology, Range

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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. In this way, digital data can then be 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. DSSS is the preferred method used on many 802.11b and 802.11g devices.

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 802.11b 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-G604T 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. The DSL-G604T 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.

It is important to understand the difference between the SSID and a BSSID (Basic Service Set Identifier) or Preferred BSSID. The Preferred BSSID is defined by wireless stations to designate an access point used for access to the wireless network. The Preferred BSSID is the MAC address of the access point. Therefore any wireless stations (wireless clients) that use the DSL-G604T through the wireless interface must use its MAC address for the Preferred BSSID. A wireless station that scans the network for available access points may present the user with a choice of access points identified by their BSSID.

ADSL Technology

Asymmetric Digital Subscriber Line (ADSL) is a broadband technology that utilizes ordinary copper telephone lines to enable high-speed digital data transmission and interactive multimedia applications for business and residential customers.

ADSL greatly increases the signal-carrying capacity of copper telephone lines for faster downloads and more reliable connectivity without interfering with regular telephone services. ADSL devices make it possible to enjoy benefits such as high-speed Internet access without experiencing any loss of quality or disruption of voice/fax telephone capabilities.

ADSL provides a dedicated service over a single telephone line operating at speeds of up to 8 Mbps downstream and up to 640 Kbps upstream, depending on local telephone line conditions. A secure point-to-point connection is established between the user and the central office of the service provider.

D-Link ADSL devices incorporate the recommendations of the ADSL Forum regarding framing, data format, and upper layer protocols.

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Contents DSL-G604T Warnung Table of Contents Advanced Router Management Installation Requirements About This User’s GuideBefore You Start About Clip Connections RFC 802.11b Wireless LAN ConfigurationEthernet Port NIC Adapter Additional SoftwareInformation you will need from your Adsl service provider LAN Subnet Mask for the DSL-G604T Packing ListWhat is ADSL? IntroductionRouter Description and Operation Router Features Standards Compatibility and Compliance Front Panel Display Packing ListRear Panel Connections Radio Transmission Introduction to 802.11b Wireless802.11g Wireless Wireless LAN BasicsRange Adsl TechnologyLocation Hardware InstallationFactory Reset Button Power on RouterConnect Router to Ethernet Hub or Switch to Router ConnectionNetwork Connections Connect Adsl LineComputer to Router Connection Basic Router Configuration Configuring IP Settings on Your ComputerWAN Configuration Summary Configure Windows XP for Dhcp Windows Configure Windows 2000 for Dhcp Configure Windows ME for DhcpWindows ME Windows 95 and Windows Configure Windows 95 and Windows 98 for Dhcp Configure Windows NT 4.0 for DhcpWindows NT 4.0 Workstations Login to Home Access the Configuration ManagerHome Status Information window Configure the RouterOpening Setup window Setup MenuWireless configuration window Wireless SettingsWEP configuration window Wireless Security802.1X 1X configuration windowPSK String WPA Wi-Fi Protected AccessModem Setup Configure Connection 1 for PPPoAPPPoA Connection 1 Setup menu Change the Connection Type Configure Connection 1 for PPPoEPage 11. Setup Configure Connection 1 for Bridge Configure Connection 1 for Bridge12. Setup Configure Connection 1 for Static IP for the WAN Configure Connection 1 for Static IP for WANPage Configure Connection 1 for Dhcp for WAN 14. Setup Configure Connection 1 for Clip IPoA Configure Connection 1 for ClipNew Connection Example 1 Create a New PPPoE Connection Create a New ConnectionNew Connection Example 2 Create a New Bridge Connection 16. Set up a New Connection ConnectionLease Time Dhcp Configuration for LANDhcp Parameter Description Start IP End IP18. Configure Dhcp Relay Service Enable Dhcp RelayManagement IP 19. Configure Management IP20. Router Tools Menus Save Configuration Changes22. Changes permanently saved message Advanced Router Management Advanced setup main menuAdvanced UPnP window UPnPLAN Clients LAN Clients SetupAdvanced Port Forwarding window Port ForwardingServers Category Available Rules GamesAudio/Video ApplicationsSet up Custom Port Forwarding Rules Page Access Control menu Access ControlVPN Enable/Disable NAT and Firewall Advanced SecurityDMZ IP Address Bridge Filters Setup Remote Management10. Multicast pass-through menu Multicast Pass-through11. Static Routing menu Static Routing12. Dynamic Routing RIP menu Dynamic RoutingMultiple Virtual Connections Wireless ManagementPage 13. Tools and utility menu links Tools and Utility Menus14. User Management menu User Management15. Tools System Commands menu System Commands16. Remote Log menu Remote Log17. Tools Update Gateway window Update Gateway18. Tools Ping Test window Ping Test19. Tools Modem Test window Modem Test20. Status display links Status Menus21. Network Statistics window Network Statistics22. Connection Status window Connection Status23. Dhcp Clients window Dhcp Clients24. Modem Status window Modem Status25. Product Information window Product Information26. System Log window System Log27. Opening Help window Help MenuTechnical Specifications CE Class B, FCC Class B Part Physical and EnvironmentalManual IP Address Assignment IP Address SetupUsing the Default IP Address Assigning Network IP AddressesUsing Dhcp IP Setup Example #2Changing the IP Address of the Router IP Addresses IP ConceptsClass Beginning Address Ending Address Subnet MaskClass a 255.0.0.0 Class B 255.255.0.0 Class C 255.255.255.0 IP Class Subnet MaskMicrofilter Installation Microfilters and SplittersMicrofilters Line Splitter Line Splitter Installation