Linksys WRTU54G-TM manual What is Spread Spectrum?, What is WEP?, What is a MAC Address?

Page 62

Wireless-G Broadband Router with 2 Phone Ports

What is Spread Spectrum?

Spread Spectrum technology is a wideband radio frequency technique developed by the military for use in reliable, secure, mission-critical communications systems. It is designed to trade off bandwidth efficiency for reliability, integrity, and security. In other words, more bandwidth is consumed than in the case of narrowband transmission, but the trade-off produces a signal that is, in effect, louder and thus easier to detect, provided that the receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is not tuned to the right frequency, a spread-spectrum signal looks like background noise. There are two main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).

What is DSSS? What is FHSS? And what are their differences?

Frequency-Hopping Spread-Spectrum (FHSS) uses a narrowband carrier that changes frequency in a pattern that is known to both transmitter and receiver. Properly synchronized, the net effect is to maintain a single logical channel. To an unintended receiver, FHSS appears to be short-duration impulse noise. Direct-Sequence Spread- Spectrum (DSSS) generates a redundant bit pattern for each bit to be transmitted. This bit pattern is called a chip (or chipping code). The longer the chip, the greater the probability that the original data can be recovered. Even if one or more bits in the chip are damaged during transmission, statistical techniques embedded in the radio can recover the original data without the need for retransmission. To an unintended receiver, DSSS appears as low power wideband noise and is rejected (ignored) by most narrowband receivers.

What is WEP?

WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 64-bit or 128-bit shared key algorithm, as described in the IEEE 802.11 standard.

What is a MAC Address?

The Media Access Control (MAC) address is a unique number assigned by the manufacturer to any Ethernet networking device, such as a network adapter, that allows the network to identify it at the hardware level. For all practical purposes, this number is usually permanent. Unlike IP addresses, which can change every time a computer logs onto the network, the MAC address of a device stays the same, making it a valuable identifier for the network.

How do I reset the Router?

Press the Reset button on the back panel for about five seconds. This will reset the Router to its default settings.

How do I resolve issues with signal loss?

There is no way to know the exact range of your wireless network without testing. Every obstacle placed between the Router and a wireless PC will create signal loss. Lead glass, metal, concrete floors, water and walls will inhibit the signal and reduce range. Start with the Router and your wireless PC in the same room and move it away in small increments to determine the maximum range in your environment. You may also try using different channels, as this may eliminate interference affecting only one channel.

Appendix A: Troubleshooting

55

Frequently Asked Questions

Page 61 Page 63
Image 62
Page 61 Page 63
Contents 802 GHz .11g Wireless- G Word definition How to Use This User GuideCopyright and Trademarks Table of Contents Appendix C Upgrading Firmware Appendix D Windows Help Appendix a TroubleshootingAppendix B Wireless Security Ethernet AdapterList of Figures Router’s Back Panel17 Wireless Tab Basic Wireless Settings 51 Status Tab Voice Error List Introduction WelcomeWhat’s in this User Guide? Wireless-G Broadband Router with 2 Phone Ports Ssid service set identifier your wireless network’s name Planning Your Wireless NetworkAd-Hoc versus Infrastructure Mode Network TopologyPlanning Your Wireless Network Network Layout Getting to Know the Wireless-G Broadband Router Back PanelFront Panel EthernetHardware Installation for Connection to Your Broadband Modem OverviewConnecting Your Network Devices Hardware Installation for Connection to An Existing Router Multiple PCsConnecting the Power Placement Options SIM Card Installation Direction HolderPassword Screen Setup Tab Basic Setup Internet SetupPPPoE Connection Type Optional Settings Router IP Setup Tab Ddns Ddns ServiceSetup Tab MAC Address Clone 14 Setup Tab MAC Address CloneSetup Tab Advanced Routing 15 Setup Tab Advanced Routing RouterWireless Tab Basic Wireless Settings Wireless Tab Wireless Security 18 Wireless Tab Wireless Security WPA Personal21 Wireless Tab Wireless Security WPA2 Enterprise 22 Wireless Tab Wireless Security Radius Wireless Tab Wireless MAC Filter 24 Wireless Tab Wireless MAC FilterWireless Tab Advanced Wireless Settings SettingWireless-G Broadband Router with 2 Phone Ports Security Tab Firewall Security Tab VPN PassthroughAccess Restrictions Tab Internet Access To create an Internet Access policyClick the Modify button Applications and Gaming Tab Port Range Forward 33 Applications and Gaming Tab Port Range ForwardApplications & Gaming Tab Port Triggering Port TriggeringApplications and Gaming Tab QoS Wired QoSApplications and Gaming Tab DMZ Wireless QoS Ethernet Port PriorityAdministration Tab Management Administration Tab LogAdministration Tab Diagnostics 39 Administration Tab DiagnosticsAdministration Tab Config Management Administration Tab Factory DefaultsAdministration Tab Firmware Upgrade Status Tab Router 45 Status Tab RouterStatus Tab Local Network 46 Status Tab Local NetworkStatus Tab Wireless 48 Status Tab WirelessStatus Tab Voice 49 Status Tab VoiceNeed to set a static IP address on a PC Appendix a TroubleshootingCommon Problems and Solutions Wireless-G Broadband Router with 2 Phone Ports Open a command prompt. For Windows 2000 and XP Application Start and End Protocol IP Address Enabled TCPCan’t get the Internet game, server, or application to work Wireless-G Broadband Router with 2 Phone Ports To start over, I need to set the Router to factory default Need to upgrade the firmwareIs IPSec Pass-Through supported by the Router? Frequently Asked QuestionsWhere is the Router installed on the network? Does the Router support IPX or AppleTalk?How can I block corrupted FTP downloads? If all else fails in the installation, what can I do?Does the Router support ICQ send file? How many ports can be simultaneously forwarded? What is DMZ Hosting?Is the Router cross-platform compatible? What is the Ieee 802.11b standard? What are the advanced features of the Router?What is the Ieee 802.11g standard? What Ieee 802.11g features are supported?What is roaming? What is ad-hoc mode?What is infrastructure mode? What is ISM band?What is WEP? What is Spread Spectrum?What is DSSS? What is FHSS? And what are their differences? What is a MAC Address?Have excellent signal strength, but I cannot see my network How many channels/frequencies are available with the Router?Security Threats Facing Wireless Networks Appendix B Wireless SecuritySecurity Precautions Appendix B Wireless Security Wireless-G Broadband Router with 2 Phone Ports Figure C-1 Upgrade Firmware Appendix C Upgrading FirmwareNetwork Neighborhood/My Network Places Appendix D Windows HelpShared Resources Windows 2000 or XP Instructions Windows Vista InstructionsFor the Router’s Web-based Utility Figure E-3 MAC Address CloneAppendix F Glossary Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wi-Fi Protected Access2 WPA2 Appendix G SpecificationsWireless Security ModelCertifications Appendix H Warranty Information Limited WarrantyAppendix I Regulatory Information Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless-G Broadband Router with 2 Phone Ports Wireless Disclaimer Avis de non-responsabilité concernant les appareils sans filSchedule 1 Linksys Software License Agreement Appendix J Software License AgreementSoftware in Linksys Products Software LicensesWireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband Schedule PreambleWireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband No Warranty GNU Lesser General Public License Wireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband Wireless-G Router for 3G/UMTS Broadband OpenSSL License Original SSLeay License END of Schedule Appendix K Contact Information
Top Page Image Contents