Asus WL-169gE Encryption, Extended Service Set ESS, Essid Extended Service Set Identifier

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Chapter 5 - Glossary

Direct-sequence systems communicate by continuously transmitting a redundant pattern of bits called a chipping sequence. Each bit of transmitted data is mapped into chips and rearranged into a pseudorandom spreading code to form the chipping sequence. The chipping sequence is combined with a transmitted data stream to produce the output signal.

Wireless mobile clients receiving a direct-sequence transmission use the spreading code to map the chips within the chipping sequence back into bits to recreate the original data transmitted by the wireless device. Intercepting and decoding a direct- sequence transmission requires a predefined algorithm to associate the spreading code used by the transmitting wireless device to the receiving wireless mobile client.

This algorithm is established by IEEE 802.11b specifications. The bit redundancy within the chipping sequence enables the receiving wireless mobile client to recreate the original data pattern, even if bits in the chipping sequence are corrupted by interference. The ratio of chips per bit is called the spreading ratio. A high spreading ratio increases the resistance of the signal to interference. A low spreading ratio increases the bandwidth available to the user. The wireless device uses a constant chip rate of 11Mchips/s for all data rates, but uses different modulation schemes to encode more bits per chip at the higher data rates. The wireless device is capable of an 11 Mbps data transmission rate, but the coverage area is less than a 1 or 2 Mbps wireless device since coverage area decreases as bandwidth increases.

Encryption

This provides wireless data transmissions with a level of security. This option allows you to specify a 64-bit or a 128-bit WEP key. A 64-bit encryption contains 10 hexadecimal digits or 5 ASCII characters. A 128-bit encryption contains 26 hexadecimal digits or 13 ASCII characters.

64-bit and 40-bit WEP keys use the same encryption method and can interoperate on wireless networks. This lower level of WEP encryption uses a 40-bit (10 hexadecimal digits assigned by the user) secret key and a 24-bit Initialization Vector assigned by the device. 104-bit and 128-bit WEP keys use the same encryption method.

All wireless clients in a network must have identical WEP keys with the access point to establish connection. Keep a record of the WEP encryption keys.

Extended Service Set (ESS)

A set of one or more interconnected basic service set (BSSs) and integrated local area networks (LANs) can be configured as an Extended Service Set.

ESSID (Extended Service Set Identifier)

You must have the same ESSID entered into the gateway and each of its wireless clients. The ESSID is a unique identifier for your wireless network.

Chapter 5 Glossary

ASUS WLAN Card

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Contents For 802.11g & 802.11b Wireless Networks Copyright Information Asus Computer International America ASUSTeK Computer INCAsus Computer GmbH Germany & Austria Technical supportTable of Contents Overview IntroductionFeatures Package contentsInstallation Installing the Wlan utilities and driverSystem Requirements Installation process takes several seconds Reading the Wlan status indicatorsOne Touch Wizard Installation ChapterConfiguring with the Wlan utility Infrastructure Configuring with the Wlan utility Ad Hoc Wireless Status Icons on the taskbar Using the Control CenterSoftware Reference Asus Wlan Control CenterTaskbar Icon Launch Wireless Settings Taskbar Icon Right-click MenuTaskbar Icon Left-click Menu Starting Wireless Settings Asus Wireless Settings UtilityStatus Status Association StateCurrent Channel MAC addressCurrent Data Rate Radio StateStatus Connection Status IP Config Status PingButton Network Type Config BasicNetwork Name Ssid ChannelData Rate Config AdvancedOthers RTS Threshold54g Mode Preamble ModePower Output Frame BurstingConfig Encryption Network AuthenticationWireless Network Key WEP Wireless Network KeyData encryption Key Format64/128bits versus 40/104bits Select one as your Default KeySurvey Site Survey Config AuthenticationAbout Version Info Link State Exit Wireless SettingsWindows XP Wireless Options Only use Windows wireless functionConfiguring with Windows Wireless Zero Configuration service Software Reference Troubleshooting Verify if the Wlan Card is installed correctlyCannot connect to any Access Points Bad link quality or bad signal strength Cannot connect to a Station Wlan CardTCP/IP protocol did not bind to the Wlan PC Card Glossary Device Name Default KeyDhcp Dynamic Host Configuration Protocol DNS Server Address Domain Name SystemExtended Service Set ESS Essid Extended Service Set IdentifierEncryption Firewall EthernetGateway IeeeIeee 802.11b 11Mbits/sec Ieee 802.11gInfrastructure MAC Address Media Access Control ISP Internet Service ProviderIP Internet Protocol IP AddressPacket Ssid Service Set IdentifierPass Phrase PPP Point-to-Point ProtocolWPA Wi-Fi Protected Access Weca Wireless Ethernet Compatibility AllianceWlan Wireless Local Area Network TCP Transmission Control ProtocolAppendix Safety InformationFCC Warning Statement Prohibition of Co-locationCE Mark Warning Declaration of Conformity for R&TTE directive 1999/5/EC
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