Asus WL-160W 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 Adapter

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Contents Wireless Local Area Network Adapter WL-160W Copyright Information Technical support ASUSTeK Computer INCAsus Computer International America Asus Computer GmbH Germany & AustriaTable of Contents Features Package contentsSystem Requirements Installing the Wlan utilities and driverACT LED Reading the Wlan status indicatorsOne Touch Wizard Installation Chapter Configuring with the Wlan utility InfrastructureConfiguring with the Wlan utility Ad Hoc Starting the Control Center Using the Control CenterWireless Status Icons on the taskbar Asus Wlan Control CenterTaskbar icon Right-click menu Taskbar Icon Launch Wireless SettingsWireless Radio On Click to turn Wireless Radio Off Click to turnStatus Status Starting Wireless SettingsAssociation State Buttons Status Connection Status Ping Status IP ConfigButton Channel Config BasicNetwork Type Network Name SsidFragmentation Threshold Config AdvancedOthers RTS ThresholdNetwork Authentication Config EncryptionKey Format Wireless Network KeyWireless Network Key WEP Data encryption64/128bits versus 40/104bits Select one as your Default KeySurvey Site Survey Config AuthenticationAbout Version Info Link State Exit Wireless SettingsOnly use Windows wireless function Windows XP Wireless OptionsSoftware Reference Cannot connect to any access points Verify if the Wlan Adapter is installed correctly TCP/IP protocol did not bind to the Wlan PC Adapter Bad link quality or bad signal strengthBasic Rate Set Access Point APBasic Service Area BSS Ad HocDNS Server Address Domain Name System Default KeyDhcp Dynamic Host Configuration Protocol Device NameEssid Extended Service Set Identifier Extended Service Set ESSEncryption Ieee EthernetFirewall GatewayIeee 802.11g Ieee 802.11b 11Mbits/secInfrastructure IP Address ISP Internet Service ProviderMAC Address Media Access Control IP Internet ProtocolPPP Point-to-Point Protocol Ssid Service Set IdentifierPacket Pass PhraseTCP Transmission Control Protocol Weca Wireless Ethernet Compatibility AllianceWPA Wi-Fi Protected Access Wlan Wireless Local Area NetworkFCC Warning Statement Safety InformationProhibition of Co-location CE Mark Warning Declaration of Conformity for R&TTE directive 1999/5/EC
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