Tp-Link TL-WN620G Инструкция по эксплуатации онлайн [33/33] 3929

TL-WN620G 108M Wireless USB Adapter User Guide

¾ FHSS (Frequency Hopping Spread Spectrum) - FHSS continuously changes (hops) the

carrier frequency of a conventional carrier several times per second according to a

pseudo-random set of channels. Because a fixed frequency is not used, and only the

transmitter and receiver know the hop patterns, interception of FHSS is extremely difficult.

¾ Infrastructure Network - An infrastructure network is a group of computers or other devices,

each with a wireless adapter, connected as an 802.11 wireless LAN. In infrastructure mode,

the wireless devices communicate with each other and to a wired network by first going

through an access point. An infrastructure wireless network connected to a wired network is

referred to as a Basic Service Set (BSS). A set of two or more BSS in a single network is

referred to as an Extended Service Set (ESS). Infrastructure mode is useful at a corporation

scale, or when it is necessary to connect the wired and wireless networks.

¾ 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).

¾ SSID - A Service Set Identification is a thirty-two character (maximum) alphanumeric key

identifying a wireless local area network. For the wireless devices in a network to

communicate with each other, all devices must be configured with the same SSID. This is

typically the configuration parameter for a wireless PC card. It corresponds to the ESSID in

the wireless Access Point and to the wireless network name.

¾ WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64-bit or 128-bit or

152-bit shared key algorithm, as described in the IEEE 802.11 standard.

¾ Wi-Fi - A trade name for the 802.11b wireless networking standard, given by the Wireless

Ethernet Compatibility Alliance (WECA, see http://www.wi-fi.net), an industry standards

group promoting interoperability among 802.11b devices.

¾ WLAN (Wireless Local Area Network) - A group of computers and associated devices

communicate with each other wirelessly, which network serving users are limited in a local

area.

¾ WPA (Wi-Fi Protected Access) - A wireless security protocol use TKIP (Temporal Key

Integrity Protocol) encryption, which can be used in conjunction with a RADIUS server.