新的無線局域網(wǎng)標(biāo)準(zhǔn)(二)

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What CCK does is apply sophisticated mathematical formulas to the DSSS codes, a permitting the code to represent a greater volume of informitter is now able to send multiple bits of information with each DSSS code, enough to make possible the 11M bit /sec in the original standard .
    The 802.11b standard benefits users by delivering wireless ethernet speeds of 11M bit/sec that can reliably support everyday business applications, e-mail, internet and server network access.
    With support from the new wireless ethernet from the new wireless ethernet compatibility alliance, founded by 3com, lucent, nokia and several other companies in the wireless LAN business, the new standard will also promise certified interoperability across multivendor platforms.
    Finally, the 802.11b standard serves as a clamoring for a simplified wireless LAN landscpape.
    Vendors can now focus on a single, high-speed standard, and users can cut through the clutter of wireless options by fovusing on a standard that delivers multibvendor interoperability and the performance to meet their application needs.
    有了便攜式和無線局域網(wǎng),用戶在離開其辦公桌的時(shí)候,不管是在會(huì)議室、公共區(qū)域還是在遠(yuǎn)處辦公室,都能享有更高的生產(chǎn)效率。
    然而,時(shí)至今日,無線局域網(wǎng)對(duì)多數(shù)企業(yè)應(yīng)用來說還是太慢。依據(jù)IEEE802.11標(biāo)準(zhǔn),他們運(yùn)行速度為1兆至2兆位/秒。
    現(xiàn)在對(duì)此標(biāo)準(zhǔn)的一個(gè)新的更高速擴(kuò)展,能讓無線網(wǎng)支持高達(dá)11兆位/秒的數(shù)據(jù)速率。
    最初的802.11標(biāo)準(zhǔn)是在1997年提出的,通過定義能與常規(guī)的上層企業(yè)協(xié)議組一起工作的低級(jí)協(xié)議體系結(jié)構(gòu),把無線行業(yè)團(tuán)結(jié)起來了。802.11也保持了與三種最流行的無線電傳輸方式(直接順序擴(kuò)頻、跳頻擴(kuò)頻和紅外線)的兼容性。