什么是WIFI?

nicholas

WIFI是什么意思啊?

emmaqin

<P>在网上查一下啊</P><P>Wireless Fidelity  无线高保真  Wi-Fi代表了"无线保真"，指具有完全兼容性的802.11标准IEEE802.11b子集，它使用开放的2.4GHz直接序列扩频，最大数据传输速率为11Mbps，也可根据信号强弱把传输率调整为5.5Mbps、2Mbps和1Mbps带宽。无需直线传播传输范围为室外最大<st1:chmetcnv w:st="on" UnitName="米" SourceValue="300" HasSpace="False" Negative="False" NumberType="1" TCSC="0">300米</st1:chmetcnv>，室内有障碍的情况下最大<st1:chmetcnv w:st="on" UnitName="米" SourceValue="100" HasSpace="False" Negative="False" NumberType="1" TCSC="0">100米</st1:chmetcnv>，是现在使用的最多的传输协议。</P><P>802.11<FONT face=宋体>标准和补充。<p></p></FONT></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         802.11 ，1997年，原始标准(2Mbit/s 工作在2.4GHz)。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         <st1:chmetcnv w:st="on" UnitName="a" SourceValue="802.11" HasSpace="False" Negative="False" NumberType="1" TCSC="0">802.11a</st1:chmetcnv>，1999年，物理层补充(54Mbit/s工作在5GHz) 。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         802.11b，1999年，物理层补充(11Mbit/s工作在2.4GHz) 。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         <st1:chmetcnv w:st="on" UnitName="C" SourceValue="802.11" HasSpace="False" Negative="False" NumberType="1" TCSC="0">802.11c</st1:chmetcnv>，符合802.1D的媒体接入控制层(MAC) 桥接(MAC Layer Bridging) 。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         802.11d，根据各国无线电规定做的调整。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         802.11e ，对服务等级(Quality of Service, QS) 的支持。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         <st1:chmetcnv w:st="on" UnitName="F" SourceValue="802.11" HasSpace="False" Negative="False" NumberType="1" TCSC="0">802.11f</st1:chmetcnv>，基站的互连性(Interoperability) 。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         <st1:chmetcnv w:st="on" UnitName="g" SourceValue="802.11" HasSpace="False" Negative="False" NumberType="1" TCSC="0">802.11g</st1:chmetcnv>，物理层补充(54Mbit/s工作在2.4GHz) 。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         802.11h，无线覆盖半径的调整，室内(indoor) 和室外(outdoor) 信道(5GHz频段) 。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         802.11i，安全和鉴权(Authentification)方面的补充。 <p></p></P><P 0cm 0cm 0pt 36pt; TEXT-INDENT: 10pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-list: l0 level1 lfo1; tab-stops: list 36.0pt" align=left>·         802.11n，导入多重输入输出 (MIMO) 技术，基本上是<st1:chmetcnv w:st="on" UnitName="a" SourceValue="802.11" HasSpace="False" Negative="False" NumberType="1" TCSC="0">802.11a</st1:chmetcnv>的延伸版。 <p></p></P><P> </P>[br]<p align=right><font color=red>+1 RD币</font></p>

kongkong08

<P>xuexi!</P>

Atheros531x

就是簡單意義上的wlan吧，我一直這樣認爲的.

qieyong

Short for wireless fidelity and is meant to be used generically when referring of any type of 802.11 network, whether 802.11b, 802.11a, dual-band, etc. The term is promulgated by the Wi-Fi Alliance.
Any products tested and approved as "Wi-Fi Certified" (a registered trademark) by the Wi-Fi Alliance are certified as interoperable with each other, even if they are from different manufacturers. A user with a "Wi-Fi Certified" product can use any brand of access point with any other brand of client hardware that also is certified. Typically, however, any Wi-Fi product using the same radio frequency (for example, 2.4GHz for 802.11b or 11g, 5GHz for 802.11a) will work with any other, even if not "Wi-Fi Certified."

Formerly, the term "Wi-Fi" was used only in place of the 2.4GHz 802.11b standard, in the same way that "Ethernet" is used in place of IEEE 802.3. The Alliance expanded the generic use of the term in an attempt to stop confusion about wireless LAN interoperability.

Also see the Wireless LAN Standards chart in the Quick Reference section of Webopedia.

qieyong

WLAN是Wireless Local-area Network的缩写.即无线局域网. 是计算机网络与无线通信技术相结合的产物.

从专业角度讲，无线局域网利用了无线多址信道的一种有效方法来支持计算机之间的通信，并为通信的移动化、个性化和多媒体应用提供了可能。

通俗地说，无线局域网（Wireless local-area network，WLAN）就是在不采用传统缆线的同时，提供以太网或者令牌网络的功能。

Atheros531x

WLAN现在一个主要的问题是各种wlan产品的互操作性论证，LZ可以自己到网上关注一下这方面的新闻.[em01]

hanns

以下是引用Atheros531x在2006-8-3 15:38:00的发言：
WLAN现在一个主要的问题是各种wlan产品的互操作性论证，LZ可以自己到网上关注一下这方面的新闻.[em01]

其实就是另一种无线上网的接入方式！

voage7

学习学习！[em08]