Z-World RCM3000, Руководство пользователя

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User’s Manual 19
3. W
I
-F
I
O
VERVIEW
Wi-Fi, a popular name for 802.11b, is one of the wireless schemes available in the 802.11
suite conforming to IEEE standards. 802.11b describes the media access and link layer
control for a 2.4 GHz implementation, which can communicate at up to 11 Mbits/s. Other
standards describe a faster implementation (54 Mbits/s) in the 2.4 GHz band (802.11g)
and a 54 Mbits/s implementation in the 5.6 GHz band (802.11a). The adoption of 802.11
has been fast because it’s easy to use and the performance is comparable to wire-based
LANs.
Wi-Fi (802.11b) is one of the most common and cost-effective implementations currently
available. This is the implementation that is used with Z-World’s Wi-Fi Add-On Kits. A
variety of Wi-Fi hardware exists, from wireless access points (WAPs), various Wi-Fi
access devices with PCI, PCMCIA, CompactFlash, USB and SDIO interfaces, and Wi-Fi
devices such as Web-based cameras and print servers.
802.11b can operate in one of two modes—a managed-access mode (a Basic Service Set
or BSS, where one access point is connected to a wireless network), called an infrastruc-
ture mode, or an unmanaged mode (a peer-to-peer mode or an Independent Basic Service
Set or IBSS), called the ad-hoc mode. The 802.11 standard describes the details of how
devices access each other in either of these modes.
Equipment configured for 802.11g may also be used with 802.11b.