Netgear fwag114 참조 매뉴얼

Wireless Networking Basics

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This chapter provides an overview of Wireless networking.

The FWAG114 wireless firewall conforms to the Institute of Electrical and Electronics Engineers 
(IEEE) 802.11b standard for wireless LANs (WLANs) and a product update will bring the 
FWAG114 into conformance to the 802.11g standard when it is ratified. On an 802.11b or g 
wireless link, data is encoded using direct-sequence spread-spectrum (DSSS) technology and is 
transmitted in the unlicensed radio spectrum at 2.5GHz. The maximum data rate for the 802.11b 
wireless link is 11 Mbps, but it will automatically back down from 11 Mbps to 5.5, 2, and 1 Mbps 
when the radio signal is weak or when interference is detected. The 802.11g auto rate sensing rates 
are 1, 2, 5.5, 6, 9, 12, 18, 24, 36, 48, and 54 Mbps. Likewise, the 802.11a wireless link offers a 
maximum data rate of 54 Mbps, but will automatically back down to rates 48, 36, 24, 18, 12, 9, 
and 6 Mbps.

The 802.11 standard is also called Wireless Ethernet or Wi-Fi by the Wireless Ethernet 
Compatibility Alliance (WECA, see 

), an industry standard group promoting 

interoperability among 802.11 devices. The 802.11 standard offers two methods for configuring a 
wireless network - ad hoc and infrastructure.