Chapter 5 - Glossary

The 802.11b spectrum is plagued by saturation from wireless phones, microwave ovens and other emerging wireless technologies, such as Bluetooth. In contrast, 802.11a spectrum is relatively free of interference.

The 802.11a standard gains some of its performance from the higher frequencies at which it operates. The laws of information theory tie frequency, radiated power and distance together in an inverse relationship. Thus, moving up to the 5-GHz spectrum from 2.4 GHz will lead to shorter distances, given the same radiated power and encoding scheme.

Compared with 802.11g: 802.11a is a standard for access points and radio NICs that is ahead of 802.11g in the market by about six months. 802.11a operates in the 5GHz frequency band with twelve separate non-overlapping channels. As a result, you can have up to twelve access points set to different channels in the same area without them interfering with each other. This makes access point channel assignment much easier and significantly increases the throughput the wireless LAN can deliver within a given area. In addition, RF interference is much less likely because of the less-crowded 5 GHz band.

IEEE 802.11b (11Mbits/sec)

In 1997, the Institute of Electrical and Electronics Engineers (IEEE) adopted the 802.11 standard for wireless devices operating in the 2.4 GHz frequency band. This standard includes provisions for three radio technologies: direct sequence spread spectrum, frequency hopping spread spectrum, and infrared. Devices that comply with the 802.11 standard operate at a data rate of either 1 or 2 Mbps.

In 1999, the IEEE created the 802.11b standard. 802.11b is essentially identical to the 802.11 standard except 802.11b provides for data rates of up to 11 Mbps for direct sequence spread spectrum devices. Under 802.11b, direct sequence devices can operate at 11 Mbps, 5.5 Mbps, 2 Mbps, or 1 Mbps. This provides interoperability with existing 802.11 direct sequence devices that operate only at 2 Mbps.

Direct sequence spread spectrum devices spread a radio signal over a range of frequencies. The IEEE 802.11b specification allocates the 2.4 GHz frequency band into 14 overlapping operating Channels. Each Channel corresponds to a different set of frequencies.

IEEE 802.11g

802.11g is a new extension to 802.11b (used in majority of wireless LANs today) that broadens 802.11b's data rates to 54 Mbps within the 2.4 GHz band using OFDM (orthogonal frequency division multiplexing) technology. 802.11g allows backward compatibility with 802.11b devices but only at 11 Mbps or lower, depending on the range and presence of obstructions.

Infrastructure

A wireless network centered about an access point. In this environment, the access point not only provides communication with the wired network but also mediates wireless network traffic in the immediate neighborhood.

Chapter 5 Glossary

ASUS WLAN Adapter

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Asus WL-160W user manual Ieee 802.11b 11Mbits/sec, Ieee 802.11g, Infrastructure
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WL-160W specifications

The Asus WL-160W is a versatile and compact wireless USB adapter that caters to users seeking a reliable solution for connecting to Wi-Fi networks. Designed to offer high-speed internet access, this device supports the popular IEEE 802.11g standard, delivering data transfer rates of up to 54 Mbps. With its backward compatibility to the IEEE 802.11b standard, the WL-160W ensures seamless connectivity to older networks as well.

One of the standout features of the Asus WL-160W is its easy installation process. The adapter comes equipped with an intuitive setup wizard that simplifies the configuration, enabling users to connect to their wireless networks swiftly. With Plug and Play compatibility on most modern operating systems, users can experience hassle-free connectivity right out of the box.

The WL-160W boasts a compact and portable design, making it an excellent choice for users who require mobility, whether at home or on the go. Its lightweight nature allows for easy transport, enabling users to carry it in a laptop bag or pocket. The device also features a convenient USB interface, negating the need for an external power supply.

Security is a key consideration in wireless networking, and the Asus WL-160W does not disappoint. The adapter incorporates advanced encryption protocols, including WEP, WPA, and WPA2, ensuring that user data remains protected against unauthorized access. This level of security is essential in maintaining privacy and safeguarding sensitive information when using public networks.

Another notable characteristic of the WL-160W is its antenna design. The device utilizes a built-in antenna that enhances signal stability and range. This design helps users maintain a robust connection even at significant distances from the router, reducing the likelihood of drops in connectivity during use.

The Asus WL-160W also supports wireless roaming capabilities, allowing users to move freely within the coverage area without losing connection. This feature is particularly beneficial in larger spaces, where users may need to switch locations frequently.

Overall, the Asus WL-160W is a well-rounded wireless USB adapter that combines functionality with ease of use. Its solid performance, security features, and portability make it a dependable choice for anyone looking to enhance their wireless connectivity experience.
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