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IEEE 802.11b-1999
 
 
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IEEE 802.11b-1999 or 802.11b, is an amendment to the IEEE 802.11
IEEE 802.11

IEEE 802.11 is a set of standards carrying out Wireless LAN computer communication in the 2.4, 3.6 and 5 GHz frequency bands. They are implemented by the Institute of Electrical and Electronics Engineers LAN/MAN Standards Committee ....
 specification that extended throughput up to 11 Mbit/s using the same 2.4 GHz
GHZ

GHZ or GHz may refer to:# Hertz .# Greenberger-Horne-Zeilinger state - a quantum entanglement of three particles.# Habitable zone - the region of a galaxy that is favorable to the formation of life....
 band. This specification under the marketing name of Wi-Fi
Wi-Fi

Wi-Fi is a trademark of the Wi-Fi Alliance, founded in 1999 as Wireless Internet Compatibility Alliance , comprising more than 300 companies, whose products are certified by the Wi-Fi Alliance, based on the IEEE 802.11 standards ....
 has been implemented all over the world. The amendment has been incorporated into the published IEEE 802.11-2007 standard.

802.11 is a set of IEEE standards that govern wireless networking transmission methods.






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IEEE 802.11b-1999 or 802.11b, is an amendment to the IEEE 802.11
IEEE 802.11

IEEE 802.11 is a set of standards carrying out Wireless LAN computer communication in the 2.4, 3.6 and 5 GHz frequency bands. They are implemented by the Institute of Electrical and Electronics Engineers LAN/MAN Standards Committee ....
 specification that extended throughput up to 11 Mbit/s using the same 2.4 GHz
GHZ

GHZ or GHz may refer to:# Hertz .# Greenberger-Horne-Zeilinger state - a quantum entanglement of three particles.# Habitable zone - the region of a galaxy that is favorable to the formation of life....
 band. This specification under the marketing name of Wi-Fi
Wi-Fi

Wi-Fi is a trademark of the Wi-Fi Alliance, founded in 1999 as Wireless Internet Compatibility Alliance , comprising more than 300 companies, whose products are certified by the Wi-Fi Alliance, based on the IEEE 802.11 standards ....
 has been implemented all over the world. The amendment has been incorporated into the published IEEE 802.11-2007 standard.

802.11 is a set of IEEE standards that govern wireless networking transmission methods. They are commonly used today in their 802.11a, 802.11b, and 802.11g versions to provide wireless connectivity in the home, office and some commercial establishments.

Description

802.11b has a maximum raw data rate of 11 Mbit/s and uses the same CSMA/CA
Carrier sense multiple access with collision avoidance

In computer networking, CSMA/CA belongs to a class of protocols called multiple access methods. CSMA/CA stands for: Carrier Sense Multiple Access With Collision Avoidance....
 media access method defined in the original standard. Due to the CSMA/CA protocol overhead, in practice the maximum 802.11b throughput that an application can achieve is about 5.9 Mbit/s using TCP
Transmission Control Protocol

The Transmission Control Protocol is one of the core protocols of the Internet Protocol Suite. TCP is so central that the entire suite is often referred to as "TCP/IP"....
 and 7.1 Mbit/s using UDP
User Datagram Protocol

The User Datagram Protocol is one of the core members of the Internet Protocol Suite, the set of network protocols used for the Internet. With UDP, computer applications can send messages, sometimes known as datagram, to other hosts on an Internet Protocol network without requiring prior communications to set up special transmission cha...
.

802.11b products appeared on the market in early 2000, since 802.11b is a direct extension of the DSSS
Direct-sequence spread spectrum

In telecommunications, direct-sequence spread spectrum is a modulation technique. As with other spread spectrum technologies, the transmitted signal takes up more Bandwidth than the information signal that is being modulated....
 (Direct-sequence spread spectrum) modulation technique defined in the original standard. Technically, the 802.11b standard uses Complementary code keying
Complementary code keying

Complementary Code Keying is a modulation scheme used with wireless networks that employ the IEEE 802.11b specification. In 1999, CCK was adopted to replace the Barker code in wireless digital networks....
 (CCK) as its modulation technique. The dramatic increase in throughput of 802.11b (compared to the original standard) along with simultaneous substantial price reductions led to the rapid acceptance of 802.11b as the definitive wireless LAN technology.

802.11b devices suffer interference from other products operating in the 2.4 GHz band. Devices operating in the 2.4 GHz range include: microwave ovens, Bluetooth devices, baby monitors and cordless telephones. Interference issues and user density problems within the 2.4 GHz band have become a major concern and frustration for users.

Range

802.11b is used in a point-to-multipoint
Point-to-multipoint

For general information for point-to-multipoint communication, refer to Link #Point-to-multipoint.Point-to-multipoint communication is a term that is used in the telecommunications field which refers to communication which is accomplished via a specific and distinct type of multipoint connection, providing multiple paths from a single locat...
 configuration, wherein an access point
Access Point

Access Point can refer to:*Access Point , a location on Anvers Island, Antarctica*Wireless access point, a wireless networking device...
 communicates via an omni-directional antenna with one or more nomadic or mobile clients that are located in a coverage area around the access point. Typical indoor range is 30 m (100 ft) at 11 Mbit/s and 90 m (300 ft) at 1 Mbit/s. The overall bandwidth is dynamically demand shared across all the users on a channel. With high-gain external antennas, the protocol can also be used in fixed point-to-point arrangements, typically at ranges up to 8 kilometers (5 miles) although some report success at ranges up to 80–120 km (50–75 miles) where line of sight
Line-of-sight propagation

Line-of-sight propagation refers to electro-magnetic radiation including light emissions traveling in a straight line. The rays or waves are diffracted, refracted, reflected, or absorbed by atmosphere and obstructions with material and generally cannot travel over the horizon or behind obstacles....
 can be established. This is usually done in place of costly leased line
Leased line

A leased line is a Symmetric#Symmetry_in_telecommunications telecommunications line connecting two locations. It is sometimes known as a 'Private Circuit' or 'Data Line' in the UK....
s or very cumbersome microwave
Microwave

Microwaves are electromagnetic radiation with wavelengths ranging from 1 mm to 1 m, or frequency between 0.3 hertz and 300 GHz....
 communications equipment. Designers of such installations who wish to remain within the law must however be careful about legal limitations on effective radiated power
Effective radiated power

In radio telecommunications, effective radiated power or equivalent radiated power is a standardized theoretical measurement of Radio frequency energy using the non-International System of Units unit Decibel, and is determined by subtracting system losses and adding system gains....
.

802.11b cards can operate at 11 Mbit/s, but will scale back to 5.5, then 2, then 1 Mbit/s (also known as Adaptive Rate Selection), if signal quality becomes an issue.

Comparison chart


See also

  • IEEE 802.11
    IEEE 802.11

    IEEE 802.11 is a set of standards carrying out Wireless LAN computer communication in the 2.4, 3.6 and 5 GHz frequency bands. They are implemented by the Institute of Electrical and Electronics Engineers LAN/MAN Standards Committee ....
  • IEEE 802.11g-2003
    IEEE 802.11g-2003

    IEEE 802.11g-2003 or 802.11g, is an amendment to the IEEE 802.11 specification that extended throughput to up to 54 Mbit/s using the same 2.4 GHz band as 802.11b....
  • Wi-Fi
    Wi-Fi

    Wi-Fi is a trademark of the Wi-Fi Alliance, founded in 1999 as Wireless Internet Compatibility Alliance , comprising more than 300 companies, whose products are certified by the Wi-Fi Alliance, based on the IEEE 802.11 standards ....
  • List of WLAN channels
    List of WLAN channels

    The List of WLAN channels is the legally allowed IEEE 802.11 or more commonly Wi-Fi Wireless LAN channels.The 802.11 workgroup currently documents use in three distinct frequency ranges, 2.4 GHz, 3.6 GHz and 4.9/5.0 GHz band ....