The Committee is a committee that is trying 802.11e QoS capabilities provide wireless Ethernet netw

Wireless networks are based on the design and implementation. In June 1997, the Association mc lane of Electrical and Electronics Engineers (IEEE) mc lane standard for wireless LAN standard IEEE 802.11-1997 as first published. This standard was revised in 1999 and updated edition was published under the title IEEE 802.11-1999. IEEE 802.11 wireless local area network or the current standard known as ISO / IEC 8802-11: 1999, by the International Standardization Organization (ISO) and America's National Standards Institute (ANSI) has been accepted. mc lane Completed in the year 1997, the formation and the emergence of standards-based wireless local area networks followed. Standard 1997, 2Mbps bandwidth defines the characteristic of conditions and environments with disturbance (noise), the bandwidth can be reduced to the amount of 1Mbps. The bandwidth of the DSSS modulation or modulation method. The standard bandwidth of 1 Mbps using FHSS modulation is achieved in an environment free from disturbance (noise) bandwidth of 2 Mbps can also be used. Both modulation method in the range of 2.4 GHz radio band act. One of the interesting points of this standard uses DSSS and FHSS radio media modulation infrared addition mc lane to the transmission medium. However, mc lane the restrictions on the use of these media ao relatively limited and rare. 802.11 working group is divided into several groups. Figures 1-1 and 1-2 working groups involved in the standardization process of the show. Some of the most important sub-groups as follows:
- 802.11D: Additional Regulatory Domains - 802.11E: Quality of Service (QoS) - 802.11F: Inter-Access Point Protocol (IAPP) - 802.11G: mc lane Higher Data Rates at 2.4 GHz - 802.11H: Dynamic Channel Selection and Transmission Power Control - 802.11i: Authentication and Security
The Committee is a committee that is trying 802.11e QoS capabilities provide wireless Ethernet network environments. Note that the activities of the group include all species of 802.11 a, b, and g is the. The Committee considers that the relationship between service quality wired or wireless Ethernet QoS bring into the world.
802.11g Committee is a committee that developed also known as 802.11. The Committee mc lane intends to increase the rate of data transmission in the ISM frequency band. ISM frequency band or frequency band, industrial, research, and medicine, is an unlicensed frequency band. The use of this frequency band in the range 2400 MHz to 2483.5 MHz is, in accordance with FCC regulations does not licensed in the use of radiation. 802.11g standard has not been finalized and most important reason mc lane is intense competition between modulation techniques. The members of the committee and chip manufacturers have agreed to use the OFDM multiplexing technique but PBCC method can also be considered as an alternative and rival.
The committee 802.11i and 802.11x activity initially focused on systems based on 802.11b. The two committees are responsible for preparing the new security protocols. Primary standard called WEP uses an algorithm in which the structure of the encryption key length of 128 bits is 40. WEP encryption is clearly a method that uses RC4 algorithm to encrypt frames. The activities of this committee is to improve the security of wireless LANs.
Wireless environments have characteristics that are unique compared to wired LANs gives a special place in these networks. Specifically, the physical characteristics of a wireless mc lane local area network distance mc lane limitations, error rates increase and decrease the reliability of the medium, dynamic changing topology, interference, and the lack of a reliable and stable relationship with a wired connection. These limitations, the standard for wireless local area networks can make is that your assumptions are based on a local connection and establish a short range. Broad geographic coverage through a small wireless LAN connection is established when an element mc lane is building an extensive network. Wireless mobile workstations as well as other important features for wireless mc lane LANs. In fact, if a wireless local area network workstations are capable of operating in an acceptable range and mobility are among the wireless networks, wireless local area network proper use of the justification will not develop.
On the other hand, in order to maintain consistency and the ability to adapt and work with other standards, media access layer (MAC) layers above the 802.11 standard should see similar to a standard LAN-based 802 act. Because the MAC layer standard mobile workstations have the transparent cover so that the upper layers of the standard view Syarbvdn not feel it. This causes the MAC layer to take the standard functions usually performed by higher mc lane layers of the network. In fact, the standard physical and data link layers of the OSI reference model adds a new and specifically new physical mc lane layer of radio frequencies as Rsanhantqal benefit. Shkl1-4, place the two layers of the OSI reference model, along with other networking protocols show. As can be seen in this figure are the two layers of the upper layers of clear vision.
For more information on the IEEE 802.11 mc lane working group can see http://www.ieee802.org/11 address. In addition,