N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 7 - LAN, WAN, VPN, WLAN, MAN, FDDI and Optical MANS                                                      Slide 25 of 45 _________________                                                                                  __________

                                                  Wireless LAN Standards

                                                802.11

                                                802.11a

                                                802.11b

                                                802.11g

_________________                                                                                  __________

WLAN products transmit and receive information using radio waves. Multiple, simultaneous transmissions can take place without interference if the radio waves are transmitted on different frequencies. The radio receiver, to extract information, tunes in on one channel while rejecting all other radio signals on other channels. WLANs have evolved for high speed data transmission. IEEE has developed standards (Physical Layer and MAC Layer) across 802.11a, b and g.

802.11 - 1, 2 M bps

802.11a - 54 M bps

802.11b - 11 M bps

802.11g - 54 M bps (extension of 802.11b)