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  • WLAN Technologies

    LAN Technologies
    802.11 Wireless LAN
    Provides network connectivity over wireless media
    An Access Point (AP) is installed to act as Bridge between Wireless and Wired Network
    The AP is connected to wired network and is equipped with antennae to provide wireless connectivity
    Range ( Distance between Access Point and WLAN client) depends on structural hindrances and RF gain of the antenna at the Access Point
    To service larger areas, multiple APs may be installed with a 20-30% overlap
    A client is always associated with one AP and when the client moves closer to another AP, it associates with the new AP (Hand-Off)
    Three flavors:
    802.11b
    802.11a
    802.11g

    Multiple Access with Collision Avoidance (MACA)
    Before every data transmission

    Sender sends a Request to Send (RTS) frame containing the length of the transmission
    Receiver respond with a Clear to Send (CTS) frame
    Sender sends data
    Receiver sends an ACK; now another sender can send data
    When sender doesn’t get a CTS back, it assumes collision



    WLAN : 802.11b

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