Microsoft Word wlan security Assessment Countermeasures Final Draft Modified[1]



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2.2.0 INFRARED (IR) LANs
There are three types of infrared transmission directed beam, ominidirectional, and diffused.
Directed Beam Infrared Directed beam infrared transmission provides the highest transmission speed. Here the receiver is aligned with the sender unit to create a point-to-point link. The range depends on the degree of focusing and the emitted power. The light source used in infrared transmission depends on the environment. Light emitting diode (LED) is used in indoor areas, while lasers are used in outdoor areas.
Ominidirectional: In ominidirectional configuration, a single base station is within the line of sight of all other stations in the LAN, and this station is typically mounted on the ceiling. This station then acts as a multiport repeater.

Wireless Local Area Network (WLAN): Security Risk Assessment and Countermeasures
Nwabude Arinze Sunday
- 7 -The ceiling station broadcasts ominidirectional signals which are received by all the other IR transceivers in the area, and these transceivers in turn transmit a directional beam aimed at the ceiling base station.
Diffused: The infrared light transmitted by the sender unit fills the area (e.g. office. Therefore the receiver unit located anywhere in that area can receive the signal.

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