Spectrum **** **** **** Nob Narrowband Microwave **** ************** ** **************** * Yes unless ISM 2.3 WLAN SPECTRUM ALLOCATION The infrared and spread spectrum wireless LAN technologies operate in ISM (Industrial, Scientific, and Medical) bands. This radio spectrum is unlicensed. The table below shows the ISM frequency bands. Table 2Showing 900 MHz, 2.4 GHz and 5 GHz ISM Bands. ISM FREQUENCY BANDS Frequency (Lower Limit ) Frequency (Upper Limit) Total Bandwidth Max Power Max EIRP 902 MHz 928 MHz 26 MHz 1 Watt 4 Watt (+36 dBm) 2400 MHz 2483.5 MHz 83.5 MHz 1 Watt 4 Watt (+36 dBm) for multi-point, 200 W (+53 dBm) for point-to-point GHz 5.850 GHz 125 MHz 1 Watt (+30 dBm) 200 W (+53 dBm) 2.4 WLAN TOPOLOGIES The IEEE 802.11 standard defines three basic topologies to be supported by the MAC layer implementation. These are • Independent Basic Service Set (IBSS) • Basic Service Set (BSS) • Extended Service Set (ESS)
Wireless Local Area Network (WLAN): Security Risk Assessment and Countermeasures Nwabude Arinze Sunday - 10 -The 802.11 standard further defines the following two modes • Ad hoc • Infrastructure
