| 1 |
standard: IEEE 802.11
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| 2 |
types of implementation:
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DSSS -- Direct Sequence Spread Spectrum (higher performance)
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FHSS -- Frequency Hopping Spread Spectrum (lower cost)
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| 3 |
OSI Physical layer (Access Point, antennas, LAN interfaces)
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radio-frequency-based -- FCC license not required for the following frequencies 902-928 MHz, 2.4-2.4835 GHz, 5.725-5.850 GHz
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infrared-based -- no government regulations
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| 4 |
OSI Data Link layer:
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DFWMAC - Distributed Foundation Wireless Media Access Control
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access method: CSMA/CA - Carrier Sense Multiple Access with Collision Avoidance (no ability to detect collisions)
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| 5 |
typical parameters:
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data rates: 2 Mbps, 10 Mbps
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distance: up to 3 miles; up to 10 miles with amplifiers;
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up to 30 miles - point-to-point without obstacles (mountains, hills)
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| 6 |
topologies: point-to-point, point-to-mulitipoint
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