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10 Cards in this Set
- Front
- Back
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802.11 |
Frequency - 2.4 GHz Speed - 1 to 2 Mbps Range - 20 feet indoors
Spread Spectrum - DSSS/FHSS |
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802.11a |
Frequency - 5 GHz Speed - Up to 54 Mbps Range - 25 to 75 feet indoors Spread Spectrum - OFDM |
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802.11b |
Frequency - 2.4 GHz Speed - Up to 11 Mbps Range - Up to 150 feet indoors Spread Spectrum - DSSS |
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802.11g |
Frequency - 2.4 GHz Speed - Up to 54 Mbps Range - Up to 150 feet indoors Spread Spectrum - DSSS |
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802.11n |
Frequency - 2.4 GHz / 5 GHzSpeed Speed- Up to 600 Mbps Range - 175+ feet indoors Spread Spectrum - OFDM |
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802.11ac |
Frequency - 5 GHzSpeed Speed - Up to 1.3 Gbps Range - 115+ feet indoors Spread Spectrum - OFDM |
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FHSS |
Frequency Hopping Spread Spectrum Requires the use of narrow band signals that change frequencies in a predictable pattern |
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DSSS |
Direct Sequence Spread Spectrum Signal is spread over a full transmission frequency spectrum For every bit of data sent, a redundant bit pattern is also sent (This 32 bit pattern is called a chip) providing security and delivery assurance. Minimizes effects of interference and background noise. |
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OFDM |
Orthogonal Frequency Division Multiplexing Distributes large amounts of data over 52 separate, evenly spaced frequencies. It splits the radio signal into the separate frequencies and simultaneously transmits them to the receiver. Reduces crosstalk interference. Associated with 802.11a, 802.11g, 802.11n, and 802.11ac as well as 4G mobile. Multiuser version OFDM (orthogonal frequency-division multiple access) |
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CSMA/CA |
Carrier Sense Multiple Access with Collision avoidance All IEEE 802.11 wireless standards use the CSMA/CA access method. Unlike CSMA/CD, which deals with recovering from collisions, CSMA/CA works to eliminate collisions. It does this by listening to see whether a medium is in use before transmitting and waiting until it is idle before transmitting. Collisions cannot be detected in wireless installations like they can in wired, so CSMA/CA is used in place of CSM/CD to minimize the possibility of collisions to make for more efficient use of the medium. |
