Karteikarten
Wireless Networking Standards
Karten in diesem Stapel (8)
- 1802.11a5.75 GHz (U-NII), 54 Mbps, 150 Ft, 23(12) channels, OFDM, backwards compatibility non applicable.
- 2802.11b2.4Ghz (ISM), 11Mbps, 300 Ft., 11(3) channels; DSSS, CCK, DQPSK, DBPSK. Not backwards compatible.
- 3802.11g2.4Ghz (ISM), 54Mbps, 300Ft, 11(3) channels, DSS (and others at lower data rates. At higher data rates, OFDM, QPSK, BPSK. Backwards compatible with 802.11b.
- 4802.11n2.4GHz (ISM) or 5.75GHz (U-NII), up to 600 Mbps. 1200 Ft., 2.4 GHz setup has 11 (3 or 1) channels, 5.75 GHz has 23 (12 or 6). OFDM and others depending on implementation. Backwards compatible with all depending on implementation.
- 5Multiple Input Multiple Output (MIMO)802.11n uses multiple send and receive radios (MIMO). The use of multiple antennas both at the transmitter and receiver improves the performance (stronger signal and increased speed) of radio communication systems.
A system is described by the number of sending and receiving radios. The 802.11n specifications allow up to 4 sending and 4 receiving radios. The benefit of adding additional radios declines as the number increases. Going above 3x3 offers little practical return. - 6Channel BondingSimilar to Ethernet Bonding, Channel bonding combines two non-overlapping 20-MHz channels into a single 40-MHz channel, resulting in slightly more than double the bandwidth.
• The 5.75 GHz range has a total of 23 channels, with 12 of those non-overlapping. This allows for a maximum of 6 non-overlapping bonded (combined) channels.
• The 2.4 GHz range has a total of 11 channels, with 3 of those non-overlapping. This allows for a maximum of 1 non-overlapping channel. For this reason, channel bonding is typically not practical for the 2.4 GHz range. - 7Antenna diversityAntenna diversity implements multiple antennas to combat multipath interference and improve the reliability of a wireless link. Antenna diversity addresses multipath interference by implementing multiple antennas on the same receiver. Each antenna is placed such that it receives signals from a different path.
Antenna diversity can be implemented in several ways:
• Spatial diversity uses multiple antennas that are physically separated from one another.
• Pattern diversity uses two or more co-located antennas with different radiation patterns. - 8Frame composition802.11n changes the frame composition, resulting in increased efficiency of data transmissions (less overhead).
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- ? Network Architecture Karteikarten am Wireless Networking Standards, erstellt von Kimberly S. am 11/10/2015.
- Erstellt von
- Kimberly S.
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