Selasa, 01 Februari 2011

Wireless Standards






    perhaps most networker has to know about wireless networking standards
    released by the IEEE (Institute of Electrical and Electronics Engineers), which consists of a couple of types of generation of wireless standards. among which:
  1. 802.11
    This are first wireless standards released by IEEE in 1997. 802.11 was taken from a group formed to oversee the development of wireless. 802.11 unfortunately is only supported by the maximum network bandwidth of 2Mbps, and too slow for most applications. sehngga not produced anymore.


  2. 802.11bin July 1999, the IEEE create a new specification called 802.11b which supports up
    to 11Mbps. running at 2.4 GHz. but can be disrupted by various household appliances. such as microwaves, cordless phones, and other equipment that runs on the same frequency.
    *superiority of 802.11b :low cost, good signal coverage and is not easily obstructed;
    *weaknesses of 802.11b : slowest speed can be disrupted by maksmum and household appliances that use unregulated frequencies 2.GHz.

  3. 802.11a
    while the IEEE made a second extension, called 802.11a. 802.11b and 802.11a actually
    made together. but 802.11b gained popularity more quickly because 802.11a is more expensive than 802.11b. 802.11a runs at a frequency of 5GHz and supports 54Mbps bandwidth. with a higher cost, 802.11a is often used in business networks abroad. 802.11b while serving the domestic market. with 802.11a frequency differences, the two networks are not compatible with 802.11b.
    * superiority of 802.11g - the maximum speed; regulated frequencies prevent signal interference from other devices * weaknesses of 802.11a, high cost; shorter range signal that is more easily obstructe
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  4. 802.11g
    in the year 2022-2003, IEEE sets standards that combines 802.11a with 802.11b, named
    54Mbps 802.11g with bandwidth and runs at 2.4GHz frequency. because it runs on the same frekuennsi, then 802.11g is compatible with 802.11b. so that 802.11g will run on an 802.11b adapter.
    * superiority of 802.11g: maximum speed of 802.11g are fast, good signal coverage and is not easily obstructed
    * weaknesses of 802.11g : more expensive than 802.11b; appliances can interfere with the signal at a frequency that is not regulated.


  5. 802.11n
    Newest IEEE standard in Wi-Fi 802.11n category. It is
    designed to improve 802.11g in the amount of bandwidth
    that is supported by the many advantages of wireless signals and antennas (called MIMO technology) instead of one.
    When this are final standard, 802.11n connection must support data rates over 100 Mbps. 802.11n also offers somewhat better range over earlier Wi-Fi standard due to the increased signal intensity. 802.11n equipment will be backward compatible with 802.11g appliances.

    * superiority of 802.11n - fastest maximum speed and best signal range; more resistant to signal interference from outside sources
    * weaknesses of 802.11n - standard is not yet completed; cost more than 802.11g; use of the various signals can be very disturbing nearby 802.11b / g based networks.

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