Computel.net

WIRELESS NETWORKS
To the traditional computer/telephone connectivity methods of copper wire and fiber optic cable, there is now “air”, or wireless. Wireless provides unparalleled flexibility and overcomes distance limitations. Applications are and will continue to grow regularly. In addition to wireless LAN’s (WLAN), there is Voice over Internet Protocol (VoIP) wireless, wireless pager systems, radio frequency identification (RFID), wireless security and more to come. New standards and advanced equipment and techniques are minimizing security concerns in many instances.

CompuTel can provide wireless survey’s to identify coverage areas and locations for Wireless Fidelity (WiFi) Access Points (AP) and complete all the necessary cabling and connectivity.

A brief description of the current standards and links to more detailed information follows.

Most new laptop computers include a Wireless Fidelity (WiFi) card with one or more of the approved wireless standards which are:
802.11b
  • was the first widely accepted wireless standard
  • uses the unregulated 2.4GHz Industrial Scientific Medical (ISM) band of the radio frequency spectrum along with cordless phones, microwave ovens, Bluetooth devices and other appliances
  • can be prone to unpredictable interference problems from other device in 2.4GHz band
  • typical indoor range at maximum raw data rate of 11Mbit/s is 100 feet which drops to 1Mbit/s at 300 feet from the WiFi Access Point (AP)
  • realistic throughput is 5.9 Mbit/s over TCP and 7.1 Mbit/s over UDP
  • lowest cost WiFi alternative
802.11a followed 802.11b – we leave it to the technocrats to explain why a follows b
  • uses the 5GHz band of the radio frequency spectrum
  • less susceptible to interference than 802.11b due to using the 5GHz band
  • use of higher 5GHz band reduces range below 802.11b as it can’t penetrate as far as 802.11b and may be reduced to line of sight because it’s signal is more easily absorbed
  • maximum raw data rate of 54Mbit/s (generally yielding realistic throughput in the mid-20’s)
  • more costly than 802.11b due to need for more AP’s because of lower range/line-of-site issue
802.11g followed 802.11b and a
  • uses the 2.4GHz band of the radio frequency spectrum that 802.11b uses
  • can be prone to unpredictable interference problems from other device in 2.4GHz band
  • uses 802.11a modulation technology to generate higher data rates than 802.11b
  • maximum raw data rate of 54Mbit/s (generally yielding realistic throughput of 24.7Mbit/s
  • maximum range is greater than 802.11b devices but range at which full 54Mbit/s is achieved is much shorter than 802.11b
802.11n
  • estimated real data throughput to be 540Mbit/s which would be up to 100 times faster than 802.11b and 10 times faster than 802.11a or 802.11g
  • projected to offer better range than current standard network options
These standards are part of the basic Wi-Fi standard – IEEE (Institute of Electrical and Electronics Engineers) 802.11 which refers to the original 802.11, which is now sometimes called "802.11legacy."

Further detailed information may be found in Wikipedia – The Free Encyclopedia as follows:
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