We will be taking a closer look a various wireless technologies that include data transmitting and are linked to the family of radio standardized protocols 802.11(which is known as 802.11a, b or c), known in many circles as Wi-Fi (Wireless Fidelity) and 802.16, known as WiMax.
802.11b is an IEEE protocol since the 16 of September 1999 and it is probably the most common wireless network protocol used in most home use devices up to date. It used DSSS modulations and it operated on the frequency range of industry, science and medicine. If you use these protocols you don't need any licenses as long as you are using standardized devices. It has his limits as follows: the output power is up to 1 watt and the modulations are only those that can fit into the 2.412 and 2.484 GHz range. The maximum network speed while using devices with this protocol is 11 Mbps, but the average speed that has been calculated in home using is of 5Mbps.
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802.11g has been used since June 2003. Despite his late start, this protocol is in fact the standard protocol of wireless networks because it has been implemented in all laptops that have wireless cards incorporated and on most other portable devices. It used the same frequencies as 802.11b, but it uses the modulation type OFDM, which makes it better and faster. Its maximum network speed is of 54Mbps, with practical references of 25 Mbps. The transfer speed is flexible and can decrease sometimes to speeds that are even lower than 11Mbps, and the devices switches to DSSS modulation, to realize data exchange with the more popular 802.11b protocol.
802.11a is a known and certified protocol since September 1999. It used OFDM modulations and has a maximum speed of 54MBps. Because it operates on higher frequencies that the two protocols mentioned above, it is incompatible with them, so no connections can be made between them. In some countries, using these frequencies is not allowed without a license, so this is what makes the protocol less popular, even if the equipments are in fact cheaper.
802.16 has been a valid wireless protocol since 2004 and it can use various frequencies, some licensed and other unlicensed. The WiMax flexibility can offer attractive prices for a various range of services as VoiP telephony, video surveillance, distance monitoring, e-learning, ad-hoc networks for companies. This is often used by companies and juridical persons.
For persons with bad intentions, who are very well trained in the field, the security of all wireless protocols is questionable. The basic security methods that have been implemented in WI-Fi protocols assure a pretty low level of security, which pretty much stopped them from taking over for a while.
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