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