This standard implements system of radio in band ISM (Industrial Scientifical Medical) of 900 Mhz and presents support WEP (Wired Equivalent Privacy). Standard 802.11a: This standard acts in nets in the frequency of 5 Mhz describing specifications in the layer of enlace and physics. Although to have been firmed in 1999, few devices exist that act in this frequency. Filed under: Mashable. Standard 802.11b: Wireless currently describes the implementation of the equipment use of more common and used nets. This standard includes aspects of the radio system and specifications of security.
It presents the use of protocol WEP. It works in the frequency 2,4 data-communication Ghz and speed of up to 11 Mbps and allows in the maximum 32 hardwired customers. ledge. Standard 802.11g: this is the most recent standard for nets without wire. Data-communication Ghz works in the frequency of 2.4 and to provide tax with up to 54 Mbps. This technology allows that equipment of standards the 802,11 and 802.11a works the same in surrounding exactly with the different frequency of both, moreover brings the positive characteristics of 802.11a.
Standard 802.11i: one is about a work group that this defining a new architecture of security for equipment of nets without wire, this technology aims at to cover the protocols 802.11a and 802.11g. Standard 802.11n: Known as WWiSE (World Wide Spectrum Efficiency), it has as main focus the transmission speed being able to go of 100 19 the 500 Mbps, the significant change for this speed is an modification carried through in its half one of transmission that is the OFDM (Orthogonal Frequency Division Multip lexing). 1.2.4 Physical layer the nets without wire use alternative ways for transmission of data, therefore the way with that the data are codified in relation the guided nets different must to this environment change. The protocol of sublayer MAC of the 802,11 is sufficiently different of the protocol of the Ethernet, due to complexida of inherent of the environment without wire, in comparison with the one of a physical system connected mind.