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Wireless Basic Notions Understanding Wireless Concepts
Because the wireless technology has evolved so fast there are many notions, protocols, definitions and terms that appear each day and most of them have meaning that are not deductive and are not understood correctly by the general public.
Open system is referring to a type of security that is include in wireless routers. It means that the client is identifying himself in the wireless network using his hardware address of the network card. For the infrastructure mode, the access point can have a list of hardware addresses configured, so that he knows what addresses to allow to connect. For the ad-hoc mode any hardware address is accepted in the wireless network.
Shared Key - means that an access point will verify of you know the secret network key when you want to connect to the network. The key has to be made public to all the clients of the access point and to the access point itself.
IEEE 802.1x - This wireless standard has been created for the wired Ethernet networks and them was adapted for utilizing it on wireless network using the extensible autentification protocol and other specific methods of connecting to the network.
Preshared Key - this is a method that is used for small and home networks in the infrastructure mode for encryptions like WPA and WPA2. The keys are configured in the access point and then in each client.
The connection 802.11b is like a half-duplex, because it can only send or receive data at a certain moment in time. This is the reason why the speed of traffic is usually half the connection speed. For a good quality signal and when WEP is not active, the speed is somewhere around 3.5-4.5Mbps and with WEP activated around 2.5-3.5 Mbps. This speed decreases if the signal decreases.
The wireless connection assures networks on limited distances, being influences by interferences with equipments that use the 2.4 GHz frequency (like cordless phones, microwaves). Perturbing the wireless signal will lead to errors, and some packets might need retransmitting, and the transfer speed will decrease.
A new wireless standard that is not accepted yet is called 802.11n, but it still is draft stage. This is a dual band standard and it can use both 2.4 GHz and 5 GHz frequencies, with a speed of maximum 248Mbps. This is the new generation of wireless networks at high speeds that can run on the network applications with a big broadband like video streaming and multimedia games. They also have a bigger range. This standard is based on the technology of MIMO, which means multiple inputs, multiple outputs.
About the Author Mark Dunne is a writer providing advice on Wireless USB if you have time drop by his site for some tips and information.
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