28-08-2013, 02:55 PM
Wireless Wimax
[attachment=57526]
Radio Waves
These waves have been found able to transmit milli-watts of power up to a distance of 15 meters. This technology is now being employed to recharge small portable devices which include mobile phones and laptops.
Laser Beam
The use of laser technology to transmit power wirelessly has so far shown only 15% efficacy. Beams of laser are targeted on photocells which convert the light energy into electrical energy and thus power is produced. So far the application of this means stretches as far as lamps and speakers
Magnetic Induction
Both radio waves and lasers have applications only for the devices that require small amounts of power to operate. What about those requiring larger amounts of electricity. For such devices magnetic induction is used to transmit the power without using wires.
Wi-Fi (Wireless Fidelity)
-Is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connections.
-WI-FI is ageneric term that refers to IEEE 802.11Communications standard for (wlan).
-wi-fi network connects computers to each other ,to the internet and to the wired
network.
-works on physical and data link layer.
How a Wi-Fi Network Works
-A Wi-Fi hotspot is created by installing an access point to an internet connection.
-An access point acts as a base station.
-When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly.
-A single access point can support up to 30users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors.
-Many access points can be connected to each other via Ethernet cables to create a single large network.
WEP's major weakness
WEP's major weakness is its use of static encryption keys. When you set up a router with a WEP encryption key, that one key is used by every device on your network to encrypt every packet that's transmitted. But the fact that packets are encrypted doesn't prevent them from being intercepted, and due to some esoteric technical flaws it's entirely possible for an eavesdropper to intercept enough WEP-encrypted packets to eventually deduce what the key is.
[attachment=57526]
Radio Waves
These waves have been found able to transmit milli-watts of power up to a distance of 15 meters. This technology is now being employed to recharge small portable devices which include mobile phones and laptops.
Laser Beam
The use of laser technology to transmit power wirelessly has so far shown only 15% efficacy. Beams of laser are targeted on photocells which convert the light energy into electrical energy and thus power is produced. So far the application of this means stretches as far as lamps and speakers
Magnetic Induction
Both radio waves and lasers have applications only for the devices that require small amounts of power to operate. What about those requiring larger amounts of electricity. For such devices magnetic induction is used to transmit the power without using wires.
Wi-Fi (Wireless Fidelity)
-Is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connections.
-WI-FI is ageneric term that refers to IEEE 802.11Communications standard for (wlan).
-wi-fi network connects computers to each other ,to the internet and to the wired
network.
-works on physical and data link layer.
How a Wi-Fi Network Works
-A Wi-Fi hotspot is created by installing an access point to an internet connection.
-An access point acts as a base station.
-When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly.
-A single access point can support up to 30users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors.
-Many access points can be connected to each other via Ethernet cables to create a single large network.
WEP's major weakness
WEP's major weakness is its use of static encryption keys. When you set up a router with a WEP encryption key, that one key is used by every device on your network to encrypt every packet that's transmitted. But the fact that packets are encrypted doesn't prevent them from being intercepted, and due to some esoteric technical flaws it's entirely possible for an eavesdropper to intercept enough WEP-encrypted packets to eventually deduce what the key is.