A wireless LAN (or WLAN, for wireless local area network, sometimes referred to as LAWN, for local area wireless network) is one in which a mobile user can connect to a local area network (LAN) through a wireless (radio) connection. The IEEE 802.11 group of standards specify the technologies for wireless LANs. 802.11 standards use the Ethernet protocol and CSMA/CA for path sharing and include an encryption method, the Wired Equivalent Privacy algorithm. A wireless local area network (WLAN) is a local area network (LAN) that doesn’t rely on wired Ethernet connections. Originally WLAN hardware was so expensive that it was only used as an alternative to cabled LAN in places where cabling was difficult or impossible.A WLAN can be either an extension to a current wired network or an alternative to it.

Use of a WLAN adds flexibility to networking. A WLAN allows users to move around while keeping their computers connected. The private home or small business WLAN Commonly, a home or business WLAN employs one or two access points to USB WIRELESS LAN Adapter RT3070 broadcast a signal around a 100- to 200-foot radius. You can find equipment for installing a home WLAN in retail stores like Office Max, Radio Shack, Target, and Walmart, among others. Using technology from the Symbionics Networks, Ltd., a wireless LAN adapter can be made to fit on a Personal Computer Memory Card Industry Association (PCMCIA) card for a laptop or notebook computer. For the home user, wireless has become popular due to ease of installation, and location freedom with the gaining popularity of laptops. Public businesses such as coffee shops or malls have begun to offer wireless access to their customers;USB WIRELESS LAN Adapter some are even provided as a free service. Large wireless network projects are being put up in many major cities: New York City, for instance, has begun a pilot program to cover all five boroughs of the city with wireless Internet access. The third generation of wireless modem then aimed at compatibility with the existing LANs with data rates on the order of Mbit/s.

Several companies developed the third generation products with data rates above 1 Mbit/s and a couple of products had already been announced by the time of the first IEEE Workshop on Wireless LANs. WPA implements higher security and addresses the flaws in WEP, but is intended to be only an intermediate measure until further 802.11i security measures are developed. Although a WAN by definition is the exact opposite of a LAN, wireless WANs (WWANs) deserve brief mention here, http://www.papatek.com/Network-Device/  USB 802.11N 150/300M WIRELESS LAN Adapter especially because the distinction is becoming less and less obvious to end users.

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Computers without working wireless antennas may be upgraded with either an internal or external wireless LAN card. To connect to your favorite Internet hotspot or home network,

You must finish the installation by installing the device’s drivers–files that allow the device to communicate with your operating system. You can have Windows install the drivers, let Windows update the drivers or manually install the latest drivers yourself.

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Boot up your computer. Insert the installation and drivers disk included with your wireless LAN card. Click on “Start the Installation,” “Install the Software” or another similarly titled phrase.

Follow the onscreen prompts. Shut down the computer and install the card into an available slot on your motherboard, if applicable, then restart the computer. (Some older cards such as

Linksys’ internal WMP54G require you to install preliminary software prior to physically installing the card.) Finish the installation. http://www.papatek.com/PCI-Wireless-LAN-Card

Install the Drivers Via Windows
Install your internal card. Boot up the computer.

Connect to the Internet after Windows loads, then insert your external wireless LAN card.

Allow Windows the opportunity to automatically detect your device and to install drivers. Manually Update Drivers

Click on “Start,” then “Control Panel.” Click on “Classic View” in the left column, if available.

Open “System.” Click on “Device Manager” in Windows Vista and in Windows 7. Click on the “Hardware” tab, then “Device Manager” in Windows XP.

Double-click “Network Adapters,” then double-click your previously installed wireless LAN card. (You must install your LAN card prior to updating the drivers, or it not be listed in the Device Manager.)

Click on the “Driver” tab. Click on “Update Driver,” then “Search Automatically” or “Browse My Computer” if you downloaded drivers from the manufacturer’s website. Follow the onscreen prompts to finish the driver installation.

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Many “smart devices” and computers are equipped with a built-in wireless LAN card that allows these devices to connect to wireless Ethernet networks. The device, while specifically allowing for the wireless network connection of devices into wireless access points and ad hoc networks, is made in many sizes and form factors, all of which can be considered as built-in wireless LAN cards. The most common appliance to contain such a device and call it by this name is a laptop computer. http://www.papatek.com/USB-Wireless-LAN-Adapter/802.11g-WIRELESS-USB-54Mbps-Adapter.html

Wireless LAN description
A wireless Local Area Network (LAN) is a standard Ethernet network that uses radio frequency radio transceivers instead of wires to connect computers and other devices into the Ethernet network. Each device uses a wireless LAN card to send and receive data from the other, analogous to the way a wire allows the same communication type.

Interface
Many laptop computers utilize a mini-PCI interface for the connection of the wireless LAN card into the laptop. Other options are PCMCIA and USB, but these interfaces are not the type that built-in wireless LAN cards use. Some systems have the wireless card circuitry built into the motherboard, but the modular design of mini-PCI is favored.

Wireless Protocols
Wireless LAN cards can use any of the IEEE 802.11 standards the controller chip supports. The most common are the standards: b, g, a, n. Maximum throughput speeds increase with time, and the old 11 Mbps “b” cards are a fraction of the 200-plus Mbps “n” standard. Protocols also vary in range and receive sensitivity. http://www.papatek.com/USB-Wireless-LAN-Adapter/USB-802.11N-150M-WIRELESS-LAN-Adapter(RT3070-Chipset)-slim.html

Popularity of Built-In Wireless LAN Cards
The explosion of popularity in wireless networking has led to the almost ubiquitous implementation of wireless LAN cards in all laptop computers and any other portable computer-like device. Any laptop purchased would be expected to have wireless capability as a standard feature, whereas a few years ago, it was an expensive addition.

Benefits
Wireless LAN cards allow people to compute with LAN, and often Internet, access without the constraints of wires. The benefit of mobility in computing cannot be understated in the scenarios where instant local computing, as well as networked data access, is mandatory. Also, the cost of implementation can be significantly lower than a wired connection in some circumstances.

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WIRELESS LAN’S

A Wireless LAN is a wireless local area network that connects two or more computers or devices without using wires. It is commonly called as WLAN.

It was developed by IEEE 802.11(Institute of electrical and electronic engineering). 802.11standards use the

Ethernet protocol and CSMA (carrier sense multiple access with collision avoidance) for path sharing.

WLAN devices allow users to move their laptops from one place to another place within their offices without the need for wires and without losing network connectivity.
WIRELESS LAN’S:

Wireless LAN’s allow greater flexibility and portability than the traditional wired LAN, that the wired LAN requires a wire to connect a user’s computer to a network

But the WLAN connects computer to a network using an access point devices. This access point communicates with devices equipped with wireless network adaptors and it connects to a wired Ethernet LAN. This access point

Devices have a coverage area up to 300 feet (approximately 100 meters).
 WIRELESS LAN COMPONENTS:

A Wireless LAN comprises two types of equipments.

A wireless stations are equipped with wireless networks interface card (NIC).Access points are base station for the wireless networks, they transmit and receive radio frequency to communicate with wireless devices. Wireless clients can be mobile device such as laptops, personal digital assistants, I phones and fixed devices such as desktops and workstation that are equipped with the wireless network interface (NIC).

Nowadays WLAN are becoming popular in more wide range of business customers.

For example:
Hospitals, Universities, Hotels, retail shops are using this wireless technology to conduct their daily business operations.

BENEFITS:
Wireless LAN’s offer five primary benefits
USER MOBILITY:
Users can access files, network resources and internet without physically connected network to the wires.
RAPID INSTALLATION:

The installation time is very less because the network connection can be made without adding wires, or pulling it through walls or ceiling, or making modification to the infrastructure cable plant.

REDUCED COSTS:

The initial investment of wireless LAN is little higher than the wired LAN, but there is no need of installation charges and the wiring charges.
SCALABILITY:
      WLAN network topologies can easily be configured to meet specific application and installation needs and to scale from small peer to peer network to very large enterprise network that enable roaming over a broad area.
FLEXIBILITY:
Users can quickly install a small WLAN for temporary needs such as a conference, tradeshow or in the meetings. It is flexible so we can take WLAN in our necessary locations.

So Wireless LAN’s is best to fit your computers or devices to communicate over a network.

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A wireless adapter card plugs into a PC Card or PCI slot in your computer system or laptop creating laptop mobility. In order to gain Internet access, you also need a wireless router to create the wireless LAN. The IEEE 802.11 group is the standard specified technology for wireless LANs. See if the wireless card became loose. If your laptop was moving around in the car or if you dropped it, the wireless card may have become disabled or loose.

 Look on the front of your computer or laptop for a button or a slider indicating the wireless can be disabled and enabled. Be sure the setting is set for enabled. Check the Device Manager to see that it is set properly. Right click “My Computer,” select “Manage” and then double click “Device Manager.” Look in the panel on the right and double click “Network Adapters.” This container will open and you may notice more than one card in the list. Right click the “Wireless card” and select “Properties.”

A new window will open; choose the “General” tab to see the status of the device. Under “Device Usage,” “use this device” should be set to “enable.” If this option is set at “disabled,” use the drop down box and choose “enable.”USB WIRELESS LAN Adapter(WIRELESS USB LAN Adapter) Determine if you lose connectivity all the time or just occasionally. If it is only occasionally, there is a service called Wireless Zero Configuration, which may be causing the problem with your wireless connection. To disable it click “Start” and select “Control Panel” and “Administrative Tools.” Select “Services” and scroll down to the “Wireless Zero Configuration.” It will probably be set as “Started.” Right click and select “Stop.”

Use the Internet for a few days to see if you notice improvement. If you do, keep this option set to “disabled.” Your computer needs the Wireless Zero Configuration program running in order to make the wireless connection. There is a freeware program available, called Wireless FiXP, which will solve this problem. You can create a shortcut and put it in your Startup folder and every time you start your computer, this program will automatically start the Wireless Zero Configuration. The program will wait until your computer successfully connects to the Internet and it will then automatically shut down.PCI Wireless LAN Card(Wireless PCI LAN Cards)

Visit overclockers.com for you free download of Wireless FiXP. Download the Wireless FiXP program and unzip it.Open the folder and right click the “FiXP icon” and select “Create Shortcut.” Then open your Startup folder and drag the Wireless FiXP shortcut icon into it. Two Pieces 200Mbps PowerLine Communication Adapters(Transmission of broadband data through power line)

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