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Tuesday, October 8, 2013

What are uses of Wifi?

- Routers sometimes act as a Wi-Fi access point incorporating a cable modem or a DSL modem.
- These routers are installed in buildings and homes for providing Internet access and other inter networking services to the devices that in turn are connected to a either through a cable or wireless. 
- Similarly, there are routers that are powered by battery and they consist of a Wi-Fi access point and a mobile Internet radio modem. 
- Today smartphones come with this as a built-in capability.  
- However, this feature is disabled by the carriers. 
- The carriers might charge extra money for this. 
- The standalone facilities are provided by Internet packs. 
- The places where there is no network access, wifi is used. 
- Using Wi-Fi, a direct communication link between two computers can be established.  
- There is no intermediate point.  
- This type of transmission is termed as ad hoc wifi transmission. 
- This network mode is now very popular with the multi-player game consoles. Examples are:
       > Nintendo DS
       > PlayStation portable
       > Digital cameras
       > Other consumer electronic devices.

- A citywide Wi-Fi plan has been implemented by a number of the cities around the world.  
- In India, the first city to do so was Mysore.  
- The first city in the world was Jerusalem.
- The first city in United States was Sunnyvale in California to offer city-wide wifi. 
- Another type of wifi implementation is campus-wide wifi.  
- A number of colleges in United States have set up this kind of wifi network.  
The first university to have it was Carnegie Mellon University. 
- Using wifi, the local area Network can be deployed in very less cost.  
- There are places where it is not possible for the physical transmission medium such as cables to reach. 
- In such places wifi network is of crucial importance.  
- Also, wifi can be easily deployed in historical buildings and outdoor areas.  
Now, because of the increasing popularity of the Wi-Fi, the manufacturers are developing Wireless Network adapters for most of the notebooks and laptops.  
This eventually led to a fall in the price of the Wi-Fi chip set. 
- Today, the Wi-Fi chip set is economically feasible and is included in most of the devices.  
- There are many brands of client network interfaces and access-points that are competing with each other.  
- These interfaces are able to inter-operate at a basic level. 
- The Wi-Fi certification for the products is issued by wifi alliance. 
- This makes them backwards compatible with each other. 
- A standard Wi-Fi Device is supposed to work anywhere in the world. 
- The encryption standard that is considered secure is the WPA2 or wifi protected access.  
- But, this would work only if the pass phrase that is being used is strong enough. 
- The Wi-Fi has been made more suitable with the use of new protocols such as quality of service.  
- This has made wifi compatible with latency sensitive applications.  
- Nowadays, for extending battery life power saving mechanisms such as WMM are being used.  
- These are the major uses of wifi technology.
- The usage wifi has been limited because of its limited range. 
- Therefore, in order to cover up a large area several intermediate Wi-Fi access-points have to be set up. 
- The variations in the range can be produced by varying the frequency band.  
Wifi with a small frequency block works better than wifi with a larger frequency block.
- Wifi with the larger frequency blocks are optionally used. 
- The power of wifi network can be harnessed by using high gain direction antennas instead of using detachable antennas.  
- Another factor limiting the performance of wifi transmission is the local regulations. 
- Wifi also requires high power to operate upon. 
- This is a cause of concern for the devices' batteries.

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