BLUETOOTH

Bluetooth networks feature a dynamic topology called a piconet or PAN. Piconets contain a minimum of two and a maximum of eight Bluetooth peer devices. Devices communicate using protocols that are part of the Bluetooth Specification. Definitions for multiple versions of the Bluetooth specification exist including versions 1.1, 1.2 and 2.0.Although the Bluetooth standard utilizes the same 2.4 Ghz range as 802.11b and802.11g, Bluetooth technology is not a suitable Wi-fi  replacement. Compared to Wi-Fi, Bluetooth networking is much slower, a bit more limited in range, and supports many fewer devices.

         Advantages of wifi

• WiFi uses unlicensed radio spectrum and does not require regulatory approval for individual deployers

• It allows local area networks (LANs) to be setup with cabling. The can reduce associated costs of network connection and expansions. Places where cables cannot be run, such as outdoor areas and historical buildings can use wireless LANs.
  
• WiFi products are extensively available in the market. There are different brands of access points and user's network interfaces are able to inter-operate at a very basic service level.

• Prices are considerably lower as competition amongst vendors' increases.
• WiFi networks can support roaming. This allows mobile users with laptop computer to be able to move from one access point to another.
• Numerous access points and network interfaces support various degrees of encryption to protect traffic from interception.
• WiFi has a set of global standards. Not like the cellular carriers, the same WiFi users can work in different countries around the world at all time.                                                                                                                               
  
  Disadvantages of wifi
  
• The use of WiFi band that is 2.4 GHz does not require a license in most countries provided that is stays below limit of 100mW and one accepts interference from other sources; including interference which causes the users devices to no longer function.

The spectrum assignments and operational limitations are not consistent worldwide. Power consumption is fairly high compared to some other standards, making the battery life and heat a concern to some users.

• WiFi uses the unlicensed 2.4GHz spectrum, which often crowded with other devices such as Bluetooth, microwave ovens, cordless phones, or video sender devices, and among many others. This may cause degradation in performance.
• WiFi networks have limited range. A typical WiFi home router might have a range of 45m (150ft) indoors and 90m (300ft) outdoors. Ranges may also vary as WiFi is no exception to the physics of radio wave propagation with frequency band.
• The most common wireless encryption standard, wired equivalent privacy or WEP has been shown to be breakable even when it has been correctly configured.
• Access points could be used to steal personal and confidential information transmitted from WiFi consumer.

Intervention of a closed or encrypted access point with other open access points on the same or a nearby channel can prevent access to the open access points by others in the area  . It poses a high problem in high-density areas such as large apartment blocks where many residents are operating WiFi access points.

• Inter-operability issues between brands or deviations can cause limited connection or lower output speeds.
• Free access points can be used by the malicious to anonymous to initiate an attack that would be extremely difficult to track beyond the owner of the access point.
  
  
  
  Uses of wi fi

•  Having the ability to connect to the internet anywhere we go is undoubtedly awesome, but it isn't the only gift Wi-Fi technology has given us. Here are our 10 favorite uses for Wi-Fi that go beyond accessing the web.

• If all the computers in your house are connected to a Wi-Fi network, you can easily connect your smartphone to the same network and control them. With apps like our favourite i-Tune,controlling, Remote app for iPhone, the all-encompassing Gmote for Android, and more XBMC remote than you can shake at stick at, you don't have to get up from your couch for anything anymore.
  
  Wifi applications

• Before discussing about WiFi Applications and WiFi uses lets have a look first at WiFI itself. A very simple statement for the understanding of WiFi term is that it is wireless networking between more than 2 computers keeping internet connectivity aside. So this distinction should be clear that wireless networking is different from wireless internet. However it is a mode to get internet connectivity. The term originated from the word HiFi, which stands for quality notes of music. So Wifi stands for wireless frequencies / fidelity which enable the inter connectivity of many computers hence a way to connect internet from the access point to the computer or laptop. For enabling WiFi you need to use a device access point or technically named router having wireless facility to receive or transfer the signal

• There are many applications of WiFi connectivity; you can take advantage of it in many different ways. Home-based Wi-Fi enabled device helps you to connect your PC, game console or laptop. If 2 or 3 members of your family have their own laptops they would be able to share their data, files and photos. They can take prints by connecting their laptops to the PC or through print server. Moreover there is no mess of wires and your surrounding remains clean.

• There are no boundaries if you are using Wi-fi, you move from one room to another or even away from home you have the liberty to access internet within the range of radial distance. Just go for security measurements.  

• In an office set up, all the computers can be interconnected and enable check and balance whether employs are working or not. A project can be presented to all the members whether in the form of excel sheet, ppt or word document.

• Also you can share windows if you are delivering lecture, it would help you make your lecture effective as they not only hear you but also receiving the visual information. Many public places are also supplied with WiFi connectivity to access internet like café, restaurants, and clubs to attract the clients. A prospect customer surely appreciates your efficiency and awareness of the modern fast-paced world.
• WiFi hotspots concept is getting popularity among business communities and mobile workers. For this purpose ISPs are incorporating WiFi routers to many places for the coverage of wide range. The accessibility of internet is somewhere free and somewhere you have to pay for internet connectivity per hour or of the package for which you go. These routers are the access point for internet while attached to the DSL modem or cable modem.Now-a-days, computers, laptps and mobiles are WiFi oriented so two computers or two laptops are easily connected without access point. This is the most modern WiFi technology. A prospect businessman surely utilizes this Wi-Fi technology to increase the workers’ output. You can produce efficient workforce to enhance your business.
  A whole city can provide WiFi connectivity by deploying routers at specific rang to access the internet. It seems unbelievable and even inapplicable in the beginning but now in European countries some of the cities are wholly Wi-Fi.
  
  
  
  • It is now also a very common application of WiFi that a whole campus is having a single access point at a certain height and all of the student can take benefits from it. For this they have to pay a monthly fee through their monthly fee-bill.
  
  
  • WiFi is not limited to private users or small-business communities. Its future is predictable as WiFi is applicable in a versatile modes and profitable ways. Everyone whether starting a home-based business or a world-wide mobile business is heading for the WiFi technology to prosper their business by leaps and bounds.