Bluetooth DUN is a wireless internet technology. This wireless device is used to connect to the internet using Bluetooth enabled cell phone as modem. It is a wireless protocol that enables communication to take place in PAN (Personal Area Network). It mainly uses the frequency hopping technique to transfer data in short distances. To make use of Bluetooth DUN, a Bluetooth laptop along with Bluetooth enabled mobile phone is a must. If Bluetooth is not enabled in your laptop, then Bluetooth adapter can be used. First, switch on Bluetooth on both the devices. The laptop will then detect the mobile phone within the perimeter.

The mobile phone is then connected to the internet using dial up access phone number (which is provided by internet service provider). Once the mobile phone is discovered in your laptop, choose the dial up networking service provider. After selecting this option, Bluetooth adapter will enable the internet access. Another technique of accessing internet is through routers. The router is a network device which interfaces multiple networks. To enable a wireless network, multiple wireless ROUTERS must be placed within specified area, so that internet is accessed through laptop or mobile phones within the area. Such areas are termed as Wi-Fi hotspots. Some examples of Wi-Fi hotspots are airports, coffee shops, libraries, etc.

The main advantage of using DUN is that the technique of accessing internet is used in areas where Wi-Fi is not present. The Bluetooth devices are used instead of modem. It does not require direct line of sight connection. The Bluetooth can be used on different OS. It is very inexpensive as it requires only two devices (a laptop and Bluetooth enabled mobile). The drawback of Bluetooth is that speed is very low. It is in range of kbps. The internet connection through routers requires a modem.

The routers require a WIFI enabled device to access internet. It is too costly when compared to Bluetooth. The main advantage compared to Bluetooth is speed. The speed of router connection is in range of Giga hertz. In router connection, multiple computers can access internet (by forming a network). In Bluetooth connection, the specific device can only access net, which is very slow. The router is used for providing internet within LAN (Local Area Network), WAN (Wide Area Network) and sometimes even MAN (Metropolitan Area Network), whereas Bluetooth is used only for PAN (Personal Area Network). The antenna is main component of router. The powerful antennas are used to boost the signal strength.

The Bluetooth enabled internet connection leads to heavy loss of data packets. The wireless router would minimize data loss and transmit packets efficiently. Both the above devices have advantages and disadvantages. The wireless routers form a major role for high speed broadband connection in WIFI hotspots and thus, cannot be eliminated. From the above facts, it is clearly understood that routers play a pivotal role in high speed internet access and therefore cannot be eliminated.

It is simple to pass the files form the system to other external units like fax machine, printers etc. It uses a wire-free mouse and a feather touch keyboard. You can have telephony headset. You can use your mobile phone as a mediator to connect Internet access with zero cables. This adapter has produced with the ability to connect up to 7 Bluetooth enabled devices simultaneously to create your PAN broadly known as Personal Area Network. The smart dimension of the unit is 0.3 x 0.8 x 7.5 cm as H x W x D. The product weighs just 28.1 grams.

There is no need of getting external power supply to power this adapter. Instead of that Linksys USBBT100 Bluetooth Wireless Adapter gets power directly from the USB port. It has come as an external adapter. It is simple to use WLAN standards with the ideal operating frequency up to 2.4 GHz. The maximum transmission speed of this Bluetooth technology is measured as up to 723 KB per second.

The encryption length of the Bluetooth technology in Linksys USBBT100 Bluetooth Wireless Adapter is 128 bit. You can use this device with distinct OS like:
• Microsoft Windows 2000
• Microsoft Windows 98 Second Edition
• Microsoft Windows Millennium Edition and
• Microsoft Windows XP.

As far as connecting users to share data, there are different ways, wired or wireless. In a wired communication, the devices are supposed to be connected using Ethernet cables on the private network or commonly over dial-up, DSL broadband, leased lines, dedicated links, packet switching, optical fibre, frame relays etc.

Another form of communication is over wireless radio transmission. These communications can be short, medium or long transmission. Shortest of all would be ZigBee, short one would a BlueTooth, medium range would be a Wireless or Wi-Fi or WiMax and long range communications would be over satellite or via mobile phones.

Last thing you need to get connected is a service provider that offers such connectivity. Some of the examples of network component that are being used to connect the users are Server Farms, Storage Area Networks, Wireless community networks, Jungle networks etc. a good research is required before enrolling to a service provider as you need to understand their offers and pick the one which fulfill your requirements.

A little about 802.11b: An IEEE standard with the speed ranging up to 11 Mbps, this was the great achievement in terms of getting rid of the wire and moving into a wireless network connection, although it was an expansion over 802.11a. A lot of wireless products emerged into the market, which were relatively cheaper in price with great capability of going wireless with good amount of data transmission rate and performance. It became the one stop shop for SOHO networks.

A little about Bluetooth: A wireless substitute which invented to serve Personal Area Network or PAN. This technology is mostly found in the digital cameras, mobiles phones, PDA’s as well as desktop computers. It servers the purpose of a peer-to-peer networking due to its low bandwidth of about 700 kbps and a maximum distance of about 30 feet. Bluetooth has capabilities of connecting at maximum 8 devices in a small LAN.

Wireless 802.11x

Wireless 802.11b is an IEEE standard given to WLAN or Wireless Local Area Networks which are compatible with the original 802.11 and 802.11a running on 2.4GHz with a speed ranging up to 11 Mbps. You can use this technology on a broadband connection as well on the Local Area Networks.

802.11x standards would work on the Data Link and Physical layer of the OSI model (this model defines the way of data transfer between these 7 layers) just like its previous members of the family. There job is to make sure the communication goes through successfully according OSI model either or a wireless or a wired LAN.

There are two modes Ad-hoc and infrastructure, on which a wireless 802.11b connection can be is established. Ad-hoc mode is a peer-to-peer connection and an infrastructure is a client-server connection to say is simply.

Advantages of a wireless connection are in terms of its cheap priced Interoperability with good data transfer rate of 11 Mbps with a good coverage area approximately around 100 meters.

Disadvantages are the Security and shared RF Band.

Bluetooth

Ericson was the first one to introduce Bluetooth technology in there devices as a short range data communication protocol. It was then approved and has been recognized by IEEE as 802.15 standard as many companies like Intel, Toshiba, Nokia clubbed together and formed a Bluetooth SIG group in 1998 which was later joined by giants like 3Com, Motorola, Microsoft and list goes on and on and today the list has gone up to 1500 members.

Due to its hopping segment technique running on unlicensed 2.4 GHz band its coverage area is short range only as the frequencies keep switching during the radio transmission for the fact it is not a legal transmission. Bluetooth is the most securest and robust form of data transmission and would operate at a slower speed.

Advantages of Bluetooth are again its inexpensive and scalable Interoperability with voice/data compatible ad-hoc devices consuming low battery power.

And Disadvantages are the low data transfer rate running on short range RF shared band.