| Author: PRAVEEN KUMAR.R 18 Apr 2008 | Member Level: Silver Points : 1 |
Nice
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 1 |
thank you praveen
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
Bluetooth
Wireless isn't just for Internet and computer-to-computer connectivity—it can also be used to move data between your Windows and your peripherals. This is where Bluetooth comes in. Bluetooth is a short-range, relatively low-speed wireless technology with an operating range of approximately 30 feet (10 meters) and a maximum transmission rate of only 1 Mbps.
If you think of Wi-Fi as Ethernet without wires, the comparable way to think of Bluetooth is USB without wires (though we're talking about the slower USB 1.0 standard used in most peripherals; USB 2.0 is quite zippy). For instance, hooking up a PDA used to require a USB-attached cradle, but you can now transfer data wirelessly between your windows and Palm via Bluetooth.
A word of advice: the Bluetooth technology and its implementation on the Windows is a work in progress. Early press about Bluetooth raved about how it could be used to hook up printers, keyboards, and mice. Unfortunately, Apple's Bluetooth support is tweaky at best; we've found that Bluetooth tends to be flaky, and sometimes it just fails to work at all.
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
Blue Tooth Vs Wi-fi Networking :
Bluetooth and Wi-Fi have slightly different applications in today's offices, homes, and on the move: setting up networks, printing, or transferring presentations and files from PDAs to computers. Both are versions of unlicensed spread spectrum technology.
Bluetooth differs from Wi-Fi in that the latter provides higher throughput and covers greater distances, but requires more expensive hardware and higher power consumption. They use the same frequency range, but employ different multiplexing schemes. While Bluetooth is a cable replacement for a variety of applications, Wi-Fi is a cable replacement only for local area network access. Bluetooth is often thought of as wireless USB, whereas Wi-Fi is wireless Ethernet, both operating at much lower bandwidth than the cable systems they are trying to replace. However, this analogy is not entirely accurate since any Bluetooth device can, in theory, host any other Bluetooth device—something that is not universal to USB devices, therefore it would resemble more a wireless Firewire.
Bluetooth
Bluetooth module from UK company, EZURiO that supports a range of 1km.
Bluetooth is implemented in a variety of new products such as phones, printers, modems, and headsets. Bluetooth is analogous to USB, and is acceptable for situations when two or more devices are in proximity to each other and don't require high bandwidth. Bluetooth is most commonly used with phones and hand-held computing devices, either using a Bluetooth headset or transferring files from phones/PDAs to computers.
Bluetooth also simplifies the discovery and setup of services. Bluetooth devices advertise all services they provide. This makes the utility of the service that much more accessible, without the need to worry about network addresses, permissions and all the other considerations that go with typical networks.
Wi-Fi
Wi-Fi is more analogous to the traditional Ethernet network and requires configuration to set up shared resources, transmit files, set up audio links (for example, headsets and hands-free devices). It uses the same radio frequencies as Bluetooth, but with higher power output resulting in a stronger connection. Wi-Fi is sometimes called "wireless Ethernet." Although this description is inaccurate, it provides an indication of its relative strengths and weaknesses. Wi-Fi requires more setup, but is better suited for operating full-scale networks because it enables a faster connection, better range from the base station, and better security than Bluetooth
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
Application of Bluetooth
Wireless control of and communication between a mobile phone and a hands-free headset or car kit. This was one of the earliest applications to become popular.
Wireless networking between PCs in a confined space and where little bandwidth is required.
Wireless communications with PC input and output devices, the most common being the mouse, keyboard and printer.
Transfer of files between devices with OBEX.
Transfer of contact details, calendar appointments, and reminders between devices with OBEX.
Replacement of traditional wired serial communications in test equipment, GPS receivers, medical equipment, bar code scanners, and traffic control devices.
For controls where infrared was traditionally used.
Sending small advertisements from Bluetooth enabled advertising hoardings to other, discoverable, Bluetooth devices.
Seventh-generation game consoles—Nintendo Wii[3], Sony PlayStation 3—use Bluetooth for their respective wireless controllers.
Receiving commercial advertisements ("spam") via a kiosk, e.g. at a movie theatre or lobby
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
Computer requirements for blue tooth :
A personal computer must have a Bluetooth adapter in order to be able to communicate with other Bluetooth devices (such as mobile phones, mice and keyboards).While some portable computers and fewer desktop computers already contain an internal Bluetooth adapter, most PCs require an external USB Bluetooth dongle. Most Macs come with built-in Bluetooth adapters.
Unlike its predecessor, IrDA, in which each device requires a separate dongle, multiple Bluetooth devices can communicate with a computer over a single dongle.
Operating system support
Mac OS X has supported Bluetooth since version 10.2 released in 2002. [4]
Of Microsoft platforms, Windows XP Service Pack 2 and later releases have native support for Bluetooth. Previous versions required the users to install their Bluetooth adapter's own drivers, which was not directly supported by Microsoft.[5] Microsoft's own Bluetooth dongles (that are packaged with their Bluetooth computer devices) have no external drivers and thus require at least Windows XP Service Pack 2.
Linux provides two Bluetooth stacks, with the BlueZ stack included with most Linux kernels. It was originally developed by Qualcomm and Affix. BlueZ supports all core Bluetooth protocols and layers.
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
Special feature of Blue tooth:
The Bluetooth specification was developed in 1994 by Sven Mattisson and Jaap Haartsen, who were working for Ericsson Mobile Platforms in Lund, Sweden. The specification is based on frequency-hopping spread spectrum technology.
The specifications were formalized by the Bluetooth Special Interest Group (SIG). The SIG was formally announced on May 20, 1998. Today it has over 7000 companies worldwide. It was established by Ericsson, Sony Ericsson, IBM, Intel, Toshiba, and Nokia, and later joined by many other companies. Bluetooth is also known as IEEE 802.15.1.
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
High speed Bluetooth :
On 28 March 2006, the Bluetooth Special Interest Group announced its selection of the WiMedia Alliance Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) version of UWB for integration with current Bluetooth wireless technology.
UWB integration will create a version of Bluetooth wireless technology with a high-speed/high-data-rate option. This new version of Bluetooth technology will meet the high-speed demands of synchronizing and transferring large amounts of data, as well as enabling high-quality video and audio applications for portable devices, multi-media projectors and television sets, and wireless VOIP.
At the same time, Bluetooth technology will continue catering to the needs of very low power applications such as mice, keyboards, and mono headsets, enabling devices to select the most appropriate physical radio for the application requirements, thereby offering the best of both worlds
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
Origin and Name of Bluetooth :
Bluetooth was named after a late tenth century king, Harald Bluetooth King of Denmark and Norway. He is known for his unification of previously warring tribes from Denmark (including now Swedish Scania, where the Bluetooth technology was invented), and Norway. Bluetooth likewise was intended to unify different technologies, such as computers and mobile phones.
The name may have been inspired less by the historical Harald than the loose interpretation of him in The Long Ships by Frans Gunnar Bengtsson, a Swedish Viking-inspired novel.
The Bluetooth logo merges the Nordic runes analogous to the modern Latin H and B: hagall and bjarkan from the Younger Futhark runes forming a bind rune
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| Author: Vinothkumar K 18 Apr 2008 | Member Level: Gold Points : 5 |
Scatternet :
A scatternet is a type of ad-hoc computer network consisting of two or more piconets. Both of the terms 'scatternet' and 'piconet' are typically applied to Bluetooth wireless technology
Description of a Scatternet
A piconet is the type of connection that is formed between two or more Bluetooth-enabled devices such as modern cell phones or PDA's. All Bluetooth enabled devices are "peer units" in that they have identical implementations. However, when a piconet is formed between two or more devices, one device is dynamically elected to take the role of 'master', and all other devices assume a 'slave' role for synchronization reasons. Piconets have a 3-bit address space, which limits the maximum size of a piconet to 8 devices (23 = , i.e. 1 master and 7 slaves.
A scatternet is a number of interconnected piconets that supports communication between more than 8 devices. Scatternets can be formed when a member of one piconet (either the master or one of the slaves) elects to participate as a slave in a second, separate piconet. The device participating in both piconets can relay data between members of both ad-hoc networks. Using this approach, it is possible to join together numerous piconets into a large scatternet, and to expand the physical size of the network beyond Bluetooth's limited range.
Currently there are very few actual implementations of scatternets due to limitations of Bluetooth and the MAC_address protocol. However, there is a growing body of research being conducted with the goal of developing algorithms to efficiently form scatternets
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| Author: Olufemi 18 Apr 2008 | Member Level: Diamond Points : 3 |
Good article and very educative but you would have summarize it for easy reading and comprehension. If the details are too much it make it boring to the readers and discouraging.
I will be happy if this advice can be taken into consideration.
Olufemi
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| Author: Raghav 19 Apr 2008 | Member Level: Diamond Points : 1 |
Very nice article on Bluetooth
raghav
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