Do You Know About Blu-Thooth?

blue tooth is initially conceived by Ericsson. The five founding members of the Bluetooth SIG are Ericsson, IBM, Intel, Nokia and Toshiba. On 1 December 1999 announced the founding members, 3Com, Lucent, Microsoft and Motorola, the founders came together to form the Promoter Group with the formation of companies. To date, more than 1,200 companies have signed am Bluetooth is a standard for a small, cheap radio chip to be connected to computers, printers, cell phones, etc.

Bluethooth is a cable replacement technology. It uses radio frequencies in the range of 2.45 GHz, the transmission of information over short distances of generally 33 feet (10 meters) or less. By integrating a Bluetooth chip and receiver into products, cables that normally carry the signal can be eliminated.

A Bluetooth chip is designed cable from the information that is normally done through the cable, and transmits them to a specific frequency to a receiver Bluetooth chip, replace the thenprovide the information received to the computer, phone whatever.

Bluetooth definitions

O Piconet: in an ad hoc manner, does not require specific design and is connected as a network standard. Two to eight devices can be networked in a piconet. This is a peer network that once connected, each device has equal access to others. However, a device is defined as the master, and the others as slaves.

O Scatternet: Multiple piconets can form a largeScatternet, with each piconet maintaining independence.

Unit or Master: The master synchronization in a piconet whose clock and hopping sequence for other devices.

or slave: the units in a piconet that are not perfect.

or MAC Address: Three-bit address that is different each unit in a piconet.

or units parked: Piconet devices that are synchronized, but not on MAC addresses.

Or sniff and hold mode: mode of energy saving device of a piconet.

OverviewBluetooth capability

These are the characteristics of Bluetooth technology:

1. It separates the frequency band of the hops. This spread spectrum is to jump from channel to channel, which adds a strong layer of security.
2. Up to eight devices can be networked in a piconet.
3. The signals can be transmitted through walls and folders, eliminating the need for line-of-sight.
4. Equipment must not be pointed at each other, as signalsomni-directional.
5. Both synchronous and asynchronous applications are supported, making it easy to implement a variety of devices and a variety of services such as voice and Internet.
6. Governments regulate the world so that you can use the same standard where ever you travel.

How could Bluetooth be used?

Well, it's a lot to our imagination. But the ambition is high, then virtually all electronic devices are usually in amodern office (and home) that is not a synchronous communication protocol could be adapted for use with Bluetooth.

Check out the list:

Cell phones and pagers, modems, LAN access devices, headsets, notebooks,
desktop and laptop computers, printers, fax machines, keyboards, joysticks, etc.

Virtually any digital device can be part of the Bluetooth system. Bluetooth wireless technology can also create a universal bridge to existing data networks, a deviceInterface and a mechanism to form small ad hoc groupings of connected devices away from fixed network infrastructures. The dynamic nature of Bluetooth connectivity allows you to replace this system with USB, and is an improvement on plug-and-play systems in which the operating system reboot to take effect.

Basic Bluetooth functions

Bluetooth technology is very complex. This is not so surprising when it is beingHandle. E 'especially on the IEEE 802.11, a brief description on the right. Described by the 2-mode network that uses Bluetooth Ad-hoc. This means that each station must respect "netiqette" and give to all other devices have fair access to the means of wireless communication.

The IEEE 802.11 standard defines the communication protocol for two types of networks, ad hoc and client / server.

The ad-hoc network is a simple system where there is the communication between multiple stations ina given coverage area without using an access point or server.The client / server network uses an access point that controls the allocation of broadcasting time for all stations and allows mobile stations to roam from cell to cell . The access point is used for network traffic from the mobile radio to manage wired or wireless backbone of the client / server. This arrangement allows for point coordination of all stations in the area of basic service and ensures proper handling ofTraffic. The access point routes data between the stations and other wireless stations or to and from the network server.

How does blue tooth work?

Bluetooth uses frequency hopping in time slots. Bluetooth is designed for radio frequency environments, and uses a rapid detection and frequency hopping system, the reliable communication channel, communication-wise. Bluetooth modules avoid interference from other signalsJump to a new frequency after transmitting or receiving a packet.
Compared to other systems on the same frequency band, the Bluetooth radio typically hops faster and uses fewer packets. This is because short packages and fast hopping limit the effects of microwaves and other sources of interference. The use of Forward Error Correction (FEC) limits the impact of noise on long-haul connections.

Establish network connections

To determinenew connections and investigative procedures are used for paging. The inquiry procedure enables a unit to discover that the units in the field, and what their device addresses and clocks. Take the page, a real link. Only the Bluetooth device address is needed to establish a connection. Knowledge of the Clock is to accelerate the installation process. A unit established a relationship to take a page procedure and will automatically become the masterthe connection.

For the process of paging, paging systems are used different. There is a compulsory scheme, the paging file from any Bluetooth device must be supported. This mandatory scheme is used when units meet for the first time, and in case the paging process directly to process your request. Two units, once connected to a pager binding / scanning scheme can be agreed on an option paging / scanning system.

What kind of traffic can Bluetooth handle?

Bluetoothis specially designed low-cost, robust, efficient, high capacity, ad hoc voice and data networking with the following features: Time:

1. 1 Mb / s transmit / receive frequency with the maximum available bandwidth of the channel.

2. Fast frequency hopping avoids interference.

3. Adaptive output power minimizes interference.

4. Short data packets maximize capacity during interference.

5. Fast acknowledge allows low coding overhead for links.

6. CVSD(Continuous Variable Slope Delta Modulation) voice coding enables operation at high bit error rates.

7. Flexible packet types supports a wide range of applications.

8. Relaxed link budget supports low-cost single-chip integration.

9. Send / receive interface tailored to minimize electricity

And on the Bluetooth security?

Security can mean two things in this context:

or A) We want to ensure that the transmitted data reaches theundamaged condition of the recipient.

or B) We also feel that these data are not the gutter has been abandoned by the parties for which it is not intentional.

Both problems are (obviously) addressed by Bluetooth.

secure data transmission

Transmissions are secure in a business environment and home? Yes, they are pretty reliable. Bluetooth is built in encryption and authentication so it is very adequate and safe in any environment. In addition tothis, hop a system of frequency hopping with 1600 / sec is used. This is much faster than any competing system. This, together with an automatic assumption on the range of output power to reduce the requirements exactly, makes the system extremely difficult to intercept.