What do you know about Blue-Thooth?

Blue tooth was originally designed by Ericsson. The five founders of the Bluetooth SIG are Ericsson, IBM, Intel, Nokia and Toshiba. December 1, 1999 announced the founding members, 3Com, Lucent, Microsoft and Motorola have joined together to form the founders of the Promoter Group with the formation of society. To date, more than 1,200 companies have signed. Bluetooth is a standard for a small set Cheap radio chips, 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 cables, to replace the information normally carried by the cable, and transfer of a specific frequency to a receiver Bluetooth chip, which thenprovide the information received to the computer, phone whatever.

Bluetooth definitions

O Piconet: devices so ad hoc, and do not require specification and associated planning, than with a standard network. Two to eight devices can be networked in a piconet. This is a peer that is, if each connected device has the same access to the other. However, one unit is defined as the master and the others as slaves.

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

O Master piconet units: the master clock and hopping sequence which synchronizes the other devices.

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

or MAC Address: Three-bit address to each device is characterized in a piconet.

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

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

OverviewBluetooth

These are the characteristics of Bluetooth technology:

It first separates the frequency band in hops. This spread spectrum-hop is used between channels, a strong increase security.
According Up to eight devices can be networked in a piconet.
Third signals can be transmitted through walls and folders, eliminating the need for line of sight.
Fourth equipment should not be pointed at each other, how signals areomni-directional.
Fifth Both synchronous and asynchronous applications are supported, making it easy to implement on a variety of devices and a variety of services such as telephony and Internet.
Sixth governments rule the world, then you can use the same standard wherever one travels.

How could Bluetooth be used?

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

Check this 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, USB, and is an improvement on the plug-and-play systems in which the operating system to install reboot to take effect.

Basic Bluetooth functions

Bluetooth technology is very complex. Not so surprising given the role to beHandle. And 'especially on the IEEE 802.11 standard, a brief description on the right. Described by the two modes of network use the Ad-Hoc mode Bluetooth. This means that the media needs to look at each netiqette station "and all other units provide fair access to the wireless network.

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 network where communication is established between multiple stationsa coverage area of the data 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 move from one cell another. The access point is used to handle radio traffic from mobile phones to wired or wireless backbone of the client / server network. This provision 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 the Blue Tooth work?

Bluetooth uses frequency hopping in time slots. Bluetooth is designed to operate in noisy radio frequency environments, and uses a fast acknowledgment and frequency hopping system, the communications link robust, communication-wise. Wireless Bluetooth modules to avoid interference from other signalsJumping on a new frequency after transmitting or receiving a packet.
Compared to other systems in the same band, the Bluetooth radio typically hops faster and uses shorter 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.

Creating Network Connections

To determinenew compounds and the demand paging procedure is used. The inquiry procedure enables a unit to discover that the measures are in use, and what their device addresses and clocks. The encryption process of paging an actual connection. Only the Bluetooth device address is needed to establish a connection. Knowledge of the Clock is to accelerate the installation process. A device that performs a series of proceedings and a link to the page will automatically become the masterthe connection.

For the process of paging, paging systems longer apply. This is a mandatory system, the paging file that are supported by each Bluetooth device. This mandatory scheme is used when units meet for the first time, and in case the paging process directly follows to handle the request. Two units, once connected to an obligation paging / scanning system on an optional agreement paging system scan.

What kind of traffic can Bluetooth handle?

Bluetoothwas specifically designed for low cost, robust, efficient, high capacity, ad hoc voice and data networks provides the following features:

Before 1 Mb / sec transmission / reception rate exploits maximum available channel bandwidth.

According to Fast frequency hopping avoids interference.

Third Adaptive output power minimizes interference.

Fourth Short data packets maximize capacity during interference.

Fast fifth for the recognition of coding low overhead for links.

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

Seven types of flexible packages supports a wide range of applications.

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

Ninth develops send / receive interface to minimize electricity

And the Bluetooth security?

Security can mean two things in this context:

o) We want to ensure that data arrive in neednon-damaged condition of the recipient.

or B) We also feel that this information is not declined gutter parts for which it is not intentional.

Both problems are (obviously!) Addressed via Bluetooth.

secure data transmission

If a business transfers and secure home environment? Yes, they are quite reliable. Bluetooth has built in sufficient encryption and authentication and is very safe in any environment. Overthis, a frequency hopping with 1600 hops / sec is used. This is much faster than any competing system. This fall, with an output power of automatic across the range exactly the requirement makes the system extremely difficult to intercept.