Bluetooth - Wikipedia. This article is about a wireless technology standard. For the medieval king of Denmark, see Harald Bluetooth. Bluetooth is a wireless technology standard for exchanging data over short distances (using short- wavelength UHFradio waves in the ISM band from 2. GHz. Invented by telecom vendor Ericsson in 1. The Bluetooth SIG oversees development of the specification, manages the qualification program, and protects the trademarks.

The purpose was to develop wireless headsets, according to two inventions by Johan Ullman, SE 8. SE 9. 20. 22. 39, issued 1. Nils Rydbeck tasked Tord Wingren with specifying and Jaap Haartsen and Sven Mattisson with developing. Both were working for Ericsson in Lund. The idea of this name was proposed in 1. Jim Kardach of Intel who developed a system that would allow mobile phones to communicate with computers.

The rickroll stunt was just one hack at the security conference DEF CON, which ran a three-day Voting Machine Hacking Village to test the security of various machines.

As Gizmodo reports, iRobot’s privacy policy could be interpreted to give the company permission to sell your data without asking you. InformationWeek.com: News, analysis and research for business technology professionals, plus peer-to-peer knowledge sharing. Engage with our community. Install Tomcat Native Library Centos Commands here. Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz.

At the time of this proposal he was reading Frans G. Bengtsson's historical novel The Long Ships about Vikings and King Harald Bluetooth. Bluetooth uses a radio technology called frequency- hopping spread spectrum. Bluetooth divides transmitted data into packets, and transmits each packet on one of 7. Bluetooth channels.

Each channel has a bandwidth of 1 MHz. It usually performs 8. Adaptive Frequency- Hopping (AFH) enabled.

Since the introduction of Bluetooth 2. EDR, . Devices functioning with GFSK are said to be operating in basic rate (BR) mode where an instantaneous bit rate of 1 Mbit/s is possible. The term Enhanced Data Rate (EDR) is used to describe . The combination of these (BR and EDR) modes in Bluetooth radio technology is classified as a . One master may communicate with up to seven slaves in a piconet.

All devices share the master's clock. Packet exchange is based on the basic clock, defined by the master, which ticks at 3. Two clock ticks make up a slot of 6. In the simple case of single- slot packets the master transmits in even slots and receives in odd slots. The slave, conversely, receives in even slots and transmits in odd slots.

Packets may be 1, 3 or 5 slots long, but in all cases the master's transmission begins in even slots and the slave's in odd slots. The above is valid for . Bluetooth Low Energy, introduced in the 4. Bluetooth low energy#Radio interface. Communication and connection.

The devices can switch roles, by agreement, and the slave can become the master (for example, a headset initiating a connection to a phone necessarily begins as master—as initiator of the connection—but may subsequently operate as slave). Crack For Diablo 2 Expansion Cheats there. The Bluetooth Core Specification provides for the connection of two or more piconets to form a scatternet, in which certain devices simultaneously play the master role in one piconet and the slave role in another. At any given time, data can be transferred between the master and one other device (except for the little- used broadcast mode. The master chooses which slave device to address; typically, it switches rapidly from one device to another in a round- robin fashion. Since it is the master that chooses which slave to address, whereas a slave is (in theory) supposed to listen in each receive slot, being a master is a lighter burden than being a slave.

Being a master of seven slaves is possible; being a slave of more than one master is possible. The specification is vague as to required behavior in scatternets. Class. Max. See the table on the right. Officially Class 3 radios have a range of up to 1 metre (3 ft), Class 2, most commonly found in mobile devices, 1.

Class 1, primarily for industrial use cases,1. Most Bluetooth applications are for indoor conditions, where attenuation of walls and signal fading due to signal reflections make the range far lower than specified line- of- sight ranges of the Bluetooth products. Most Bluetooth applications are battery powered Class 2 devices, with little difference in range whether the other end of the link is a Class 1 or Class 2 device as the lower powered device tends to set the range limit. In some cases the effective range of the data link can be extended when a Class 2 device is connecting to a Class 1 transceiver with both higher sensitivity and transmission power than a typical Class 2 device. Connecting two Class 1 devices with both high sensitivity and high power can allow ranges far in excess of the typical 1.

Some such devices allow open field ranges of up to 1 km and beyond between two similar devices without exceeding legal emission limits. Manufacturers' implementations can be tuned to provide the range needed for each case. These profiles include settings to parameterize and to control the communication from the start. Adherence to profiles saves the time for transmitting the parameters anew before the bi- directional link becomes effective. There are a wide range of Bluetooth profiles that describe many different types of applications or use cases for devices. This was one of the earliest applications to become popular. Idiomatically, a headset is sometimes called .

The protected item has a Bluetooth marker (e. If the connection is broken (the marker is out of range of the phone) then an alarm is raised. This can also be used as a man overboard alarm. A product using this technology has been available since 2. Wi- Fi (IEEE 8. 02. Wi- Fi is intended as a replacement for high speed cabling for general local area network access in work areas or home. This category of applications is sometimes called wireless local area networks (WLAN).

Bluetooth was intended for portable equipment and its applications. The category of applications is outlined as the wireless personal area network (WPAN).

Bluetooth is a replacement for cabling in a variety of personally carried applications in any setting, and also works for fixed location applications such as smart energy functionality in the home (thermostats, etc.). Wi- Fi and Bluetooth are to some extent complementary in their applications and usage. Wi- Fi is usually access point- centered, with an asymmetrical client- server connection with all traffic routed through the access point, while Bluetooth is usually symmetrical, between two Bluetooth devices. Bluetooth serves well in simple applications where two devices need to connect with minimal configuration like a button press, as in headsets and remote controls, while Wi- Fi suits better in applications where some degree of client configuration is possible and high speeds are required, especially for network access through an access node. However, Bluetooth access points do exist and ad- hoc connections are possible with Wi- Fi though not as simply as with Bluetooth.

Wi- Fi Direct was recently developed to add a more Bluetooth- like ad- hoc functionality to Wi- Fi. Bluetooth is commonly used to transfer sound data with telephones (i. Bluetooth headset) or byte data with hand- held computers (transferring files). Bluetooth protocols simplify the discovery and setup of services between devices. While some desktop computers and most recent laptops come with a built- in Bluetooth radio, others require an external adapter, typically in the form of a small USB .

Windows Vista RTM/SP1 with the Feature Pack for Wireless or Windows Vista SP2 work with Bluetooth v. EDR. The Windows XP stack can be replaced by a third party stack that supports more profiles or newer Bluetooth versions. The Windows Vista/Windows 7 Bluetooth stack supports vendor- supplied additional profiles without requiring that the Microsoft stack be replaced. The Blue. Z stack is included with most Linux kernels and was originally developed by Qualcomm.

Its Bluetooth stack has been ported to Open. BSD as well. Specifications and features.

The SIG was formally announced on 2. May 1. 99. 8. Today it has a membership of over 3.

Versions 1. 0 and 1. B also included mandatory Bluetooth hardware device address (BD. The main difference is the introduction of an Enhanced Data Rate (EDR) for faster data transfer.