Bluetooth technology enables communication between

TOEFL, TOEIC, IELTS, FCE, PET, ESP AND VOCABULARY ONLINE EXERCISES

Bluetooth ® technology enables 1______________ communication between 2______________ such as laptop computers, mobile phones and PDAs. Bluetooth® 3______________ devices use short-range radio 4______________ to exchange 5______________ quickly and easily. The technology was 6______________ by a group of computer and 7______________ companies including IBM, Intel, Nokia and Ericsson.

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                  Источник

                  Describe Bluetooth Technology

                  Bluetooth is a wireless technology that enables devices to communicate over short distances. A Bluetooth device can connect up to seven other Bluetooth devices to create a wireless personal-area network (WPAN). This technical specification is described by the

                  Institute of Electrical and Electronics Engineers (IEEE) 802.15.1 standard. Bluetooth devices can handle voice and data and are ideally suited for connecting the following devices:

                  Common Bluetooth characteristics include the following:

                  ■ Bluetooth is a short-range wireless technology designed to eliminate the need for cables between portable and fixed-configuration devices.

                  ■ It operates at 2.4 to 2.485 GHz in the unlicensed Industrial, Scientific, and Medical (ISM) band.

                  ■ It uses little power and has a low cost and a small size.

                  ■ It uses adaptive frequency hopping (AFH).

                  The distance of a Bluetooth personal-area network (PAN) is limited by the amount of power used by the devices in the PAN. Bluetooth devices are broken into three classifications, as shown in Table 13-1. The most common Bluetooth network is Class 2, which has a range of approximately 33 feet (10 m).

                  Maximum Permitted Power (in mW)

                  Bluetooth devices operate in the 2.4- to 2.485-GHz radio frequency range, which is in the ISM band. This band often does not require a license if approved equipment is used. The Bluetooth standard incorporates AFH. AFH allows signals to «hop around» using different frequencies within the Bluetooth range, thereby reducing the chance of interference when multiple Bluetooth devices are present. AFH also allows the device to learn frequencies that are already in use and to choose a different subset of frequencies.

                  Security measures are included in the Bluetooth standard. The first time that a Bluetooth device connects, the device is authenticated using a personal identification number (PIN). Bluetooth supports both 128-bit encryption and PIN authentication.

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                  Readers’ Questions

                  The maximum range of most Bluetooth devices is typically around 30 feet (9 meters). However, some devices can reach up to 300 feet (91 meters) when using Bluetooth 5.0 and higher.

                  1. Low-power wireless communication
                  2. Low cost
                  3. Short range (up to 30 meters)
                  4. Ability to connect multiple devices
                  5. Low interference with other wireless devices

                  Источник

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