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    in bluetooth which of the following device decides hopping sequence

    Mohammed

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    get in bluetooth which of the following device decides hopping sequence from screen.

    Answer 2 Q13 In Bluetooth which of the following device decides the hopping

    Answer 2 Q13 In Bluetooth which of the following device decides the hopping from COMPUTER 603 at Lucknow University

    MOBILE COMPUTING MCQs SET -I Q1. Which of the following stores all the user-related data that is relevant for the GSM system in mobile

    DOC PREVIEW Pages 28 Total views 8 Lucknow University

    CorporalChimpanzeePerson641

    09/10/2022

    Answer 2Q13. In Bluetooth which of the following device decides the hoppingsequence?1.Master2.Parked3.Standby4.Slave

    Answer 1

    Q14. In which of the following the total available bandwidth is split intomany channels of smaller bandwidth plus guard spaces between thechannels?

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    Answer 1Q15. In which of the following a single data stream is split across severalseparate narrowband channels at different frequencies to reduceinterference and crosstalk.

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    Answer 1Q16. Which of the following uses high-frequency radio waves instead ofcables for connecting the devices in LAN?

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    Answer 2Q17. Most WLANs are based upon the standard—-

    1.IEEE 802.22.IEEE 802.113.IEEE 802.54.IEEE 802.15

    Answer 2Q18. Which of the following is/are the advantages of a wireless LAN?

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    Answer 4Q19. Disadvantages of WLANs include —–

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    Answer 4Q20. In piconet devices connected with the master is called

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    Q21 The general goal of a file system is to support———-1.Transparent access to data2.Efficient access to data3.Consistent access to data4.All of the aboveAnswer 4

    Q 22 In the distributed system a client gives the request, and the serverprovides—-

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    Q 23. The important challenges of distributed systems apply to DFS are——

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    Q24. Features of CODA is/are

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    4.All of the aboveAnswer 4

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    स्रोत : www.coursehero.com

    What is Bluetooth frequency hopping?

    Answer (1 of 3): Bluetooth Devices are radio frequency devices designed to use the 2.4 to 2.48 GHz frequency band known as the ISM band. Bluetooth devices share this band with other devices such as wireless networks (802.11) and cordless phones. Bluetooth devices use frequency hopping to help min...

    What is Bluetooth frequency hopping?

    Sort Umer Hayyat

    Faisalabad (2018–present)1y

    Bluetooth Devices are radio frequency devices designed to use the 2.4 to 2.48 GHz frequency band known as the ISM band. Bluetooth devices share this band with other devices such as wireless networks (802.11) and cordless phones. Bluetooth devices use frequency hopping to help minimize the effects of interference with other devices. Frequency Hopping is a technique where when a link is formed the devices are synchronized to change channels together many times a second. The pattern of channels used is called the hop sequence and is unique for each link. Since the devices spend only small amounts

    Related questions

    Why is frequency hopping used in Bluetooth?

    Wireless Technology: Both WiFi & Bluetooth use the 2.4ghz frequency, then why they have different ranges?

    What is bluetooth radio?

    What are the types of frequency hopping?

    What does frequency hopping mean?

    Kurt Behnke

    Former Telecom R&D and Manager Operations at Ericsson (company) (1997–2017)Author has 6K answers and 8.5M answer views1y

    It is called Frequency Hopping Spread Spectrum (FHSS). In a Bluetooth piconet at any moment in time transmission happens on a single1 MHz sub-band of 80 such bands. The active band changes 1,600 times per second, led by the master node. This hopping procedure avoids persistent disturbances which often are restricted to frequency ranges.

    An alternative spread spectrum technology is Direct spread spectrum (DSSS) which uses CDMA to balance the disturbed areas. FHSS and DSSS don’t coexist well. Originally WLAN 802.11 was designed with DSSS. Later versions of WLAN changed to OFDM to allow coexistenc

    Swapan Kr. Mukherjee

    Graduates in Trending Topics (online) & Internet of Things (IoT), The University of Burdwan (Graduated 2002)Author has 129 answers and 80.1K answer views1y

    In environments where other wireless technologies are in use, devices communicating through Bluetooth wireless technology run the risk of causing and experiencing interference.

    The most important examples of such innovations are wireless LANs and other applications focused on the IEEE 802.11 standard. These use the same 2.4 GHz unlicensed ISM (Industrial, Scientific, and Medical) radio band as Bluetooth.

    Tami Stone

    Author has 1.3K answers and 279.9K answer views1y

    Related

    Why is frequency hopping used in Bluetooth?

    Frequency hopping is used so multiple devices can occupy the same spectrum bandwidth without dwelling on a particular frequency for any real length of time. This limits collisions and unintentional jamming or interception between devices.

    Tom Crosley

    Embedded systems programmer for 45 yearsAuthor has 2.6K answers and 23.4M answer views3y

    Related

    Why do Bluetooth and Wifi use the same frequencies?

    Both Wi-Fi and Bluetooth use portions of the ISM

    (industrial, scientific and medical) radio bands. As the name implies, they were initially reserved internationally for the use of radio frequency (RF) energy for industrial, scientific and medical purposes other than telecommunications. Examples of applications in these bands include radio-frequency process heating, microwave ovens, and medical diathermy machines.

    The powerful emissions of these devices can create electromagnetic interference and disrupt radio communication using the same frequency, so these devices were limited to certain bands

    Ryan Bartling

    3 years working on spread spectrum applications and technologies at various comp6y

    Related

    What does frequency hopping mean?

    Put simply, it means that your radio or other signal is changing carrier frequencies. It’s typically done in a systematic way, such that you and the other users on the radio change from say 99MHz to 105MHz to 85 MHz at the same time.

    The technique was first patented

    [1] by Hedy Lamarr, an actress, who left Germany as the Nazi’s came to power. It was intended to allow to allow naval vessels to remotely guide torpedoes over radio without the enemy being able to jam or otherwise interfere with the torpedo guidance. In her patent, she used the mechanism from a player piano to control what frequency wa

    Footnotes [1] Patent Images Christoph Marschall

    Working behind the scenes of telecomAuthor has 747 answers and 3.5M answer views7y

    Related

    Why did Bluetooth use frequency-hopping and not the direct-sequence spread spectrum technique?

    Originally Answered: Why did Bluetooth use frequency-hopping and not direct-sequence spread spectrum technique?

    Because the focus of Bluetooth was to be as low-power as possible, and FHSS is less complex and thus less power-demanding than DSSS.

    Simply put, frequency hopping requires the transmitter to just switch transmission channels frequently, while direct-spectrum requires processing of the actual output signal into a carrier signal ("noise") before it is transmitted.

    Alfredo Torrejon

    Author has 3.2K answers and 2.3M answer views2y

    Related

    How has frequency hopping been used to help with communication?

    The original purpose of frequency hopping was to make it more difficult to intercept or to jam radio communications. Frequency hopping is considered a type of spread spectrum communication.

    Another more subtle example of how frequency hopping has helped with communications is related to the FCC’s rules concerning unlicensed devices, such as cordless telephones. These rules allow cordless phones employing spread spectrum technology to use much higher transmit powers than older FM cordless telephones. Hence, the newer phones can have much better range and less susceptibility to signal drop-outs.

    स्रोत : www.quora.com

    Masters and Slaves: Roles in a Bluetooth Piconet

    To understand how the master-slave switch works, you must first understand the roles of master and slave in a Bluetooth piconet. To understand that, you have to know about Bluetooth frequency hopping. Jennifer Bray takes a look at that topic here.

    Masters and Slaves: Roles in a Bluetooth Piconet

    May 11, 2001 📄 Contents ␡

    Frequency-Hopping Spread Spectrum

    Masters, Slaves, and Piconets

    Scatternets and Speed

    Why LAN Access Points' Roles Change

    Preparing for the Switch

    A Matter of Timing Making the Switch After the Switch

    ⎙ Print + Share This

    Page 1 >

    To understand how the master-slave switch works, you must first understand the roles of master and slave in a Bluetooth piconet. To understand that, you have to know about Bluetooth frequency hopping. Jennifer Bray takes a look at that topic here.

    Frequency-Hopping Spread Spectrum

    Bluetooth uses the Industrial Scientific and Medical (ISM) band, which is free to use in most countries. The regulators expect lots of devices to be using the same spectrum, so they have set out rules for using ISM bandwidth to make sure that devices can share the bandwidth. The rules state that you must spread the power of your transmissions across the ISM band somehow. Two main methods are used for spreading out the power: direct sequence spread spectrum (DSSS) and frequency-hopping spread spectrum.

    Direct sequence spread spectrum smears a transmission across a wide range of frequencies at low power. Frequency-hopping spread spectrum uses a small bandwidth but changes (or hops) frequency after each packet.

    Bluetooth uses frequency-hopping spread spectrum. There are 79 channels of 1MHz each; after each transmit or receive, devices hop to a new channel. Figure

    1 shows a recording from a Tektonix WCA380 spectrum analyzer. This shows how many Bluetooth piconets can share the ISM band. Occasionally, two piconets may collide on the same channel, but they will just hop off to new frequencies and retransmit any data that was lost.

    Figure 1

    Page 1 >

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