Data transmission

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  • First Phone Data Communication

    first phone data communication was invented by Alexander Graham Bell in 1874-1876. But the very first person to be able to convey sounds over a taut extended wire by mechanical vibrations was Robert Hooke in 1667 so it’s the culmination of work done by many individuals until Alexander Graham Bell created a telephone. The earlier development is when sound waves are carried as mechanical vibrations along the string or wire from one diaphragm to the other. A very good example is the tin can telephone. In 1876, Alexander Graham Bell used what he called a ‘liquid transmitter’. When Bell shouted into the open end of the cone, his voice made the parchment vibrate, so the needle moved slightly in relation to a contact in the cup.…

    Words: 1249 - Pages: 5
  • Layers Of WBAN

    channel, activation and deactivation of radio transceiver, data transmission and reception are the tasks that is done by the physical layer. There are different physical layers. The choice of physical layer depends on the applications. The different physical layers are: Narrow Band (NB), Human Body Communication (HBC) and Ultra Wide Band (UWB). NB physical layer is used for the activation or deactivation of the radio transceiver and data transmission and reception. The PSDU (Physical Layer…

    Words: 954 - Pages: 4
  • Modem Essay

    SDSL providing equal download/upload speeds. SDSL are more common for businesses that require the use of higher bandwidth and downloading/uploading speeds. ● Sat Modem (Satellite Modem) - These are the least common types of modems, and they primarily convert digital information with the use of radio waves to communicate with a satellite dish. These types of modems are most helpful for businesses and consumers who are located in rural areas. Of the types of modems listed and explained above,…

    Words: 1334 - Pages: 6
  • Advantages And Disadvantages Of Code-Division Multiple Access (CDMA)

    channel. CDMA is a form of multiplexing which allows many signals to occupy a transmission channel and optimizing the use of available bandwidth. Therefore, the receiver separates the signals from the users by cross correlation of the received signal with each of the user unique code sequences. If the code sequence is designed to have a small cross correlation, it can minimize the crosstalk inherent. There is a spreading signal in code-division multiple access (CDMA) systems…

    Words: 1451 - Pages: 6
  • Essay On Advantages And Disadvantages Of OFDM

    channel does not overlap with the signal from an adjacent one. because of scarcity of digital filters it was very difficult to filter closely packed adjacent channels. 2.Multicarrier modulation:- it is not convenient and efficient to transfer a high rate data stream through a channel, the signal is divided into a number of signals over that frequency range. Each of these signals are individually modulated and transmitted over the…

    Words: 1529 - Pages: 7
  • Unit Standard 6852 Unit 2 Different Communication Mediums

    Unit Standard 6852 Assessment Task 1: Throughout history, cable types have changed quite a lot, whether is be for reasons based on speed - or security. The most common one that is usually referred to as “ethernet cable” today is CAT cabling. The generic blue cable that end users recognise as their internet service - this has become one of the most developed cable types in IT history. From CAT3 to CAT7, many improvements have been made to improve the quality of the cabling, such as giving it a…

    Words: 993 - Pages: 4
  • Three Color Red Analysis

    Three Colors: Red Questions 1. Throughout “Three Colors: Red” many themes were explored in this feature film. For instance, the first one we see appear in the film multiple times includes the technology aspect of using a telephone. When the movie opens up Michel makes a phone call to Valentine. As we hear the phone ringing we follow the phone line, which goes from the wire in his room, down the apartment, into the ocean, through a tunnel, then the message gets sent to Valentine who is living…

    Words: 1424 - Pages: 6
  • 3g Mobile Case Study

    present in telecom with the guide of? i video calling too possible. New organizations and progressions learn through transparent the front line exertion and client longing to increment and contention in the middle of manager and administration supplier additionally increment. Interestingly radio transmission phone gift in 1857, Clark Maxwell closed speculation of electromagnetic radiation, which Marconi utilized as a reason for the making of a radio transmission in 1901. This…

    Words: 1199 - Pages: 5
  • Stepper Motor Reflection

    Motor & Gearbox The mirrors are required to rotate specific angles. To be able to achieve specific angles we need a stepper motor. The stepper motor is known to divide one revolution into equal steps which is our main requirements for the rotation of the mirrors. Figure ‎2-13: The Stepper Motor The following table shows the stepper motor specifications: Table ‎2-1: Stepper Motor Specifications Current 4.2 A Angle 1.8° Torque 8.34 N.m The desired torque calculated to withstand the mirror…

    Words: 1686 - Pages: 7
  • Advantage And Disadvantage Of Zeroshift

     The Zeroshift concept is to remove the synchromesh components within a manual transmission and replace them with Zeroshift rings, Figure 1. Synchronization is performed externally with the assistance of torque intervention performed by the engine control unit and an automated clutch (standard equipment in an AMT).  The Zeroshift rings act as a pair and represent a dog engagement type transmission. The unacceptable backlash found in dog engagement transmissions is eliminated by splitting the…

    Words: 1758 - Pages: 8
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