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    Transmission medium

    Transmission medium

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    This article is about transmission of signals. For biological transmission, see Vector (molecular biology).

    Cutaway diagram of Coaxial cable, one example of a transmission medium

    A transmission medium is a system or substance that can mediate the propagation of signals for the purposes of telecommunication. Signals are typically imposed on a wave of some kind suitable for the chosen medium. For example, data can modulate sound, and a transmission medium for sounds may be air, but solids and liquids may also act as the transmission medium. Vacuum or air constitutes a good transmission medium for electromagnetic waves such as light and radio waves. While material substance is not required for electromagnetic waves to propagate, such waves are usually affected by the transmission media they pass through, for instance, by absorption or reflection or refraction at the interfaces between media. Technical devices can therefore be employed to transmit or guide waves. Thus, an optical fiber or a copper cable is used as transmission media.

    Electromagnetic radiation can be transmitted through an optical medium, such as optical fiber, or through twisted pair wires, coaxial cable, or dielectric-slab waveguides. It may also pass through any physical material that is transparent to the specific wavelength, such as water, air, glass, or concrete. Sound is, by definition, the vibration of matter, so it requires a physical medium for transmission, as do other kinds of mechanical waves and heat energy. Historically, science incorporated various aether theories to explain the transmission medium. However, it is now known that electromagnetic waves do not require a physical transmission medium, and so can travel through the "vacuum" of free space. Regions of the insulative vacuum can become conductive for electrical conduction through the presence of free electrons, holes, or ions.

    Contents

    1 Optical medium

    2 Telecommunications

    3 Simplex versus duplex

    4 Types 4.1 Guided media 4.1.1 Twisted pair 4.1.2 Coaxial cable 4.1.3 Optical fiber 4.2 Unguided media 4.2.1 Radio 5 Digital encoding 6 See also 7 References

    Optical medium[edit]

    This section is an excerpt from Optical medium.[edit]

    An optical medium is material through which light and other electromagnetic waves propagate. It is a form of transmission medium. The permittivity and permeability of the medium define how electromagnetic waves propagate in it.

    Telecommunications[edit]

    A physical medium in data communications is the transmission path over which a signal propagates. Many different types of transmission media are used as communications channel.

    In many cases, communication is in the form of electromagnetic waves. With guided transmission media, the waves are guided along a physical path; examples of guided media include phone lines, twisted pair cables, coaxial cables, and optical fibers. Unguided transmission media are methods that allow the transmission of data without the use of physical means to define the path it takes. Examples of this include microwave, radio or infrared. Unguided media provide a means for transmitting electromagnetic waves but do not guide them; examples are propagation through air, vacuum and seawater.

    The term direct link is used to refer to the transmission path between two devices in which signals propagate directly from transmitters to receivers with no intermediate devices, other than amplifiers or repeaters used to increase signal strength. This term can apply to both guided and unguided media.

    Simplex versus duplex[edit]

    A transmission may be simplex, half-duplex, or full-duplex.

    In simplex transmission, signals are transmitted in only one direction; one station is a transmitter and the other is the receiver. In the half-duplex operation, both stations may transmit, but only one at a time. In full-duplex operation, both stations may transmit simultaneously. In the latter case, the medium is carrying signals in both directions at the same time.

    Types[edit]

    In general, a transmission medium can be classified as

    , if different waves at any particular point in the medium can be superposed;

    , if it is finite in extent, otherwise ;

    or , if its physical properties are unchanged at different points;

    , if its physical properties are the same in different directions.

    There are two main types of transmission media:

    —waves are guided along a solid medium such as a transmission line;

    —transmission and reception are achieved by means of an antenna.

    One of the most common physical medias used in networking is copper wire. Copper wire to carry signals to long distances using relatively low amounts of power. The unshielded twisted pair (UTP) is eight strands of copper wire, organized into four pairs.[1]

    Guided media[edit]

    Twisted pair[edit]

    Main article: Twisted pair

    cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced pair, a twisted pair reduces electromagnetic radiation from the pair and crosstalk between neighboring pairs and improves rejection of external electromagnetic interference. It was invented by Alexander Graham Bell.[2]

    स्रोत : en.wikipedia.org

    [Solved] Which of the following is the medium of transmission of info

    Radio Transmission : The mode of communication which uses the radio wave to transmit or send information. Radio waves are operated at very high frequency henc

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    Which of the following is the medium of transmission of information in radio transmission?

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    SSC Scientific Assistant Electronics 23 Nov 2017 (Shift 1) Official Paper

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    An antenna Co-axial cable Space Optical Fiber

    Answer (Detailed Solution Below)

    Option 3 : Space

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    Radio Transmission :

    The mode of communication which uses the radio wave to transmit or send information.

    Radio waves are operated at very high frequency hence capable of travelling long distances.

    Radio wave propagation is called space wave propagation.

    The transmission is takes place in air / space /vacuum hence medium of transmission is space.

    The transmitter sends signals through space in the form of radio waves.

    Hence correct option is "3".

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    In radio transmission the medium of transmission is

    In radio transmission, the medium of transmission is ___________ a) Space b) An antenna c) Cable d) None of the above

    In radio transmission the medium of transmission is

    Home / Electrical Engineering / Modulation And Demodulation / Question

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    In radio transmission, the medium of transmission is ___________

    A. Space B. An antenna C. Cable

    D. None of the above

    Answer: Option A

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