ITT300 Chapter 6: Transmission Media
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Questions and Answers

What happens to light when it transitions between substances with different speeds?

  • It passes straight through without change.
  • It reflects off the surface.
  • It bends due to refraction. (correct)
  • It increases in speed instantly.

    • What is the critical angle in relation to the refracted angle?

  • The angle where light is completely absorbed.
  • The angle where reflection no longer occurs.
  • The angle at which light begins to refract.
  • The angle where the refracted angle is 90 degrees. (correct)

    • Which phenomenon occurs when the incident angle exceeds the critical angle?

  • Critical refraction
  • Total internal reflection (correct)
  • Partial refraction
  • Dispersion of light

    • What is the function of cladding in an optical fiber?

    <p>To reflect light back into the core.</p> Signup and view all the answers

    In what configuration are fiber-optic cables often used?

    <p>Bus topology</p> Signup and view all the answers

    Which statement accurately describes MT-RJ connectors?

    <p>They are the same size as RJ45 connectors.</p> Signup and view all the answers

    What is the primary characteristic of an omni-directional antenna?

    <p>It sends signals out in multiple directions.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of microwave frequencies?

    <p>They can penetrate walls effectively.</p> Signup and view all the answers

    What is the primary function of a transmission medium?

    <p>To carry information from one point to another</p> Signup and view all the answers

    What is required for long-distance microwave communication?

    <p>Repeaters placed strategically.</p> Signup and view all the answers

    What is the function of a parabolic antenna?

    <p>To catch a wide range of waves and direct them to a common point.</p> Signup and view all the answers

    Which type of transmission media uses a physical conductor?

    <p>Guided media only</p> Signup and view all the answers

    Which of the following is not an example of guided transmission media?

    <p>Radiowave</p> Signup and view all the answers

    Which statement about wireless communication is true?

    <p>Both AM and FM radio utilize omni-directional antennas.</p> Signup and view all the answers

    What form of signal does fiber optic cable transmit?

    <p>Light</p> Signup and view all the answers

    For microwave communication, what is essential regarding the location of antennas?

    <p>They must have a clear line of sight to each other.</p> Signup and view all the answers

    What distinguishes guided media from unguided media?

    <p>Guided media has physical limitations that contain the signal</p> Signup and view all the answers

    What unique advantage does an omni-directional antenna offer?

    <p>Ability to multicast effectively to many receivers.</p> Signup and view all the answers

    Twisted pair cable consists of how many conductors?

    <p>Two conductors</p> Signup and view all the answers

    Which of the following statements regarding antenna types is correct?

    <p>Directional antennas are useful for long-distance communication but require precise alignment.</p> Signup and view all the answers

    What defines the operational range of infrared communication?

    <p>Limited to line of sight between devices.</p> Signup and view all the answers

    Which of the following is an example of unguided transmission media?

    <p>Microwave</p> Signup and view all the answers

    Which characteristics of infrared waves limit their use in outdoor communication?

    <p>Interference from natural sunlight.</p> Signup and view all the answers

    What material is primarily used in coaxial cables to transport signals?

    <p>Copper</p> Signup and view all the answers

    What is an example of a device that commonly uses infrared communication?

    <p>Wireless keyboard.</p> Signup and view all the answers

    What is the operating frequency range for infrared communication?

    <p>300GHz to 400THz.</p> Signup and view all the answers

    What describes guided transmission media?

    <p>Requires a physical conduit between devices.</p> Signup and view all the answers

    Which of the following is a disadvantage of infrared communication?

    <p>Limited range due to obstacles.</p> Signup and view all the answers

    Which antenna type is described as a gigantic scoop for collecting transmissions?

    <p>Horn antenna.</p> Signup and view all the answers

    Which statement is true regarding unguided media?

    <p>Utilizes electromagnetic waves without physical conductors.</p> Signup and view all the answers

    What is the primary characteristic of very high frequency signals in terms of transmission?

    <p>They are transmitted in a straight line from antenna to antenna.</p> Signup and view all the answers

    Which frequency band is associated with long-range radio navigation?

    <p>VLF (3–30 KHz)</p> Signup and view all the answers

    What propagation method must the antennas use when communicating within the UHF band?

    <p>Line-of-sight propagation</p> Signup and view all the answers

    Which band is primarily used for AM radio broadcasting?

    <p>MF</p> Signup and view all the answers

    What is the frequency range that defines the SHF band?

    <p>3–30 GHz</p> Signup and view all the answers

    For what frequency range are radio waves defined in your content?

    <p>3 KHz to 1 GHz</p> Signup and view all the answers

    Which application corresponds with the UHF band?

    <p>Cellular phones</p> Signup and view all the answers

    What is the significance of line-of-sight in propagation types?

    <p>It requires that antennas must face directly toward each other.</p> Signup and view all the answers

    Study Notes

    Learning Outcomes

    • Identify types of transmission media used for data transmission.
    • Differentiate between guided (wired) and unguided (wireless) transmission media.
    • Understand characteristics of each transmission medium.

    Transmission Media

    • Defined as anything that carries information, such as air, vacuum, water, UTP cable, and fiber optic.
    • Data transmitted as signals converted from digital to digital signals or analog signals.

    Types of Transmission Media

    • Guided (Wired):

      • Twisted Pair Cable: Two insulated conductors twisted together.
      • Coaxial Cable: Conductor surrounded by insulation and an outer shield.
      • Fiber Optic Cable: Uses glass or plastic to transmit signals as light.

    • Unguided (Wireless):

      • Free Space: Utilizes microwaves, radio waves, and satellite communications.

    Guided Media Characteristics

    • Requires a physical conductor for signal transmission.
    • Signals remain contained within the physical limits of the media.
    • Twisted pair and coaxial cables transmit electrical signals, while fiber optics use light.

    Guided Media Phenomena

    • Refraction: Light changes direction when passing from one medium to another due to a change in speed.
    • Reflection: Occurs when light hits a boundary at a critical angle, allowing it to be guided through the medium; essential in optical fiber design.

    Fiber-Optic Cable

    • Connectors like MT-RJ are commercially available.
    • Commonly used in backbone networks and cost-effective for certain applications due to high bandwidth.

    Propagation Types

    • Line of sight: Communication relies on direct visual alignment between antennas.

    Radio Waves

    • Frequency range of 3 kHz to 1 GHz.
    • Omnidirectional antennas allow signals to be transmitted in all directions, facilitating multicasting.
    • Common applications include AM & FM radio, television, and cordless phones.

    Microwave Communication

    • Frequencies between 1 to 300 GHz; requires highly focused unidirectional antennas.
    • Communication must occur with aligned sending and receiving antennas, necessitating direct line of sight.
    • Applications include cellular networks and satellite communication.

    Infrared Communication

    • Frequencies between 300 GHz to 400 THz; effective for short-range communication.
    • Cannot penetrate walls, limiting usage to indoor environments.
    • Commonly used in devices like wireless keyboards and printers, requiring direct line of sight for transmission.

    Summary of Transmission Media

    • Transmission media lies below the physical layer in network architecture.
    • Guided media facilitates direct interactions between devices, while unguided media uses electromagnetic waves without a physical connection.
    • Each type of transmission medium has distinct characteristics, advantages, and limitations.

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    Related Documents

    ITT300 - Chapter 6 Transmission Media - St. PDF

    Description

    This quiz covers Chapter 6 of ITT300, focusing on different types of transmission media used in data communication and networking. It explores guided and unguided transmission media, including their characteristics and applications. Test your understanding and knowledge of the fundamental concepts related to transmission media.

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