Podcast
Questions and Answers
Which of the following is NOT a type of unguided transmission media?
Which of the following is NOT a type of unguided transmission media?
Microwaves require an alignment of the transmitter and receiver antennas for effective communication.
Microwaves require an alignment of the transmitter and receiver antennas for effective communication.
True
What frequencies do radio waves typically operate within?
What frequencies do radio waves typically operate within?
3 kHz to 1 GHz
Infrared waves have a frequency range between _____ and _____ THz.
Infrared waves have a frequency range between _____ and _____ THz.
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Match the following wireless communication types with their characteristics:
Match the following wireless communication types with their characteristics:
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What is a significant disadvantage of Unshielded Twisted Pair (UTP) cables?
What is a significant disadvantage of Unshielded Twisted Pair (UTP) cables?
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Shielded Twisted Pair cables offer faster speeds compared to Optical Fibre Cables.
Shielded Twisted Pair cables offer faster speeds compared to Optical Fibre Cables.
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What technology does Code Division Multiple Access (CDMA) utilize to optimize the use of available bandwidth?
What technology does Code Division Multiple Access (CDMA) utilize to optimize the use of available bandwidth?
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Coaxial cables experience complete disruption due to a single _______.
Coaxial cables experience complete disruption due to a single _______.
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Match the types of wireless communication with their characteristics:
Match the types of wireless communication with their characteristics:
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Study Notes
Wireless Transmission Media
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Radio Waves
- Transmission: Omnidirectional, send in all directions
- Applications: Multicasting data, covering large areas
- Penetration: Can penetrate obstacles like buildings and walls
- Frequency range: 3 kHz to 1 GHz
- Issues: Potential interference from other signals with the same bandwidth or frequency
-
Infrared
- Transmission: Short distance communication only, cannot penetrate barriers
- Frequency range: 300 GHz to 400 THz
- Advantages: High data rates due to larger bandwidth, less interference
- Security: More secure than radio waves
-
Microwaves
- Transmission: Line-of-sight, transmitter and receiver antenna must be aligned
- Suitable for: Shorter distances
- Frequency range: 1 to 400 GHz
- Bandwidth: 1 to 10 Mbps
- Distance: Distance covered is proportional to the height of the antenna
- Types: Terrestrial and satellite microwave transmission
Guided Transmission Media
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Unshielded Twisted Pair (UTP)
- Advantages: Less expensive, easy to install, high-speed
- Disadvantages: Attenuation limits distance, susceptible to external interference
-
Shielded Twisted Pair (STP)
- Advantages: Reduced crosstalk, faster than UTP
- Disadvantages: Bulky, expensive, difficult to install
-
Optical Fiber Cable
- Advantages: Increased bandwidth, immunity to interference
- Disadvantages: High cost, fragile
-
Coaxial Cable
- Advantages: High bandwidth, noise immunity
- Disadvantages: Complete disruption due to single cable failure
Media Access Control (MAC)
- MAC Sublayer: Controls hardware for interaction with wired, optical, or wireless transmission medium
- Part of: Data Link Layer (along with Logical Link Control (LLC))
- LLC: Provides flow control and multiplexing for the logical link (e.g., EtherType, VLAN tag)
- MAC: Provides flow control and multiplexing for the transmission medium
Code Division Multiple Access (CDMA)
- Protocol: Used in 2G and 3G wireless communication
- Multiplexing: Allows multiple signals on a single transmission channel, optimizing bandwidth
- Technology: Utilizes spread spectrum technology to transmit signals
- Frequency Bands: Used in 800 MHz and 1.9 GHz bands for cellular phone systems
Twisted Pair Cable
- Construction: Two insulated conductors twisted together
- Purpose: Improves electromagnetic compatibility, reduces interference
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Types
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Unshielded Twisted Pair (UTP)
- No physical shield
- Affordable, easy to set up
- High-speed link
-
Shielded Twisted Pair (STP)
- Foil shield to block external interference
- Higher data transmission rate
- Used in fast-data-rate Ethernet and telephony
-
Unshielded Twisted Pair (UTP)
Optical Fiber Cable
- Construction: Thin strands of glass that guide light
- Applications: Long-distance communication
- Advantages: High data capacity, long distances without repeaters, low maintenance costs
- Types: Unidirectional and bidirectional
Coaxial Cable
- Construction: Two parallel conductors insulated separately with an insulation layer
- Signal Transmission: Baseband and broadband modes
- Advantages: High-frequency signal transmission without significant loss
- Importance: Controlled dimensions and spacing for efficient transmission
Unguided Transmission Media
- Also known as: Unbounded, wireless media
- Transmission: Electromagnetic signals without a physical medium
- Medium: Air
- No physical connection: Between transmitter and receiver
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Description
Test your knowledge on various wireless transmission media including radio waves, infrared, and microwaves. Explore their unique characteristics, applications, and frequency ranges. Understand the advantages and limitations of each type in real-world scenarios.
