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Questions and Answers
Which three types of media are most commonly used for communication?
Which three types of media are most commonly used for communication?
- Wireless networks, archived data, and infrared
- Coaxial cables, electrical signals, and light waves
- Radio waves, telephone lines, and optical fibers (correct)
- Fiber optics, digital satellites, and microwave
What is the main function of a transceiver in a communication system?
What is the main function of a transceiver in a communication system?
- To filter out undesirable interference from the signal
- To recover the original information from the received signal
- To convert and transmit signals through a specified medium (correct)
- To amplify the original information signal before transmission
What is another term frequently used to refer to a communication medium?
What is another term frequently used to refer to a communication medium?
- Signal conduit
- Transmission channel (correct)
- Information pathway
- Data corridor
What phenomenon describes undesirable interference added to a signal during transmission?
What phenomenon describes undesirable interference added to a signal during transmission?
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How can a communication medium negatively impact a signal?
How can a communication medium negatively impact a signal?
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Study Notes
Electronic Communication
- Began in the 19th century.
Elements of Communication System
- Four main elements:
- Information Source: Originates the message.
- Transmitter: Converts message into a signal.
- Communication Medium: Pathway for the signal transmission.
- Receiver: Converts the signal back into the original message.
- Diagram illustrating relationship: Information Source → Transmitter → Communication Medium → Receiver.
Types of Media Used for Communication
- Five types of media include:
- Wired: Cables like coaxial and fiber optics.
- Wireless: Radio waves, microwaves.
- Optical: Light-based methods.
- Satellite: Uses satellites for transmission.
- Internet: Digital transmission through various protocols.
- Three most commonly used: Wired, Wireless, Internet.
Signal Conversion Device
- The device used to convert an information signal to a compatible signal is called a modem (modulator-demodulator).
Signal Recovery Equipment
- Demodulator: Acquires a signal from a communication medium and recovers the original information signal.
Transceiver Definition
- A transceiver is a device that can both transmit and receive signals.
Effects of Communication Medium on Signal
- Two ways a communication medium can affect a signal:
- Attenuation: Reduction in signal strength over distance.
- Distortion: Alteration in the signal waveform as it travels.
Alternative Name for Communication Medium
- Another name for a communication medium is transmission medium.
Undesirable Interference
- Undesirable interference added to a transmitted signal is referred to as noise.
Common Sources of Interference
- Three common sources of interference include:
- Electromagnetic Interference (EMI): Caused by electrical devices.
- Radio Frequency Interference (RFI): Caused by radio signals.
- Crosstalk: Interference from adjacent communication lines.
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