Data Communication Channels Quiz

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Questions and Answers

Which of the following is an example of a point-to-multipoint communication channel?

Optical fibers (correct)
Computer buses
Storage media
Copper wires

What type of signal is used to represent data in analog transmission?

Digital modulation signal
Pulse code modulation signal
Continuous signal varying in amplitude or phase (correct)
Discrete signal varying in frequency

Which method is used for passband modulation and demodulation?

Pulse sequence representation
Modem equipment (correct)
Line code
Continuously varying waveforms

According to the most common definition of digital signal, what is considered as digital transmission?

$Both$ baseband and passband signals representing bit-streams (D) Signup and view all the answers

What is the main difference between analog transmission and digital communication?

Analog transmission involves continuously varying analog signals, while digital communication involves discrete messages. (D) Signup and view all the answers

What does passband modulation and demodulation refer to?

Passband modulation and demodulation refer to the process of modulating and demodulating signals for transmission over analog channels. (B) Signup and view all the answers

How is serial transmission different from parallel transmission?

Serial transmission sends bits sequentially, while parallel transmission sends bits simultaneously over multiple paths. (B) Signup and view all the answers

What is a key advantage of synchronous data transmission?

Synchronous data transmission synchronizes transmission speeds at both ends using clock signals. (C) Signup and view all the answers

5

Digital serial transmissions are bits sent over a single wire, frequency or optical path sequentially. (A) Signup and view all the answers

What is the purpose of check digit or parity bit in serial data transmissions?

To detect errors in transmitted data (A) Signup and view all the answers

What does asynchronous serial communication use to signify the beginning and end of transmissions?

Start and stop bits (B) Signup and view all the answers

What does parallel data transmission use multiple electrical wires for?

To transmit multiple bits simultaneously (B) Signup and view all the answers

What type of communication uses baseband and passband signals representing bit-streams as digital transmissions?

Digital communication (B) Signup and view all the answers

Which type of modulation method involves a limited set of continuously varying waveforms?

Passband modulation (A) Signup and view all the answers

What does source coding and decoding refer to in digital communication?

The process of encoding and decoding analog signals into a bit-stream (B) Signup and view all the answers

Which layer of the OSI model covers data transmission principles?

Physical layer (A) Signup and view all the answers

What is the main difference between digital transmission and analog transmission?

Digital transmission uses digitized signals, while analog transmission uses non-digitized signals. (B) Signup and view all the answers

Which code was the first practical error correction code, introduced in 1952?

Barker code (C) Signup and view all the answers

What are the advantages of digital communication over analog communication?

Error detection and correction, simpler multiplexing, and greater signal processing capability (D) Signup and view all the answers

In which model are data transmission principles covered along with information theory and coding theory?

$OSI$ model (D) Signup and view all the answers

What type of signal does analog transmission refer to?

Non-digitized signal transmission (C) Signup and view all the answers

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Study Notes

Data transmission involves the transfer of digital messages or analog signals as bit-streams, carried out using codec equipment.
Digital transmission is a telecommunications and electrical engineering topic, while data communications in computer science includes network applications and protocols.
Analog transmission refers to non-digitized signal transmission, either baseband or passband, or passband transmission using digital modulation methods.
Data transmission principles are covered by information theory and coding theory, and dealt with in the OSI model's data link, physical, and transport layers.
Data transmission history includes non-electronic methods, telegraphy, and telephony, with fundamental theoretical work in the early 20th century.
Data transmission is used in computers for buses and peripheral communication, and in storage media for error detection and correction.
First practical error correction code was the Barker code in 1952, and data transmission is utilized in computer networking, telephone networks, and digital communication systems like ISDN and broadband access.
Digital communication offers advantages like error detection and correction, simpler multiplexing, and greater signal processing capability, leading to quick growth in digital communications and various applications like cellular telephony, video conferencing, and digital media.

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