Types and methods of data transmission
Cambridge IGCSE Computer Science (0478) · Unit 2: Data transmission · 10 flashcards
Types and methods of data transmission is topic 2.1 in the Cambridge IGCSE Computer Science (0478) syllabus , positioned in Unit 2 — Data transmission , alongside Error detection and correction and Encryption. In one line: Serial transmission sends data one bit at a time over a single wire, while parallel transmission sends multiple bits simultaneously over multiple wires. Parallel is faster over short distances but more susceptible to interference.
This topic is examined in Paper 1 (computer systems theory) and Paper 2 (algorithms, programming and logic).
The deck below contains 10 flashcards — 7 definitions, 1 key concept and 2 application cards — covering the precise wording mark schemes reward. Use the 7 definition cards to lock down command-word answers (define, state), then move on to the concept and application cards to handle explain, describe and compare questions.
Explain the difference between serial and parallel data transmission
Serial transmission sends data one bit at a time over a single wire, while parallel transmission sends multiple bits simultaneously over multiple wires. Parallel is faster over short distances but more susceptible to interference.
What the Cambridge 0478 syllabus says
Official 2026-2028 specThese are the exact learning objectives Cambridge sets for this topic. Match the command word (Describe, Explain, State, etc.) in your answer to score full marks.
- Understand Understand that data is broken down into packets to be transmitted
- Describe Describe the structure of a packet including packet header, payload and trailer
- Describe Describe the process of packet switching
- Describe Describe how data is transmitted from one device to another using different methods of data transmission including serial, parallel, simplex, half-duplex, full-duplex
- Explain Explain the suitability of each method of data transmission for a given scenario
- Understand Understand the universal serial bus (USB) interface and explain how it is used to transmit data
Explain the difference between serial and parallel data transmission.
Serial transmission sends data one bit at a time over a single wire, while parallel transmission sends multiple bits simultaneously over multiple wires. Parallel is faster over short distances but more susceptible to interference.
Describe a scenario where simplex data transmission would be appropriate.
Simplex transmission is one-way communication. An example is a radio broadcast, where the station transmits signals to listeners but does not receive signals back from them.
Distinguish between half-duplex and full-duplex data transmission.
Half-duplex allows data transmission in both directions, but only one direction at a time (like a walkie-talkie). Full-duplex allows simultaneous two-way communication (like a telephone).
What is the key characteristic of synchronous data transmission?
Synchronous transmission involves sending data in a continuous stream with a clock signal to synchronize the sender and receiver. This ensures accurate timing and data interpretation.
How does asynchronous data transmission differ from synchronous transmission?
Asynchronous transmission uses start and stop bits to indicate the beginning and end of each data unit, removing the need for a constant clock signal. It's simpler but less efficient.
Define 'bit rate' in the context of data transmission.
Bit rate refers to the number of bits transmitted per second, usually measured in bits per second (bps) or kilobits per second (kbps). A higher bit rate indicates a faster data transfer speed.
Explain the concept of 'bandwidth' in data transmission.
Bandwidth is the range of frequencies available for data transmission. A wider bandwidth allows for a higher data transfer rate and greater capacity for information.
What is 'latency' and how does it impact data transmission?
Latency is the delay or time it takes for a data packet to travel from its source to its destination. High latency can result in delays and slow performance in real-time applications.
Give an example of when full-duplex data transmission would be preferred over half-duplex transmission.
Video conferencing requires real-time simultaneous sending and receiving of audio and video data. Full-duplex communication ensures smoother and more natural interaction than half-duplex.
Explain how bit rate and bandwidth are related.
Bit rate is directly related to bandwidth; a larger bandwidth will allow for a higher bit rate. The bandwidth represents the capacity of the transmission medium, and the bit rate is the speed at which data can be sent through that capacity.
Key Questions: Types and methods of data transmission
Explain the difference between serial and parallel data transmission.
Serial transmission sends data one bit at a time over a single wire, while parallel transmission sends multiple bits simultaneously over multiple wires. Parallel is faster over short distances but more susceptible to interference.
Distinguish between half-duplex and full-duplex data transmission.
Half-duplex allows data transmission in both directions, but only one direction at a time (like a walkie-talkie). Full-duplex allows simultaneous two-way communication (like a telephone).
What is the key characteristic of synchronous data transmission?
Synchronous transmission involves sending data in a continuous stream with a clock signal to synchronize the sender and receiver. This ensures accurate timing and data interpretation.
How does asynchronous data transmission differ from synchronous transmission?
Asynchronous transmission uses start and stop bits to indicate the beginning and end of each data unit, removing the need for a constant clock signal. It's simpler but less efficient.
Define 'bit rate' in the context of data transmission.
Bit rate refers to the number of bits transmitted per second, usually measured in bits per second (bps) or kilobits per second (kbps). A higher bit rate indicates a faster data transfer speed.
More topics in Unit 2 — Data transmission
Types and methods of data transmission sits alongside these Computer Science decks in the same syllabus unit. Each uses the same spaced-repetition system, so progress in one informs the next.
Cambridge syllabus keywords to use in your answers
These are the official Cambridge 0478 terms tagged to this section. Mark schemes credit responses that use the exact term — weave them into your answers verbatim rather than paraphrasing.
Key terms covered in this Types and methods of data transmission deck
Every term below is defined in the flashcards above. Use the list as a quick recall test before your exam — if you can't define one of these in your own words, flip back to that card.
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