Data communication systems Key Terms

Signal‑to‑noise ratio

Ratio of signal power to background noise power, indicating clarity of the received signal.

Bandwidth

Frequency range occupied by the modulated signal, determining spectrum usage and data capacity.

Frequency stability

Ability of a transmitter to maintain a constant carrier frequency over time, affecting tuning precision.

communication system

communication system is a method cue for Principles of communication systems. Use it when working on "Identify the main parts of a communication system." and state the specific calculation, notation, or reasoning role it plays rather than treating it as a loose label.

Identify

Identify is used in Principles of communication systems to describe a specific electronics relationship between an input condition, a component response, and an output signal. In AQA A-Level Physics, define it in circuit context and explain how it changes the behaviour measured or observed.

analogue

analogue is a method cue for Principles of communication systems. Use it when working on "Compare analogue and digital communication qualitatively." and state the specific calculation, notation, or reasoning role it plays rather than treating it as a loose label.

digital

digital is used in Principles of communication systems to describe a specific electronics relationship between an input condition, a component response, and an output signal. In AQA A-Level Physics, define it in circuit context and explain how it changes the behaviour measured or observed.

attenuation

attenuation is a method cue for Transmission media. Use it when working on "Explain attenuation and signal loss." and state the specific calculation, notation, or reasoning role it plays rather than treating it as a loose label.

Explain

Explain is used in Transmission media to describe a specific electronics relationship between an input condition, a component response, and an output signal. In AQA A-Level Physics, define it in circuit context and explain how it changes the behaviour measured or observed.

time-division multiplexing

time-division multiplexing is a method cue for Time-division multiplexing. Use it when working on "Describe the principle of time-division multiplexing." and state the specific calculation, notation, or reasoning role it plays rather than treating it as a loose label.

Describe

Describe is used in Time-division multiplexing to describe a specific electronics relationship between an input condition, a component response, and an output signal. In AQA A-Level Physics, define it in circuit context and explain how it changes the behaviour measured or observed.

amplitude modulation

amplitude modulation is a method cue for Amplitude and frequency modulation. Use it when working on "Distinguish amplitude modulation from frequency modulation." and state the specific calculation, notation, or reasoning role it plays rather than treating it as a loose label.

frequency modulation

frequency modulation is used in Amplitude and frequency modulation to describe a specific electronics relationship between an input condition, a component response, and an output signal. In AQA A-Level Physics, define it in circuit context and explain how it changes the behaviour measured or observed.