Data communication
Speedrun
Data Communication in 30 Seconds
Data communication in 30 seconds. Go.
Quick check · tap an answer to continue
Lesson notes
Key points
- Five components: Every link needs sender, receiver, medium, message and protocol.
- Simplex to full duplex: Simplex is one way; full duplex sends both ways at once.
- Analog vs digital: Analog signals vary smoothly; digital signals jump between levels.
- Modulation: Modulation puts data onto a carrier by changing amplitude, frequency, phase.
- Impairments: Attenuation, distortion and noise all corrupt signals on the way.
- Protocols and layers: Layered protocols like OSI split communication into manageable jobs.
Takeaway: Components, modes, signals, modulation, impairments, protocols.
Quick check: What mode lets both ends transmit at the same time?
- Simplex
- Half duplex
- Full duplex
Full duplex carries traffic in both directions simultaneously.
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