Serial and Parallel Transmission
- Serial transmission: data sent one bit at a time, e.g. telephone lines, serial cables.
- Parallel transmission: data sent as multiple bits at once, e.g. parallel cables, printer connections.
Simplex, Half-Duplex and Duplex Communication Systems
- Simplex: one-way communication only, e.g. radio broadcast.
- Half-duplex: two-way communication, but only one direction at a time, e.g. walkie-talkie.
- Duplex: two-way communication, simultaneously in both directions, e.g. telephone call.
