O-LevelComputer ScienceData Transmission2210/12 · Oct/Nov 2016 · Q37 Marks
3 (a) Explain what is meant by: (i) Serial data transmission (ii) Parallel data transmission (b) A computer in a factory is connected to a printer. The printer is located in an office 1 km away from the factory. Identify which data transmission method would be most suitable for this connection. Give two reasons for your choice. 1 2
- (a)(i)Serial data transmission[2]
- (a)(ii)Parallel data transmission[2]
- (b)A computer in a factory is connected to a printer. The printer is located in an office 1 km away from the factory. Identify which data transmission method would be most suitable for this connection. Give two reasons for your choice.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [2] (a)(i) Any two from:
- serial
- one bit sent at a time // bits sent sequentially
- over a single wire
- synchronous or asynchronous
- [2] (a)(ii) Any two from:
- parallel
- several bits / a byte sent at a time
- using many / multiple wires
- synchronous
- [3] (b) serial
- Any two from:
- serial data transmission more reliable over long distances
- less likely for the data to be skewed/out of synchronisation
- less interference as only a single wire
- it is a cheaper connection as only single wire needed // cheaper to set up
- a fast connection is not required as a printer is limited by its printing speed
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