O-LevelComputer ScienceData Transmission2210/12 · May/June 2017 · Q712 Marks
Computer A is communicating with computer B.
- (a)Draw an arrow or arrows to show simplex, duplex and half-duplex data transmission. The direction of the data transmission must be fully labelled. Simplex data transmission [Diagram: Computer A, Computer B] Duplex data transmission [Diagram: Computer A, Computer B] Half-duplex data transmission [Diagram: Computer A, Computer B][6]
- (b)State a use for the following data transmission methods. The use must be different for each data transmission method. Simplex Duplex[2]
- (c)A computer includes an Integrated Circuit (IC) and a Universal Serial Bus (USB) for data transmission. Describe how the computer uses these for data transmission, including the type of data transmission used. IC USB[4]
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Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- 7(a) 1 mark for correct arrow(s), one mark for correct description Simplex data transmission: Computer A -> Computer B OR Computer B -> Computer A (Direction of data is) one way only // unidirectional
- Duplex data transmission: Computer A <-> Computer B (Arrows in both directions) (Direction of data is both ways) at same time / simultaneously / concurrently
- Half-duplex data transmission: Computer A <-> Computer B (Arrows in both directions) but at different times / not at the same time / not simultaneously / not concurrently
- 7(b) 1 mark each use, must be different. Simplex e.g.: Microphone to computer Sensor to computer Computer to printer Computer to speaker Computer to monitor Webcam to computer Sending data to a device // sending data from a device Duplex e.g.: Telephone call Voice over IP Computer to printer (only award once) Instant messaging Broadband connections Video conferencing Sending data to and from devices e.g wireless technology Computer to modem
- 7(c) 2 marks for IC, 2 marks for USB IC ∞ parallel transmission // description of parallel ∞ for sending data internally USB ∞ serial transmission // description of serial ∞ for sending data externally (to and from peripherals / between devices)
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