O-LevelComputer ScienceData Transmission2210/12 · May/June 2023 · Q49 Marks

A student uses a mobile phone to take photographs for a school project. The student needs to transmit the photographs to their computer. They could use serial data transmission or parallel data transmission to transmit the photographs.

(a)(i)Describe how the photographs would be transmitted using serial data transmission.[2]
(a)(ii)Give two benefits of transmitting the photographs using serial data transmission.[2]
(a)(iii)State one benefit of the student using parallel data transmission instead of serial data transmission.[1]
(b)(i)State the name of this device.[1]
(b)(ii)Describe what is meant by cloud storage.[2]
(b)(iii)Give one disadvantage of storing the photographs in cloud storage instead of storing them locally.[1]

Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

[1] Data is sent one bit at a time
[1] A single wire is used
[1] Data won't be skewed
[1] Less chance of interference/crosstalk/corruption/error
[1] Transmission speed is adequate
[1] The data may be transmitted quicker
[1] Router
[1] A collection of servers
[1] ... that store data in a remote location // that allows data to be accessed remotely
[1] ... that are (normally) accessed using an internet connection
[1] May be less secure // by example
[1] May lose access to them if internet connection lost/not available
[1] Reliant on a third party maintaining the hardware // by example
[1] Could incur an extra/ongoing fee/cost

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