Information Processes and Technology
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Error detection and checking in communication systems
Outcomes assessed by this unit
The Student:
H1.1 applies and explains an understanding of the nature and function of information technologies to a specific practical situation
H1.2 explains and justifies the way in which information systems relate to information processes in a specific context
H2.1 analyses and describes a system in terms of the information processes involved
H2.2 develops and explains solutions for an identified need which address all of the information processes
H3.2 demonstrates and explains ethical practice in the use of information systems, technologies and processes
H4.1 proposes and justifies ways in which information systems will meet emerging needs
H5.2 assesses the ethical implications of selecting and using specific resources and tools, recommends and justifies the choices
Source: Board of studies NSW, Stage 6 Information Processes and Technology, Preliminary and HSC Courses (1999)
Activity 1
- Define the following terms:
Term Definition Parity check Odd parity Even parity Parity bit checksum Packet Cyclic redundancy check Binary number
- Under what conditions would a parity bit check fail to show errors?
- How are the problems with a checksum error check similar to the problems faced by a parity bit check.
- Draw a diagram which explains the problems with a checksum error check. Use the drawing under the heading of checksum to help guide you. However you must be entirely original.
- Why is CRC more successful in picking up errors than a parity check or a checksum?
- Discuss the following statement, “Networks would be entirely unworkable without a method to check for errors.”
- Discuss the following “Every form of information system is dependant on
some reliable form or error checking, without them they would collapse in a
bundle.”
- Look at the following image. The image describes a problem with the checksum error checking method. Explain the problem with checksum.
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