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Information and Communications
Technology Qualifications
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| Prescription: DC700 (DC300)Data Communications |
| Aim of Module | Students will gain an understanding of techniques used to compress data and to ensure network data integrity and security, and will extend their knowledge of data network protocols.
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| Credits | 7
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| Knowledge Assumed From | DC600 (DC200) Data Communications
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| Student Learning hours | 70
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| Content Revised | 2000
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| Prescription Expiry Date | Nov 2005
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LEARNING OUTCOMES
The Student Will
| | | | | P | 1 | Explain how the integrity and security of data transmissions and the associated networks is ensured, how data is compressed and investigate the use of these techniques in a practical application. | | | | | A | 2 | Describe typical public data network protocols and use a protocol analyser to examine in detail the data link and network layers. | | | Access to synchronous data communications equipment and a protocol analyser is essential. |
CONTENT
| | | | > | An explanation of data integrity will include; | | | | a) | Causes of errors on transmission media: | | | | - | attenuation and distortion | | | | - | methods of improving line quality | | | | | | | b) | Error detection/correction: | | | | - | error detection methods including parity, block sum check (BCC) and cyclic redundancy check (CRC) | | | | - | error correction methods including Forward Error Control (FEC); | | | | (eg. Hamming, and backward error control, including echo and Automatic Repeat Request (ARQ)) | | | | | | > | An explanation of security will include: | | | | - data encryption methods; e.g. Data Encryption Standard (DES) | | | | - multi-user system dial-back | | | | - security e.g. 128 bit | | | | | | > | Data compression methods will include Huffman coding and current modem techniques; eg. V.42bis and MNP. | | | | | | > | Investigation of these techniques will require monitoring network activity, identification of potential problems, including complete loss of the network, and documenting procedures for recovering a networked system. | | |
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| | | | > | Typical public data network protocols will include the following higher level data link control (HDLC) methods; LAPB and LAPD associated with X.25 (PSN), Frame Relay systems and ISDN. | | | | | | > | Data link control protocol details will include; frame formats, transparency, error handling and retransmissions, implementation details and frame analysis. | | | | | | > | Network layer protocol details will include; packet formats, routing methods, implementation details and packet analysis. | | | | | > | Investigation of the layered architecture of ATM, will include the lower layers unique to this high-speed transport technology.
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