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Prescription:NE200 Networks |
| Aim of Module | To enable students to describe and use the facilities and techniques available for the connection of local and remote computers and peripherals, concentrating mainly on asynchronous communications.
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| Credits | 7
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| Suggested Time | 70 student learning hours
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| Prescription Expiry Date | Nov 2002
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The Student Will
| | | | C | | Describe the Telecom network and the facilities and equipment offered for digital communications, with reference to: | | | 1.1 | Common carriers | | | - sub-lease | | | - VAN facilities - PACNET | | | - packet switch networks (PSN), (ISDN), etc. | | | 1.2 | Telephone network | | | - operation exchanges, trunks | | | - problems encountered for digital transmission | | | - options as distance increases, including speeds, error rate and costs | | | - direct dialled connection (dial-up) | | | - private permanent connection (leased line) | | | - direct connection between sites | | | - packet switched network (PSN)
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| | | | A | | Describe the facilities available to support local and remote terminal network; use and demonstrate these facilities: | | | 2.1 | Terminal types | | | | 2.2 | Terminal Connections | | | - local | | | - remote | | | - multiplexers | | | - frequency division multiplexers (FDM's) | | | - time division multiplexers (TDM's) | | | - statistical multiplexers (STATMUX's) | | | 2.3 | Data concentrators | | | 2.4 | Message switches | | | 2.5 | Front end Processors
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| | | | A | | Describe the concept of protocols and how these can be layered. Describe in detail and gain practical experience in the connection of RS232 devices. | | | 3.1 | Describe the main signals used in RS232 and V24, including (as a minimum) TXD, RXD, CTS, RTS, DTR, DSR, GND, CD. | | | 3.2 | Explain in detail the operation of these signals when communicating via a modem. | | | 3.3 | Explain the following transmission delays incurred: | | | - modem turnaround | | | - modem delay | | | - reaction time | | | - propagation delay | | | | 3.4 | Show the timings for a typical transmission sequence. | | | 3.5 | Explain and demonstrate the problems and solution of connecting RS232/V24 devices, including: | | | - connection and use of a null modem cable | | | - use of a break-out box (or similar) to connect devices including terminals and printer to computers
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| | | | C | 4.1 | Describe briefly the operation of these protocols and where they are used in an Asynchronous environment (eg: XMODEM). | | | 4.1.1 | Explain what quenching is and why it is necessary. | | | 4.1.2 | Explain the XON/XOFF protocol. | | | 4.1.3 | Describe the ASCII character-based protocols including the use of ACK, NAK, ENQ, ETB, ETX, EOT, SOH, STX, DLE, SYN) | | | 4.1.4 | Explain the concept of polling and why it is needed. Describe methods used including roll call and hub polling. | | | 4.2 | Simple line control protocols. | | | C | 4.2.1 | Describe in detail Binary Synchronous Communications (BSC), differentiating between synchronous/asynchronous transmission and synchronous/ asynchronous protocols. | | | C | 4.2.2 | Describe typical message formats. | | | A | 4.2.3 | Detail and apply the operation of the ten control characters mentioned in (4.1.3) | | | - establish connection | | | - transfer data | | | - terminate transfer | | | - indicate problems | | | (e.g. check-sum error, time out etc.)
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| | | | Note | | > | Access to modems and break out boxes (or similar) are essential for this subject. |
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