DataTransmissionQ - What is meant by the terms serial and...

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Answer the following question on Data Transmission a) Describe how radio and microwave communications systems can be extended through the use of satellites. Explain the difference between geosynchronous and LEO (Low Earth Orbit) satellites. (6) b) You are setting up a network for a small company, which has seven computers, two printers, and one scanner that need to be connected. All equipment is located on one floor in a relatively small area. Costs must be kept at a minimum, and the network doesn’t need to be especially fast. Which transmission medium would you recommend a n d w h y ? ( 5 ) c) RS-232 standard defines a mechanism for transmitting characters across short distances. More formally, RS-232 defines a standard for serial, asynchronous communication.
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Unformatted text preview: What is meant by the terms serial and asynchronous ? (2) d) Draw a diagram, with explanation, to show the change of voltage over time when RS-232 transmits the following sequence of seven bits: 1011010. (4) e) With the aid of diagrams compare and contrast amplitude modulation , frequency modulation and phase-shift modulation . (6) f) What is a modem? Briefly describe the operation of a dial-up modem. (6) g) Explain how ADSL (Asymmetrical Digital Subscriber Line), which uses the two-wire local loop from telephone companies, achieves much higher data rates (e.g. 1.5 Mbps) than dial-up modems. (4)...
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This note was uploaded on 08/14/2011 for the course ELECTRONIC G52CCN taught by Professor Professorgail during the Spring '09 term at Uni. Nottingham.

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