5.10. Read the text and say which paragraph deals with the following:

1. cellphone networks;

2. how signal levels are controlled;

3. how the MSC locates a cellphone;

4. limitations of mobile phone systems;

5. frequency distribution within cells and clusters;

6. the development of mobile phones;

7. how cellphones link with other cellphones and with the telephone system.

5.11. Match the beginnings and ends of the following sentences.

1. Mobile phones using the VHF band were developed for use by … 2. Mobile phone systems work through a … 3. The lack of VHF bands for large numbers of individual users is the main reason for … of mobile units. 4. The same frequencies can be used for a large number of calls at the same time in the … 5. The size of the cells varies depending on the output power of the cellphone … 6.MSC is connected to other MSCs and to the … giving opportunity to make and receive calls via cellphones and fixed phones. 7. MSC first checks the registrations to find the position of the … 8. When the user takes the call, the 8 kHz signal is discontinued and the … is enabled.

a) limitations b) emergency services. c) cellular network area. d) transmitters e) central control base station f) speech channel g) public telephone exchange h) cellphone

5 .12. Answer the questions to the text.

1. Who uses mobile phones?

2. What does the MSC register of cellphones contain?

3. What is the difference between a mobile phone and a cellphone?

4. What does the word “cellphone” imply?

5. How large is the cell?

6. How does the MSC prevent interference caused by a strong signal level?

7. What is the most suitable number of cells to form a cluster?

8. When were radiophones developed?

9. How does an MSC ensure that a cellphone is using the right frequency for a call?

10. What is permanently connected to MSC?

GRAMMAR

Participle

5.13. Translate the following sentences, paying attention to the functions of participles.

1. IC is a miniaturized electronic circuit consisting mainly of semiconductor devices that have been manufactured in the surface of a thin substrate of semiconductor material.

2. The integration was an enormous improvement over the manual assembly of circuits while using electronic components.

3. The next step taken in the late 1960s introduced MSI.

4. Further development driven by economic factors led to LSI.

5. All components needed for a computer are included on a single chip.

6. Computing, communication, manufacturing and transport systems including the Internet all depend on the existence of IC.

7. A neighbouring electron can move to fill the hole leaving a hole at the place it has just come from.

8. The photon emitted has a very specific wavelength.

9. A robot is a mechanical device controlled by a computer.

10. Network connections using radio signals without network cables are becoming more common.

11. Robots, controlled by computers with neural nets, would be able to learn for themselves rather than depend on fixed programs.

12. Barcode is the sequence of vertical parallel lines used to give items unique identification numbers.

13. A smart card is a plastic card containing a processor and memory chip.

14. Students studying at our university must know Mathematics well.

15. The device made in our laboratory will be used in industry.

16. Scientists working at new computers have a lot of different problems to solve.

17. Having designed the car radar the engineers started complex tests.

18. The engine tested showed that it needed no further improvements.