Match the beginnings and ends of the following sentences.
Date: 2015-10-07; view: 498.
| 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
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| Cellphones | | | Translate the following sentences, paying attention to the functions of participles. |