Radio systems. Give their Russian equivalents
Date: 2015-10-07; view: 385.
Conclusion
Cellular radio is a comparatively young technology. Networks employing analogue systems have developed rapidly and now provide high quality service and excellent coverage in many of the developed countries. Technology developments are now increasing the potential network capacity, reducing the size of mobiles, and bringing advanced features and services to the mobile user. The decade ahead with the opportunity to introduce new digital systems and create a world-wide land mobile standard looks particularly exciting.
Exercise 1 Write out of the text (47.6 – 47.8) all terms referring to cellular
Exercise 2 Words to remember:
| HDLC protocol- (High Level-Data-Link Control) | высокоуровневое управление каналом (передачей) данных |
| forward error correction | прямое исправление ошибок |
| contiguous coverage | соприкасающиеся зоны обслуживания |
| CDMQ –(code division multiple access) | коллективный (многостанционный) доступ с кодовым разделением каналов |
| ultimate capacity | придельная способность |
| noise performance | шумовая характеристика |
| relevance | соответствие, отношение |
| to divert | отклонять, отводить, изменять маршрут |
| infomation service = enquery office | телефонная справочная служба |
Exercise 3 Read the text and translate it without a dictionary
Exercise 4 Speak on the problems (work in pairs):
| supplementary services (the most typical ones) | |
| value added services | |
| data services |
Exercise 5 Answer the following questions:
| What is the primary purpose of all cellular radio networks? | |
| Do they offer a range of supplementary and value added services? | |
| What are the typical supplementary cervices? | |
| Which of value added services are considered to be the most important? | |
| Can you ask your groupmates 4-6 questions about data services? (47.6.3 Data Services)? | |
| How can you prove that the technology of cellular radio systems continues to develop very rapidly? | |
| What do microcellular techniques allow to achieve? | |
| What are these developments aimed at? | |
| One way of easing handover problems is to employ an “umbrella cell”, isn't it? | |
| What advanced services do intelligent networks provide? | |
| Is there any difference between the term PCN and the term PCS? | |
| What are the main advantages of CDMA? |
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| Personal communications | | | Find these 15 words in the word search, and draw lines through them. The words go from left to right, and from top to bottom. |