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Name: Ngày sinh Class: Mã sinh viên Test: English For telecommunications Test 1 (Time: 90 minutes - Do not use dictionary) I. Answer the questions, basing on the passage. Telephones: Wires and Cables A modern telephone often includes a bell so it can ring and a keypad and frequency generator. There is an electronic microphone, amplifier and circuit. The mechanical bell is often replaced by a speaker and a circuit to generate a pleasant ringing tone. But a regular telephone remains one of the simplest devices ever. The telephone network starts in your house. A pair of copper wires runs from a box at the road to a box at your house. From there, the pair of wires is connected to each phone jack in your house (usually using red and green wires). If your house has two phone lines, then two separate pairs of copper wires run from the road to your house. The second pair is usually colored yellow and black inside your house. Along the road runs a thick cable packed with 100 or more copper pairs. Depending on where you are located, this thick cable will run directly to the phone company's switch in your area or it will run to a box about the size of a refrigerator that acts as a digital concentrator. Questions: 1. What does a modern telephone often contain? 2. Where does the telephone network start? 3. What happens if your house has two phone lines? 4. What is the usual colour of the pair of wires connected to the phone jack in your house? 5. How large is a digital concentrator? 1 II. Translate the passage into Vietnamese. (A modern telephone… red and green wires). III. Write complete sentences using the suggested words or phrases. 1. There / three major entities / provision / Internet service. 2. basic purpose / provide / means / synchronous data transmission. 3. Telecommunication / be / transmission / signals over / distance for / purpose/ communication. 4. Where line networks / set up / can be / classified / indoor and outdoor. 2 5. Bell / make / lot / inventions / but / telephone / most important. IV. Translate the following sentences into English. 1. Trong thông tin quang, các tín hiệu điện được biến đổi thành các xung ánh sáng. 2. Cáp kim loại có thể sử dụng cho cả hai loại kênh thoại - tương tự và số. 3. Các trạm lặp đầu cuối có thể được đặt trong trạm mặt đất hay các tổng đài chuyển tiếp. 4. Trước đây lưu lượng truyền trên mạng Internet chủ yếu là thông tin trên cơ sở văn bản. 5. Mạng LAN đặc biệt hữu dụng trong các công ty, trường đại học… V. Write about the importance and usefulness of Internet services. (about 100 words). 3 Name: Ngày sinh Class: Mã sinh viên Test: English For telecommunications Test 2 (Time: 90 minutes - Do not use dictionary) I. Answer the questions, basing on the passage. What is a Satellite? A satellite is basically any object that revolves around a planet. The moon is Earth's original, natural satellite, and there are many artificial satellites, usually closer to Earth. • The path a satellite follows is an orbit. In the orbit, the farthest point from Earth is the apogee, and the nearest point is the perigee. • Artificial satellites generally are not produced a lot. Most satellites are custom built. Yet, the GPS satellites (with over 20 copies in orbit) and the Iridium satellites (with over 60 copies in orbit). • Approximately 23,000 items of space junk which are floating above Earth. The actual number varies depending on which agency is counting. This online catalog of satellites has almost 26,000 entries! Although anything that is in orbit around Earth is technically a satellite, the term "satellite" is typically used to describe a useful object placed in orbit to perform some specific task. We often hear about weather satellites, communication satellites and scientific satellites. New words: - perigee: cận điểm, điểm gần trái đất nhất - artificial: nhân tạo - apogee: điểm xa trái đất nhất - custom built: sản xuất theo đơn đặt hàng - space junk: những vật thể bay trong vũ trụ Questions: 1. What is a satellite basically? - orbit: quỹ đạo A satellite is basically any abject that revlves around aplanet 2. What do apogee and perigee mean? The apogee is the farthest point from Earth The perigee is the nearest point. 3. How many copies of Iridium satellites are there in orbit? The are 60 copies in orbit. 4. What is the term "satellite" typically used to describe ? The term "satellite" is typically used to describe a useful … 4 5. Give one example of artificial satellites. Weather satellite, communication satellites… II. Translate the passage into Vietnamese. (A satellite is basically … 60 copies in orbit). III. Write complete sentences using the suggested words or phrases. 1. quality / speech transmitted /by satellite / good. Quality of speech transmitted by satellite is good 2. technique used / exchange / be / space division switching. The technique used in this exchange is known as space division switching. 3. data network / consist / number / components /which / interconnected. The data network consist of a number of components which are interconnected. 4. Today/ telecommunication devices / such as / television / radio / telephone / be / common / many parts / world. Today, telecommunication devices such as television radio and telephone are common in many parts of the world. 5 5. Voice communications / seldom / carried by / geosynchronous satellites. Voice communications is seldom carried by geosynchronous satellites IV. Translate the following sentences into English. 1. Các nhà cung cấp dịch vụ cung cấp truy cập Internet. The service provider provide to access Internet 2. Nhiệm vụ của hệ thống chuyển mạch là để thiết lập một kênh tạm thời giữa người gọi và thuê bao được gọi. the task of switching systems is to establish a temporary channel between the caller and called subscriber 3. Viễn thông đóng một vai trò quan trọng trong nền kinh tế thế giới. Telecom play an important role in the world economy. 4. Nguồn sáng có thể là đi ốt phát quang hay laser. Light sources can be rather light emitting diodes of laser 5. Một trong những cách phân lọai cáp thông tin là theo chất liệu. One of the classified information cables is on the material V. Write about the history of telephone exchanges. (about 100 words) 6 Name: Ngày sinh Class: Mã sinh viên Test: English For telecommunications Test 3 (Time: 90 minutes - Do not use dictionary) I. Answer the questions, basing on the passage. Perhaps the telephone you have in your house is one of the most amazing devices ever created. If you want to talk to someone, all you have to do is pick up the phone and dial a few digits. You are instantly connected to that person, and you can have a two-way conversation. The telephone network extends worldwide, so you can reach nearly anyone on the planet. When you compare that to the state of the world just 100 years ago, when it might take several weeks to get a one-way written message to someone, you realize just how amazing the telephone is! Surprisingly, a telephone is one of the simplest devices you have in your house. It is so simple because the telephone connection to your house has not changed in nearly a century. If you have an antique phone from the 1920s, you could connect it to the wall jack in your house and it would work fine! The very simplest working telephone could only contain three parts and they are all simple: • A switch to connect and disconnect the phone from the network - This switch is generally called the hook switch. It connects when you lift the handset. • A speaker - This is generally a little speaker. • A microphone - In the past, telephone microphones were so simple: carbon granules compressed between two thin metal plates. New words: - granules: những hạt nhỏ Questions: 1. What do you do with the telephone if you want to talk to someone? All you have to do is pick up the phone and dial a few digits 2. In what way can you realize how amazing the telephone is? When you compare that to the state of the world just 100 years ago. 3. How many parts could the very simplest working telephone contain? The are three parts. 4. What does a switch do? A switch to connect and disconnect the phone from the network. 5. Were telephone microphones in the past complicated: . II. Translate the passage into Vietnamese.( Perhaps the telephone … the telephone is!) 7 III. Write complete sentences using the suggested words or phrases. 1. Cellular communications service / systems / be design / serve mobile users. Cellular communications service is systems being designed by serve mobile users. 2. Stored Program Control / application / data processing and computer techniques / exchange. Stored Program Control is the application of data processing and computer techniques to an exchange. 3. concentrator / be / to collect traffic / a number / individual subscriber circuits. Concentrator is to collect traffic from a number of individual subscriber circuits. 4. Computer communication / across / Internet / be one / many examples / telecommunication. Computer communication across the Internet is one of many examples of telecommunication. 5. Electronic systems / installed / 1870s. Electronic systems were installed in 1870s IV. Translate the following sentences into English. 1. Nói chung các hệ thống viễn thông do các kỹ sư viễn thông thiết kế. Telecommunication systems generally designed by telecommunication engineers . 2. Trong thông tin quang, có hai loại bộ tách quang: đi ốt quang pin và đi ốt quang thác. In Fibre-optic communication, there are two types of photo detectors. The silicon pin photodiode and the silicon avalan the photodiode 3. Các linh kiện được gắn trên bản mạch in và nếu có lỗi, bản mạch in có thể được tháo ra và thay bằng một bản khác trong vòng vài giây. The components are mounted in the circuit and, if error, the circuit can be removed and replaced with other one in a few second. 4. Cáp quang có nhiều ưu điểm so với cáp đồng thông thường. Optical fibres have several advantages over conventional copper cables. 5. Điều xung mã là quá trình trong đó tín hiệu điện thọai tương tự được biến đổi thành tín hiệu số. Pulse code modulation is the process in which analogue signal is converted digital signal. V. Write about some advantages of optical fibers. (about 100 words) 9 Name: Ngày sinh Class: Mã sinh viên Test: English For telecommunications Test 4 (Time: 90 minutes - Do not use dictionary) I. Answer the questions, basing on the passage. The basic elements of a telecommunication system are: • a transmitter that takes information and converts it to a signal for transmission • a transmission medium over which the signal is transmitted • a receiver that receives and converts the signal back into usable information For example, consider a radio broadcast. In this case the broadcast tower is the transmitter, the radio is the receiver and the transmission medium is free space. Often telecommunication systems are two-way and devices act as both a transmitter and receiver or transceiver. For example, a mobile phone is a transceiver. Telecommunication over a phone line is called point-to-point communication because it is between one transmitter and one receiver, telecommunication through radio broadcasts is called broadcast communication because it is between one powerful transmitter and numerous receivers. Signals can either be analogue or digital. In an analogue signal, the signal is varied continuously with respect to the information. In a digital signal, the information is encoded as a set of discrete values (e.g. 1's and 0's). Telecommunications devices convert different types of information, such as sound and video, into electrical or optical signals. Electrical signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen. Questions: 1. What are the basic elements of a telecommunication system A transmitter, a transmission, a receiver 2. Why is telecommunication over a phone line called point-to-point communication? Because it is between one transmitter and me receiver . 3. How is the information encoded in a digital signal? In digital signal, the information is encoded as a set of discrete values. 4. How do electrical signals typically travel? They typically travel a long… as tradio waver. 5. What does the device on the receiving end do to the signal? 10 [...]... internet in communication 3 Giá của vệ tinh bắt đầu giảm, và kết quả là vệ tinh bắt đầu cạnh tranh với cáp ngầm dưới biển The cost of satellite began to fall steadily and, consequently, satellites have to compete with undersea cables 4 Thi t bị thu tín hiệu, khuyếch đại, đổi tần số và sau đó phát lại được gọi là thi t bị phát đáp The equipment which receives a signal, amplifies it, changes it is frequency... Less expensive - Several miles of optical cable can be made cheaper than equivalent lengths of copper wire This saves your provider (cable TV, Internet) and you money • Thinner - Optical fibers can be drawn to smaller diameters than copper wire • Higher carrying capacity - Because optical fibers are thinner than copper wires, more fibers can be bundled into a given-diameter cable than copper wires • Less... concentrators / in / cabinets In this solution, analogue transmission is only used for the lines between concentrators an the cabinets IV Translate the following sentences into English 1 Ngày nay, các tổng đài SPC có các đặc điểm như dễ điều khiền thi t bị và cấu trúc linh hoạt Today, SPC exchanges exchange are characterized by simple handling of the equipment and flexible structure 2 Anh ta chịu trách nhiệm... characterized by simple handling of the equipment and flexible structure 2 Anh ta chịu trách nhiệm về dự án hiện đại hóa thi t bị của họ He is responsible for our modernize devices project 3 Thi t bị này có thể giúp khách hàng tiết kiệm chi phí nhiên liệu và đáp ứng nhu cầu của họ this device can help customers to save fuel costs and meet their needs 4 Một vệ tinh có thể xử lý một lượng thông tin lớn... What are Fiber Optics? Fiber optics (optical fibers) are long, thin strands of very pure glass about the diameter of a human hair They are arranged in bundles called optical cables and used to transmit light signals over long distances If you look closely at a single optical fiber, you will see that it has the following parts: • Core – Thin glass center of the fiber where the light travels • Cladding... it is being transmitted over long distances This is to combat attenuation that can render the signal indistinguishable from noise A channel is a division in a transmission medium so that it can be used to send multiple independent streams of data For example, a radio station may broadcast at 96 MHz while another radio station may broadcast at 94.5 MHz In this case the medium has been divided by frequency... lỗi hay từ mới được phát hiện, chúng sẽ được làm nổi bật trên màn hình In the spell check program if errors or new words are detected, they are highlighted on the screen 4 Vệ tinh nhận, khuyếch đại và tái định hướng thông tin ta gửi lên cho nó A satellite receiver, amplifiers and redirects the information we send up to it 5 Trong những năm gần đây, công nghệ viễn thông phát triển với tốc độ rất nhanh... Remote access The Internet allows computer users to connect to other computers and information stores easily, wherever they may be across the world They may do this with or without the use of security technologies, depending on the requirements This is encouraging new ways of working from home, collaboration and information sharing in many industries An accountant sitting at home can audit the books... across the world 2 What is being encouraged by using Internet? This is encouraging new ways……………… sharing in many industries 3 What was the disadvantage of private, leased lines? 4 Can an officer away from his desk “open” his normal office PC? Yes, he can 5 How can he do it? II Translate the passage into Vietnamese (This is encouraging while he is away.) ... long-distance call was 15 minutes In the ringdown method, the originating operator called another intermediate operator who would call the called subscriber, or passed it on to another intermediate operator This chain of intermediate operators could complete the call only if all of the intermediate trunk lines were available at the same time In 1943 when military calls had priority, a cross-country US call