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Вопрос № 893215 - Английский язык

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Fiber-optic communication
1. In fiber-optic communications information is transmitted by sending light through optical fibers. The light forms an electromagnetic carrier wave that is modulated to carry information. First developed in the 1970s, fiber-optic communication systems have revolutionized the telecommunications industry and have played a major role in the advent of the Information Age.
2. Optical fiber is used by many telecommunications companies to transmit telephone signals, Internet communication, and cable television signals. Due to much lower attenuation and interference, optical fiber has large advantages over existing copper wire in long-distance and high-demand applications. However, infrastructure development within cities was relatively difficult and time-consuming, and fiber-optic systems were complex and expensive to install and operate.
3. Due to these difficulties, fiber-optic communication systems have primarily been installed in long-distance applications, where they can be used to their full transmission capacity, offsetting the increased cost. Since 2000, the prices for fiber-optic communications have dropped considerably.
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Fiber-optic communication systems are used mainly for long-distance communications as …
Варианты ответов
  • many telecommunications companies use them to transmit telephone signals, Internet communication, and cable television signals
  • information is transmitted by sending light through optical fibers
  • there they can be used to their full transmission capacity, offsetting the increased cost
  • optical fiber has much lower attenuation and interference
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Вопрос задал(а): Анонимный пользователь, 13 Ноябрь 2020 в 16:05
На вопрос ответил(а): Анастасия Степанова, 13 Ноябрь 2020 в 16:05

Похожие вопросы

Вопрос № 922948

Прочитайте текст и выполните задания.
Fiber-optic communication
1. In fiber-optic communications information is transmitted by sending light through optical fibers. The light forms an electromagnetic carrier wave that is modulated to carry information. First developed in the 1970s, fiber-optic communication systems have revolutionized the telecommunications industry and have played a major role in the advent of the Information Age.
2. Optical fiber is used by many telecommunications companies to transmit telephone signals, Internet communication, and cable television signals. Due to much lower attenuation and interference, optical fiber has large advantages over existing copper wire in long-distance and high-demand applications. However, infrastructure development within cities was relatively difficult and time-consuming, and fiber-optic systems were complex and expensive to install and operate.
3. Due to these difficulties, fiber-optic communication systems have primarily been installed in long-distance applications, where they can be used to their full transmission capacity, offsetting the increased cost. Since 2000, the prices for fiber-optic communications have dropped considerably.
Завершите утверждение согласно содержанию текста.
Fiber-optic communication systems are used mainly for long-distance communications as …
many telecommunications companies use them to transmit telephone signals, Internet communication, and cable television signals
information is transmitted by sending light through optical fibers
there they can be used to their full transmission capacity, offsetting the increased cost
optical fiber has much lower attenuation and interference

Вопрос № 922953

Прочитайте текст и выполните задания.
Fiber-optic communication
1. In fiber-optic communications information is transmitted by sending light through optical fibers. The light forms an electromagnetic carrier wave that is modulated to carry information. First developed in the 1970s, fiber-optic communication systems have revolutionized the telecommunications industry and have played a major role in the advent of the Information Age.
2. Optical fiber is used by many telecommunications companies to transmit telephone signals, Internet communication, and cable television signals. Due to much lower attenuation and interference, optical fiber has large advantages over existing copper wire in long-distance and high-demand applications. However, infrastructure development within cities was relatively difficult and time-consuming, and fiber-optic systems were complex and expensive to install and operate.
3. Due to these difficulties, fiber-optic communication systems have primarily been installed in long-distance applications, where they can be used to their full transmission capacity, offsetting the increased cost. Since 2000, the prices for fiber-optic communications have dropped considerably.
Ответьте на вопрос
What is the principle of information transmission with fiber-optic communications?
Internet communication is possible due to application of optical fiber in information transmission.
Information transmission through optical fiber is more advantageous in comparison with existing copper wire.  
In long-distance applications fiber-optic communication systems are used to their full transmission capacity.
The light sent through optical fibers forms an electromagnetic carrier wave that is modulated to carry information.

Другие вопросы по предмету Английский язык

Вопрос № 893216

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Human perception of motion
1. A television system involves equipment located at the source of production, equipment located in the home of the viewer, and equipment used to convey the television signal from the producer to the viewer. The purpose of all of this equipment is to extend the human senses of vision and hearing beyond their natural limits of physical distance.
2. A television system must be designed, therefore, to embrace the essential capabilities of these senses, particularly the sense of vision. The aspects of vision that must be considered include the ability of the human eye to distinguish the brightness, colours, details, sizes, shapes, and positions of objects. Aspects of hearing include the ability of the ear to distinguish the pitch, loudness, and distribution of sounds.
3. In working to satisfy these capabilities, television systems must strike appropriate compromises between the quality of the desired image and the costs of reproducing it. They must also be designed to override, within reasonable limits, the effects of interference and to minimize visual and audial distortions in the transmission and reproduction processes.
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Human perception of visual images while television transmission …
is the task of television systems equipment
can be improved while providing high quality images
is less affected by the effects of interference in comparison with audial perception
depends on the ability of human eye to distinguish the brightness, colours, details, sizes, shapes, and positions of objects

Вопрос № 893217

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How smartphones work
1. Thinking of a daily task it's likely there's a specialized, pocket-sized device designed to help you accomplish it. You can get a separate, tiny and powerful machine to make phone calls, keep your calendar and address book, entertain you, play your music, give directions, take pictures, check your e-mail, and do countless other things. But how many pockets do you have? Handheld devices become as clunky as a room-sized supercomputer when you have to carry four of them around with you every day.
2. A smartphone is one device that can take care of all of your handheld computing and communication needs in a single, small package. It's not so much a distinct class of products as it is a different set of standards for cell phones to live up to.
3. Unlike many traditional cell phones, smartphones allow individual users to install, configure and run applications of their choosing. A smartphone offers the ability to conform the device to your particular way of doing things. Most standard cell-phone software offers only limited choices for re-configuration, forcing you to adapt to the way it's set up.
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People use smartphones mostly because they …
take up less space
can be substituted by standard cell phones
let people be placed in the pocket
have considerably more advanced capabilities

Вопрос № 893218

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Cable television
1. Cable television is a system of providing television to consumers via radio frequency signals transmitted to televisions through optical fibers or coaxial cables as opposed to the over-the-air method used in traditional television broadcasting (via radio waves) in which a television antenna is required.
2. The abbreviation CATV is often used to mean «Cable TV». It originally stood for Community Antenna Television, from cable television's origins in 1948.  In areas where over-the-air reception was limited by distance from transmitters or mountainous terrain, large «community antennas» were constructed, and cable was run from them to individual homes.
3. It is most commonplace in North America, Europe, Australia and East Asia, though it is present in many other countries, mainly in South America and the Middle East. Cable TV has had little success in Africa, as it is not cost-effective to lay cables in sparsely populated areas. So-called «wireless cable» or microwave-based systems are used instead.
Определите основную идею текста.
Cable television system allows broadcasting in areas limited by distance from transmitters or mountainous terrain.
The application of cable television system in some countries is very expensive.
It is possible now to provide television via radio frequency signals transmitted to televisions through optical fibers.
Due to its means of application cable television is the way of broadcasting predominating mostly in densely populated areas.

Вопрос № 893219

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Satellite radio
1. A satellite radio or subscription radio (SR) is a digital radio signal that is broadcast by a communications satellite, which covers a much wider geographical range than terrestrial radio signals. Satellite radio offers a meaningful alternative to ground-based radio services in some countries, notably the United States. Mobile services, such as Sirius, XM, and Worldspace allow listeners to roam across an entire continent, listening to the same audio programming anywhere they go.
2. Radio services are usually provided by commercial ventures and are subscription-based. The various services are proprietary signals, requiring specialized hardware for decoding and playback. Providers usually carry a variety of news, weather, sports, and music channels, with the music channels generally being commercial-free.
3. In areas with a relatively high population density, it is easier and less expensive to reach the bulk of the population with terrestrial broadcasts. Thus in the UK and some other countries, the contemporary evolution of radio services is focused on Digital Audio Broadcasting (DAB) services or HD Radio, rather than satellite radio.
Определите основную идею текста.
Satellite radio is used alongside terrestrial broadcasts in areas with a relatively high population density.
Satellite radio is not so popular as Digital Audio Broadcasting (DAB) services or HD Radio in the UK.
People avoid employing satellite radio as it is costly and needs specialized hardware for decoding and playback.
Satellite radio is a high quality chargeable radio service available for people on a vast area and requiring specialized mechanical facilities.
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