Технологии. Соотнесите отмеченные в тексте факты со следующими

Систем оптической связи, а также о практическом применении оптической

Прочитайте текст и найдите информацию о преимуществах применения

Exercise 6. Read and smile.

Much clearer a bit.

I have just a small point, but it may make things

To the discussion

Making contribution

Making remarks

Окончание

Statement.

Unfortunately, I cannot agree with your final

With Dr. B.

But I am not sure you are right.

Rd like to express agreement with the speaker

I am very sorry to have to say that I don't agree

I wish I could agree with you but...

We are not yet certain....

This is an interesting work but it has a lack...

It is surprising...

It is unbelievable...

I'm not surprised that it is possible...

I find it hard to believe...

Fd like to make a comment of general nature...

rd like to make two more remarks...

I have a few points to make...

Excuse me, but I'd just like to point out...

I'd like to add in connection with...

In addition, I'd like to mention...

Let me put some more questions...

A Story Too Terrible To Tell

Three men came to New York for the first time. They took a

room in a hotel. In the evening they went sight-seeing and did not

come back till nearly three in the morning. The room they had

taken was on the 43rd floor. «I am sorry, gentlemen», said the porter,

«but the elevator does not work, there is something wrong with

it. You will have to walk up to your room». This was too bad, but

the men agreed to tell stories on the way up in order to kill the time.

By the time the first one had told his story, they had climbed up

to the 11th floor. The next story kept them amused till they had

reached the 31st floor. At last it was time for the third man to tell

his story, but he refused. He said the story he had in mind was too

terrible, he simply couldn't tell it. They continued climbing and all

the time the two asked him to begin. At last they stopped and refused

to go on unless he told them his terrible story. «The story I

have to tell you is a short one», he said at last, «we have left the key

to our room downstairs with the porter».

Text lOB

оптических волокон в технике связи; о том, что послужило основой разработки

датами: 1960, 1970, 1982 гг. Изложите эту информацию по-английски.

Optical Technology

One of the most interesting developments in telecommunication

is the rapid progress of optical communication where optical

fibers are replacing conventional telephone wires and cables. Just

as digital technologies greatly improved the telephone system, optical

communication promises a considerable increase in capacity,

quality, performance and reliability of the global telecommunication

network. New technologies such as optical fibers will increase

the speed of telecommunication and provide new, specialized ininformation

service. Voice, computer data, even video images,

will be increasingly integrated into a single digital communication

network capable of processing and transmitting virtually any kind

of information.

It is a result of combining two technologies: the laser, first demonstrated

in 1960, and the fabrication 10 years later of ultra-thin

silicon fibres which can serve as lightwave conductors. With the

further development of very efficient lasers plus continually improved

techniques to produce thin silica fibres of incredible transparency,

optical systems can transmit pulses of light as far as 135

kilometers without the need for amplification or regeneration.

At present high-capacity optical transmission systems are being

installed between many major US cities at a rapid rate. The system

most widely used now operates at 147 megabits (thousand bits) per

second and accommodates 6,000 circuits over a single pair of glass

fibres (one for each direction of transmission). This system will

soon be improved to operate at 1.7 gigabits (thousand million bits)

per second and handle 24,000 telephone channels simultaneously.

A revolution in information storage is underway with optical

disk technology.

The first digital optical disks were produced in 1982 as compact

disks for music. They were further developed as a storage medium

for computers. The disks are made of plastics coated with aluminium.

The information is recorded by using a powerful laser to

imprint bubbles on the surface of the disk. A less powerful laser

reads back the pictures, sound or information. An optical disk is almost

indestructible and can store about 1000 times more information

than a plastic disk of the same size.

One CD-ROM disk (650 MB) can replace 300,000 pages of text

(about 500 floppies), which represents a lot of savings in databases.

The future of optical storage is called DVD (digital versatile

disk). A DVD-ROM can hold up to 17 GB, about 25 times an ordinary

CD-ROM. For this reason, it can store a large amount of multimedia

software and complete full-screen Hollywood movies in

different languages. However, DVD-ROMs are «read-only» devices.

To avoid this limitation, companies also produce DVD

rewritable drives.

Besides, it is reported that an optical equivalent of a transistor

has been produced and intensive research on optical electronic

computers is underway at a number of US companies as well as in

countries around the world.

It is found that optical technology is cost-effective and versatile.

It finds new applications every day — from connecting communication

equipment or computers within the same building or

room to long-distance transcontinental, transoceanic and space

communications.

Text IOC

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