“far,” and phone, meaning "sound," and refers to a telecommunications device that allows the human voice to travel across great distances. There are different types of telephones and corresponding types of telephone systems. The three main types of telephone systems are Plain Old Telephone Service, cellular wireless phones, and Internet
Protocol phones.
Landline telephone systems are part of the Plain Old Telephone Service (POTS), the analog service with copper wiring that is the direct great-grand-baby of the original telephone system courtesy of Alexander Graham Bell. The advantages include standardized equipment, predictable sound quality, and — due to direct connections to the central office of the company — no need to share the system’s capacity with
others. Because switches are in place, creating a private circuit for each phone call, it is also called the Public Switched Telephone Network (PSTN). A new-fangled term, given the recent alternatives, is “landlines.”
Another of the types of telephone systems is for cellular wireless phones, with individual companies having their own networks with varying technology. Like POTS systems, cellular wireless telephone systems are full-duplex systems, meaning that both people on the call can talk at the same time, but cell phones use radio frequencies, rather than copper wire. Though cellular networks began as mobile voice networks only, they now carry both voice and data. Some networks are national,
while others are international, and new technologies are continually in development. The networks known as 3G support not only cell phones, but also netbook computers, smartphones, and wireless modem aircards.
Internet Protocol (IP) telephone systems, also called Voice over Internet Protocol (VoIP), are another group of the telephone systems that are in use in the 21st century. This type of telephone service piggy-backs on existing Internet service, either cable service or DSL broadband. A device called an Analog Telephone Adaptor is the go between that connects whatever phone you happen to have with either your broadband modem – or your router, if you have one.
IP systems can be set up with a single line for both Internet and telephone service, which can save money.
With an Integrated T1 line, instead of being set up for voice, on the one hand, or data, on the other, the T1 line is able to handle both. With Dynamic T1, the line is capable of assigning bandwidth as needed, given the current use.

10-11 класс английский язык ответов 1

GrekovOnline / 02 марта 2014 г., 18:07:07

Read the sentences. Then ask the questions.

1) We played badminton yesterday.
2) The children drew a nice a picture last night.
3) Jim read [red] an interesting fairy tale last Sunday.
4) Jill wrote a letter to Santa Claus last week.
5) They skied in the park yesterday.
6) Simon caught a big fish a month ago.

10-11 класс английский язык ответов 1

Islam25 / 03 авг. 2013 г., 2:00:40

Because accounting affects people in many different fields, public accounting and private accounting include specialized services.

Auditing is the accounting profession's most significant service to the public. An audit is the independent examination that assures the reliability of the accounting reports that management prepares and submits to investors, creditors, and others outside the business. In carrying out an audit, CPAs (Certified Public Accountants) from outside a business examine the businesses financial statements. If the CPAs believe that these documents are a fair presentation of me business's operations,, the CPAs give a professional opinion stating that the firm's financial statements are in accordance with generally accepted accounting principles, which is the standard. Why is the audit so important? Creditors considering loans want assurance that the facts and figures the business submits are reliable. Stockholders, who have invested in the business, need to know that the financial picture management shows them is complete. Government agencies need accurate information from business.

10-11 класс английский язык ответов 1

Yakorhina / 14 авг. 2013 г., 14:19:48

read the following "angry" letter to the editor. Write a letter in defense of technological progress. Use the arguments from the box and/ or

your own ones.

Dear Editor,
I really don't think that readers need your journal any more. In your articles you write about new achievements of scientists and about all those "man made wonders". I'm strongly against the propaganda of technological progress. It has done people more harm than good. It has created the nuclear bomb, it has made lots of animal species extinct, and now it's destroying the ozone layer and causing global warming. It will bring us to collapse very soon.
I demand that scientific research of any kind should be prohibited, and journals like yours should be closed. People need fresh air and clean water and don't need any technological progress.
Sincerely your,
John Lester

Useful language
Achievements in medicine make it possible for people to live longer.
Different devices are able to sustain people's life during operations.
Household appliances have altered our lifestyle considerably.
Efficient means of transport and communication can bring together people who are separated by the ocean.
Computers and robots accelerate research in the ocean and the cosmos.

Dear Mr Lester
I've read your letter on the technological progress but cannot agree with you. Though technology affects nature and the environment, it would be unfair to say that they don't do people anything good.

_______________________________________________________________________

However,you are right that we should do something to stop the negative effects of the technological progress. We all need to think about it and be reasonable and constructive.
Regards,
Railya.

10-11 класс английский язык ответов 1

021104 / 23 янв. 2014 г., 1:31:31

You have received a letter from your pen-friend in which he/she complains that his/ her parents want him/her to read classical authors, while he/she is

fond of fantasy. Write a letter to your pen-friend in which you tell him/her
• whether your parents influence your choice of books to read
• what is your favorite literary genre and why
• where you usually get books you'd like to read.

10-11 класс английский язык ответов 1

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