- •U n I t 1 telecommunications
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Telecommunication
- •1 Find in the text English equivalents to the following Russian words and word combinations:
- •6 Fill the blanks using the words below:
- •Telephone
- •1 Using the text give derivatives from the following words and translate them into Russian:
- •2 Fill the blanks using the words below:
- •3 Answer the following questions:
- •4 Translate the following sentences from English into Russian:
- •5 Read the text, describe the principal of telephone communication
- •Radio communications
- •1 Answer the following questions:
- •3 Choose from part II the appropriate continuation of the sentences.
- •4 Translate without using a dictionary.
- •5 Look at the following short descriptions of processes:
- •1 Using the information from the first three texts translate the following one from Russian into English.
- •U n I t 2 modulation
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Modulation
- •1 Answer the following questions:
- •2 Reply to the following sentences with a suitable question:
- •3 Translate the following fragment into English using the information from the text.
- •4 Make up a summary of the text using the cliché:
- •Digital and analog modulation methods
- •1 What do the following abbreviations stand for?
- •2 Translate the following sentences into English:
- •3 Choose from part II the appropriate continuation of the sentences.
- •4 Read the following paragraph. Fill in each blank with a suitable word given below.
- •5 Translate without using a dictionary
- •6 Make a brief summary of the text.
- •Modulator and demodulator
- •1 Translate the following word-combinations into Russian:
- •2 Answer the following questions:
- •3 Read the following paragraph. Fill in each blank with a suitable word given below.
- •4 Translate without using a dictionary.
- •1 Using the information from the first three texts translate the following one from Russian into English.
- •Модуляция и помехоустойчивое кодирование
- •U n I t 3
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Transmission systems
- •1 Answer the following questions:
- •2 Complete the following simple process description of the function of a terminal repeater station:
- •3 Complete the following tree diagram:
- •4 Read the following paragraph. Fill in each blank with a suitable word given below.
- •Why optical fibers are useful and how they work
- •1 Below are the advantages of optical fibers. Match them with an appropriate explanation:
- •2 Discuss the importance of the above advantages in using optical fiber in public telephone networks. Try to rank the above advantages in order of importance.
- •3 Complete the following tables:
- •4 Read the following paragraph. Fill in each blank with a suitable word given below.
- •5 Reply to the following sentences with a suitable question:
- •6 Make a brief summary of the text.
- •1 Answer the following questions:
- •2 Read the following paragraph. Fill in each blank with a suitable word given below.
- •3 Translate the following sentences into English:
- •1 Using the information from the first three texts translate the following one from Russian into English.
- •Оптоволокно
- •U n I t 4
- •1 Read and memorize the following words and word-combinations:
- •2 Translate the following word-combinations into English:
- •Telephone exchanges
- •1 Answer the following questions:
- •2 Complete the following table: Main characteristics of the systems
- •3 Choose from part II the appropriate continuation of the sentences.
- •4 Put the verb in brackets into the correct tense.
- •5 Read the following paragraph. Fill in each blank with a suitable word given below.
- •6 Make up a summary of the text using the cliché:
- •Switching technologies
- •1 Integrated Digital Transmission and Switching
- •1 Complete the following table:
- •3 What are the advantages of using (large-scale) integrated circuits in an exchange?
- •4 Match the following terms with a suitable explanation:
- •5 Translate the following sentences into Russian:
- •Public Data Networks
- •1 Answer the following questions:
- •2 Match the facilities with the appropriate description:
- •3 Discuss in what situations and for which user groups the above facilities would be useful.
- •1 Using the information from the first three texts translate the following one from English into Russian.
- •Digital switches
- •Оглавление
- •Английский язык
- •246653, Г. Гомель, ул. Кирова, 34.
- •Английский язык
- •246653, Г. Гомель, ул. Кирова, 34.
1 Translate the following word-combinations into Russian:
Data transmission, error-correcting codes, bit stream, IF signal, RF signal, periodic spectrum, harmonic distortion, high-frequency carrier waveform, band pass filtering, equalization filtering, quantization of the amplitudes, digital communication system, digital-to-analog conversion, to limit the bandwidth, frequency or phase value, low pass signal.
2 Answer the following questions:
1 What is the aim of adaption of pulse shaping?
2 What is the result of the high-frequency carrier waveform modulation?
3 What is the aim of amplification and analog band pass filtering?
4 How does the modulator transmit data?
5 What is automatic gain control used for?
6 What does the demodulator perform?
7 What device performs analog-to-digital conversion? and inverse operation?
3 Read the following paragraph. Fill in each blank with a suitable word given below.
Misleading, transmitting, than, the, modem, baud rate, for, to, both, digital, analog, telephone, modulator-demodulator, measure, most, the most, at, per, carried, transmit, take, speed.
The word modem is short for _________. Modulation is the name of the process of converting from ______ to _______. Demodulation is the process of converting from_______to_______. The ______ enables digital microcomputers to communicate across analog ______ lines. _____voice communications and data communications can be ______ over the same telephone line.
The speed with which modems ______data varies. Communications speed is often measured in ______. _______ represents the number of changes in the electrical state in the line____ second. Unfortunately, this measure can be ______. At the low speeds, baud rate is equivalent to bits per second (bps). However, ___ higher speeds, baud rate is not equal ___ bits per second. ___ this reason, _____ communications professionals prefer to ____ modem ____ in bits per second.
_____ popular microcomputer speeds are 1200, 2400, 9600, 14400, 33600, 56600 bps. ____higher the speed, ___ faster your can transmit a document – and therefore ___cheaper your line costs. For example, _____ a 10-page single-spaced report could ____ 5 minutes at 1200 bps. It would ____ 2,5 minutes at 2400 bps and less ____ 40 seconds at 9600 bps.
4 Translate without using a dictionary.
The three types of modems are external, internal and wireless.
The external modem stands apart from the computer and is connected by a cable to the computer’s serial port. Another cable connects the modem to the telephone wall jack. Some modems weigh as little as 3 ounces, making them practical for use with portable computers.
The internal modem consists of a plug-in circuit board inside the system unit. A cable directly connects the computer’s serial port to the telephone wall jack.
The wireless modem is very similar to the external modem. It connects to the computer’s serial port. Unlike external modems, it doesn’t connect to telephone lines. Rather, wireless modems receive through the air. This is a new type of modem using new technology. Although not as fast as the other modems, wireless modems are becoming popular with users of portable computers.
Not all computer communications require a modem to convert from digital to analog and back. Computer systems connected by coaxial or fiber optic cables can transmit digital data directly through these channels.