45

power and _______________ proportional to channel

noise.

5.The aim of any communications system is to provide the

______________ possible transmission rate at the

______________ possible power and with the least possible noise.

6.The biggest problems ______________ when data is transferred to devices outside the computer's circuitry.

6.Составьте 10 вопросительных предложений к тексту.

22

Modems

1. Слова к тексту. acronym ['ækr ənɪm] n сокращение

analog (analogue) ['æn əlɒɡ] n аналоговый

bundle with ['bʌndl wɪð] v связывать с

cable ['keɪbl] n кабель

call in [kɔ:l ɪn] v вызывать, отзывать coaxial [kəυ'æks ɪəl] a коаксиальный

combine [kəm'baɪn] v соединяться, объединять(ся) convenience [kən'vi:nɪəns] n удобство

cost-effective ['kɒst ɪ'fektɪv] a рентабельный; выгодный dial-up connection ['daɪəl ʌp kə'nekʃn] n соединение по

телефонной линии

digital ['dɪdʒɪtl] a цифровой

digital subscriber line (DSL) ['dɪdʒɪtl səb'skraɪbə laɪn] n цифровая

абонентская линия

disconnect [dɪskə'nekt]v разъединять, размыкать; отключать

23

download ['daυnləud] v загружать, пересылать (по линии связи), скачивать

(проф.)

efficient [ɪ'fɪʃnt] a эффективный; рациональный, целесообразный either … or … ['aɪð ə ...ɔ:] cj или … или …

external [ɪk'stɜ:nl] a внешний

fax transmission [fæks trænz'm ɪʃn] n передача факса frequency ['fri:kwənsɪ] n частота

in order to [ɪn 'ɔ:də tu:] cj для того, чтобы

include [ɪn'klu:d]v включать, содержать, заключать в себе

Integrated Services Digital Network (ISDN) ['ɪntɪɡreɪtɪd 'sɜ:vɪsɪz' dɪdʒɪtl 'netwɜ:k] n цифровая сеть с комплексными услугами, технология ISDN,

сеть ISDN

internal [ɪn'tɜ:nl] a внутренний

Internet service provider ['ɪntənet' sɜ:vɪs prə'vaɪdə] n поставщик

(провайдер) услуг Internet modem ['məυdem] n модем once [wʌns] adv как только

purpose ['pɜ:pəs] n назначение, цель reasonable ['ri:znəbl] a разумный, обоснованный

thus [ð ʌs] adv таким образом

tie [taɪ] v связывать

connect [kə'nekt]v соединять(ся)

tool [tu:l] n инструмент

transfer [træns'f ɜ:] v передавать

voice transmission [vɔɪs trænz'm ɪʃn] n передача голоса

24

2. Соотнесите слова.

3. Соотнесите слова с их определением.

4.Прочитайте текст. Озаглавьте его.

1.Modem is an acronym for modulator/demodulator. Modems are used to connect with an Internet service provider, and can also be used to send fax transmissions. You can either install an internal modem inside your computer or get an external modem for greater convenience and ease of installation. Once connected, the modem will transfer data back and forth between your computer and your service provider.

2.The types of available modems include analog, digital subscriber line (DSL), cable and Integrated Services Digital Network (ISDN). Analog modems are used for dial-up connections. DSL and cable are high-speed broadband connections. ISDN modems transfer information in channels of 64 kilobits per second (Kpbs) which can be combined for higher speeds.

3.Most computers come with an analog modem. These dial-up modems can download at speeds up to 56 kilobits per second (Kbps.) Your computer must use the modem to make a telephone call to your service provider in order to connect. This ties up the phone line, so you must disconnect in order to use the telephone for other purposes. DSL modems transfer signals on frequencies that are not used in voice or fax transmissions. Thus you can use the telephone and surf the Internet at the same time. Cable modems are attached to a coaxial cable. For

26

Internet connections, cable uses bandwidth that is unused in

cable television transmissions.

4.Dial-up modems are only connected to the Internet when they've called in to your service provider. DSL and cable connections are typically always on. DSL is always digital, but there are both digital and analog cable Internet modems. ISDN is also a dial-up service. It needs a network terminator and a terminal adapter to function. An ISDN modem is an adapter with an analog modem built in.

5.DSL and cable modems are the most efficient and cost-effective tools for connecting to the Internet. DSL connections can range between 128 Kbps and 6 megabits per second (Mbps). Cable connections can be as fast as 30 Mbps. Furthermore, DSL Internet service prices have dropped to the point where they're the same as or lower than dial-up service. Cable service is also available at reasonable prices, and can often be bundled with cable TV service. If you've given up your dial-up service in favor of broadband, you can still use your analog modem to send faxes.

6.DSL and cable Internet service providers sometimes place bandwidth caps on their users. These can lower your Internet speeds considerably. With cable service, the reduction in speed can be dramatic. With DSL, however, the difference will probably be much smaller. Also, DSL and cable companies may

27

cut off service or charge additional fees once users reach their

service limit. (Adopted from eHow.com)

5.Заполните пропуски в предложениях.

1.Modem is short for _______________/demodulator.

2.The modem _______________ data back and forth between your computer and your service provider.

3.Analog modems are used for ______________

connections.

4.You can use the telephone and ______________ the Internet at the same time.

5.DSL and cable modems are the most efficient and

_____________ tools for connecting to the Internet.

6.DSL and cable Internet service providers sometimes place ______________ caps on their users.

7.An ______________ modem is an adapter with an analog modem built in.

8.DSL connections can range between 128 Kbps and 6

____________ per second (Mbps).

6.Продолжите предложения.

1.Modems are used to connect …

2.You can either install an internal …

3.The types of available modems include analog, …

28

4.For Internet connections, cable uses …

5.DSL connections can range between …

6.Cable service is also available at …

7.If you've given up your dial-up service in favor of …

7.Письменно переведите абзацы 1, 2, 5.

8.Ответьте письменно на вопросы к тексту.

1.What types of modems are described in the text?

2.What are differences between DSL and IDSN modems?

3.What are advantages and disadvantages of each type of modems?

4.What types of modem are not mentioned in the text? Find information about them on the Internet.

Вразделе «Тексты для чтения» прочитайте «Wireless modems» и другие тексты о модемах.

29

Communications Channels

1. Слова к тексту.

allow [ə'laυ] v позволять, разрешать

connect [kə'nekt]v соединять(ся); связывать(ся)

convey [kən'veɪ] v перевозить, переправлять, транспортировать define [dɪ'faɪn] v определять, давать (точное) определение deliver [dɪ'lɪvə] v доставлять, разносить (письма, товары) depend [dɪ'pend]v зависеть (on, upon - от)

destination [destɪ'neɪʃn] n место назначения direction [daɪ'rekʃn] n направление

encapsulate [ɪn'kæpsj υleɪt] v заключать в капсулу, инкапсулировать facilitate [fə'sɪləteɪt] v облегчать; содействовать; способствовать flow [fləυ] n течение, поток

frame [freɪm] n рамка, рама

full-duplex [fυl'dju:pleks]a полнодуплексный garble ['ɡɑ:bl] v искажать

half-duplex [hɑ:f 'dju:pleks]a полудуплексный

handling ['hændl ɪŋ] n обращение (с кем-л., с чем-л.) уход; обработка link [lɪŋk] v соединять, связывать

obvious ['ɒbvɪəs] a очевидный, явный

originate [ə'rɪdʒəneɪt] v брать начало, происходить, возникать party ['pɑ:tɪ] n сторона

pathway ['pɑ:θweɪ] n дорога, путь

physical presence ['fɪzɪkl 'prezns]физическое присутствие

30

possess [pə'zes]v обладать, владеть

refer [rɪ'fɜ:] v ссылаться (to — на кого-л., на что-л.) represent [reprɪ'zent]v представлять

reverse [rɪ'vɜ:s] a обратный; перевёрнутый; противоположный simplex ['sɪmpleks] a симплексный

simultaneous [sɪml'teɪnɪəs] a одновременный

wire [waɪə] n проволока; провод

2. Соотнесите слова.

3. Соотнесите термины с их определением.