Прочитайте текст и определите какой из заголовков соответствует тексту. A collection of transmitters...: ответ на тест 933117 - Английский язык

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A collection of transmitters, receivers or transceivers that communicate with each other is known as a network. Digital networks may consist of one or more routers that route information to the correct user. An analogue network may consist of one or more switches that establish a connection between two or more users. For both types of network, repeaters may be necessary to amplify or recreate the signal when it is being transmitted over long distances. This is to combat attenuation that can render the signal indistinguishable from noise.

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Signals can be either analogue or digital. In an analogue signal, the signal is varied continuously with respect to the information. In a digital signal, the information is encoded as a set of discrete values (for example ones and zeros). During transmission the information contained in analogue signals will be degraded by noise. Conversely, unless the noise exceeds a certain threshold, the information contained in digital signals will remain intact. This noise resistance represents a key advantage of digital signals over analogue signals.

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A channel is a division in a transmission medium so that it can be used to send multiple streams of information. For example, a radio station may broadcast at 96.1 MHz while another radio station may broadcast at 94.5 MHz. In this case, the medium has been divided by frequency and each channel has received a separate frequency to broadcast on. Alternatively, one could allocate each channel a recurring segment of time over which to broadcast – this is known as time-division multiplexing and is sometimes used in digital communication.

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Mobile phones have had a significant impact on 1_______ networks. Mobile phone subscriptions now outnumber fixed-line subscriptions in many markets. Sales of mobile 2_______ in 2005 totalled 816.6 million with that figure being almost equally shared amongst the markets of Asia/Pacific (204 m), Western Europe (164 m), CEMEA (Central Europe, the Middle East and Africa) (153.5 m), North America (148 m) and Latin America (102 m). Increasingly these phones 3_______ by systems where the voice content is transmitted digitally such as GSM or W-CDMA choosing to depreciate analogue 4_______ such as AMPS.

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This new super-cool 1_______ Brightman QT1 gives you the best in mobile 2_______:
– multimedia messaging to send snapshots to your friends
– 3_______ games, graphics and music
– infrared signal transmission to your computer (no cables!)
– voice-activated 4_______ – just speak to call
– programmable ring tones so you know who is calling before you answer
– detachable faceplate so you can change it to match your clothes
– antenna for clearer reception.

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The SP5 Deluxe is everything you need in 1_______ technology!
– multimedia messaging with pictures and 2_______
– make calls while browsing the Web
– digital and analog band modes for town and country
– voicemail 3_______ messages to your office
– large 4_______ with 6 text lines for text messages
– large key pad and scroll keys for easy navigation
– Personal Information Manager (PIM) for your appointment schedule
– wireless connection to your PC.