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Unit 3.3 Telecommunications
Page 149


13. Match each term with the correct definition.
The height of a wave, from its highest to its lowest point.A device that produces radio waves from an antenna.A device that receives radio waves.Cables made of two twisted copper wires covered with insulating material.Cable with an internal metallic shield.A type of electromagnetic wave used in remote controls.The distance from any point on one wave to the same point on the next wave.The range of waves.A type of electromagnetic wave normally used in telephone and satellite communication.Cable that transfers data signals in the form of light.
Electromagnetic spectrum →
Receiver →
Amplitude →
Infrared →
Coaxial →
Wavelength →
Twisted pairs →
Microwave →
Optic fibre →
Transmitter →
14.1 Translate the following sentence into English: I cavi a fibra ottica possono essere utilizzati sia per lunghe che per brevi distanze. aperta
14.2 Translate the following sentence into English: Le onde elettromagnetiche sono campi elettrici e magnetici che viaggiano attraverso lo spazio vuoto. aperta
14.3 Translate the following sentence into English: Lo scopo di un radiotrasmettitore è la comunicazione di informazioni a distanza. aperta
14.4 Translate the following sentence into English: I cavi coassiali sono molto adatti per installazioni domestiche. aperta
14.5 Translate the following sentence into English: Le microonde hanno una lunghezza d’onda minore di altre onde radio. aperta
14.6 Translate the following sentence into English: Lo spettro elettromagnetico descrive tutti i tipi di luce, anche quelli che l’occhio umano non può vedere. aperta
15. Read the text and fill in the gaps with the missing words.

spectrum • unshielded • insulating • pair • cables • conductor • fibre • STPs • transmission • coaxial

Differences between Cables
Twisted 1. cables are most effectively used in a system that uses a balanced line method of 2. . Cables with shields are called twisted pair cables and commonly abbreviated as 3. . 4. without shields are called 5. twisted pair cables or UTPs. A UTP cable is generally used on Ethernet.
6. cables consist of two conductors. The inner 7. is contained inside the insulator, with the other conductor weaving around it providing a shield. An 8. protective coating called a jacket covers the outer conductor.
9. optical cable consists of thin glass fibre that can carry information at frequencies in the visible light 10. . The typical core diameter is 62.5 microns.

Adapted from: https://www.geeksforgeeks.org/difference-between-twisted-pair-cable-co-axial-cable-and-optical-fiber-cable/