Twisted 1. cables are commonly used for small areas. They are available in two distinct types: •2. twisted pair (STP), which consist of a copper telephone and a local area network wiring enclosed in a 3. ; • unshielded twisted pair (UTP), which features no 4. shielding. 5. cables, carry signals at higher frequency than twisted pair cables. Their structure is composed of a PVC jacket, an internal metallic shield, a dielectric 6. , and a copper centre 7. . Because of this design, they are widely used in cable television signal transmission, Internet networking, and to connect radio to 8. . Finally, 9. cables transmit data signals in the form of 10. . They are built with layers of 11. materials, making them especially suitable for areas with electrical 12. .
5.1 Answer the question: what do transmission lines consist of?aperta
Soluzione suggerita:They consist of cables that connect different units of transmission.
5.2 Answer the question: why do twisted pair cables offer good protection from electromagnetic interference?aperta
Soluzione suggerita:Because their wires are enclosed in a shield.
5.3 Answer the question: why are unshielded twisted pairs different from shielded twisted pairs?aperta
Soluzione suggerita:They do not have any metallic shielding around the wires and do not require any grounding cable.
5.4 Answer the question: what are the advantages of unshielded twisted pairs over twisted pair cables?aperta
Soluzione suggerita:They are easier to install, require less maintenance, and are cheaper.
5.5 Answer the question: what do coaxial cables consist of?aperta
Soluzione suggerita:They are made of an external PVC jacket, an internal metallic shield that contains a dielectric insulator, and a copper conductor.
5.6 Answer the question: what are coaxial cables used for?aperta
Soluzione suggerita:For broadband Internet networking cables, cable television signals, and to connect radio transmitters and receivers to their antennas.
5.7 Answer the question: what are fibre optic cables?aperta
Soluzione suggerita:They are cables made of glass used to transfer data signals in the form of light.
5.8 Answer the question: what are fibre optic cables suitable for?aperta
Soluzione suggerita:They are suitable for areas with electrical interference.
6. Watch the video, then match the beginnings and endings.
with a compound of chemicals.in straight lines.capacity than copper cables.you can see a dot appear on the wall.signals can easily pass through glass fibres.transparent liquid is like a glass fibre going around a corner.
If we shine the laser through the hole in the bucket, … →
Light travels… →
Total internal reflection happens if you coat the internal surface of the glass fibres… →
In the experiment, the flow of… →
Thanks to total internal reflection, … →
Fibre optics technology has 1,000 times greater… →