Page 116 - Web Applications (803) Class 11
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Coaxial Cable
An electrical cable containing a copper conductor, an insulator covering it, and a braided metal mesh that reduces
crosstalk and signal interference is known as a coaxial cable. A braided metal conductor surrounds the insulator, which
helps to reduce cross talk and electrical signal interference. The core copper conductor is used to transmit signals, the
insulator to provide insulation to the copper conductor. To further safeguard the cable, the entire set-up is once more
wrapped with a layer of protective plastic. Coaxial cable installation is simple. These cables are more dependable and
long-lasting because of their improved cut-through resistance.
Protective
Plastic Layer
Braided
Metal Conductor
Insulator
Copper
Conductor
Fibre Optic Cable
A cable that communicates through electrical impulses is referred to as a fibre optic cable. These cables contain the
optical fibres that are plastic-coated and utilised to transmit data via light pulses. The plastic coating shields the optical
fibres from the effects of other types of wiring’s electromagnetic interference, heat, and cold. Compared to copper
wires, fibre optic cables offer faster data transmission. There is no electromagnetic interference that affects them.
However, fibre optic cable installation and upkeep are expensive and challenging.
2 cm
High density polyethylene
insulation (17 mm)
Copper tubing (8.3 mm)
Steel wires Water-resistant jelly
1 cm casing 2.3 mm)
Optical
fibers
Do You Know?
• Alexander Graham Bell is credited with creating Twisted Pair cables.
• Coax is another name for coaxial cable.
• In addition to being used for telecommunications, fibre optic wire is also employed by lasers, hydrophones
for seismic waves, SONAR, imaging devices, and sensors for measuring temperature and pressure.
Unguided Media
The electromagnetic waves are transmitted without the need of any physical medium in an unguided transmission. As
a result, it’s also called wireless transmission. Features of unguided media are as follows:
Ð ÐThe signal travels over empty space (air).
114 Touchpad Web Applications-XI

