Unit 9 (text A) Q

Question 1

What are the qualities of light-wave communication system?

Answer 1

Efficiency
Versatility
Cheapness to install and support

Question 2

What is the efficiency of light-wave communication system?

Answer 2

Enormous amount of information can be transmitted into the long distances
(more than 2700 pages over thousands of miles in only 6 seconds)

Question 3

What is the versatility of light-wave communication system?

Answer 3

Speed
Capacity
Transmitting any types of information

Question 4

Is it cheaper to install and operate light-wave system or wire-and-cable system?

Answer 4

Light-wave system
The system allows considerable savings

Question 5

Is there any difference between conventional and light-wave systems?
What are they based on?

Answer 5

Yes, there is
Conventional system is based on the electron conduction through metal
Light-wave system is based on photons passing throughout the glass fibre

Question 6

Are light-wave systems immune to electromagnetic interference?

Answer 6

Yes, they are
They don’t require additional protection

Question 7

Why does light travels farther through light-wave cables without regeneration than electrons through copper wires?

Answer 7

It happens because the light encounters little resistance from the very pure glass fibre

Question 8

How many signal regenerators every mile do light-wave systems require?

Answer 8

One regenerator per ten miles
1 / 10 miles