Practical work on telecommunications

Hi, people!!! I know you're learning about telecommunications at school. I've found this article very interesting and I'd like to share it with you.
If there are words you don't understand, use the dictionary or on-line ones.

Read it and then, answer the following questions:
1) How important is telecommunication?
2) Draw the telecommunication system.
3) In your own words, describe
networks
channels
modulation
4) How has communication developed through time?
5) Describe the modern operation in not more than 150 words.

This task must be done in pairs for June 12th.