Introduction of Telecommunication
Telecommunication is communication over a distance. The communication can be by cable, telegraph, telephone or broadcasting medium.
Here, tele means distance
In other words, telecommunication is exchange of information over distance by electronics mean. The medium can be voice, data or even video.
ITU defines telecommunications as ‘‘any transmission, emission, or reception of signs, signals, writings, images, and sounds; or intelligence of any nature by wire, radio, visual, or other electromagnetic systems.’’
The trunk of the tree represents the technological prerequisites for successive unfolding of the various telecommunication domains into the branches of the tree
The leaves of the branches represent evolution within the separate telecommunication domains
Evolution of Telecommunication
- 1876 – Alexendar Graham Bell invented telephone. At both ends, interpreter or telegrapher was required at initial. These telephones were intercom systems
- 1877 – Switchboard exchange telephone system was invented. It enabled combination of two phones to connect and talk.
- 1891 – Invention of dial telephone. Made calls via telephone quicker
- 1947 – Invention of transistors.
- 1948 – For transmission of phone signals, microwave was used where wire was not there.
- 1960 – Transition of phones from mechanical switching to electromic switching. This enabled voice messaging, caller ID etc.
- 1971 – First email was sent
- 1973 – First mobile (Cellular) phone was introduced
- 1984 –
- 1990 – Modern internet
- 200s – Mobile phone grow