Communication initially relied on transportation: roads between cities, between provinces / states and between countries / continents. Then communication can take place remotely via the telegraph (1844), telephone (1867), electromagnetic radio waves (1889), commercial radio (1906), television broadcast (1931), then through television, the world became smaller because people can learn and get information about that happening in other parts of the world.
In telecommunications, the information conveyed through the signal.
There are two kinds of signals:
1. Digital: specifically refers to information that is represented by two states 0 or 1. Digital data transmitted by the two conditions represented only the 0 and 1.
2. Analog: continuous signal with a variation of the strength and quality. For example, sound, light and temperature that can vary its strength and quality. Analog data is sent in the form of a sustainable, continuous electrical signals in the form of waves.
Tidak ada komentar:
Posting Komentar
silahkan beri kritik dan saran untuk bloger ini...thank..^_^