a. Definition

Telecommunication is the transmission or delivery technique infomasi, from one place to another. In relation to the 'telecommunications' form of long distance communication can be divided into three kinds:

• Communication One Direction (Simplex). In one-way communication (Simplex) sender and recipient information can not establish a continuous communication through the same medium. Example: Paging, television, and radio.
• Two-Way Communication (Duplex). In a two-way (duplex) sender and recipient information can establish a continuous communication through the same medium. Example: Phone and VOIP.
• Two-Way Communication Semi (Half Duplex). In the spring two-way communication (Half Duplex) transmitter and receiver alternately informsi communicate while remaining sustainable. Example: Handy Talkie, FAX, and Chat Room

b. The basic components

To be able to telecommunications, there are several components to support are:

1. Information: data that is sent / received as sound, image, file, paper
2. Sender: turning information into electrical signals that are ready to be sent
3. Media transmission: a tool that serves to send from the sender to the recipient. Because of the distance, then changed again sending signals (modulated) radio waves, then converted into electromagnetic waves emitted by a tool called Antenna, to be sent over long distances.
4. Receiver: receives electromagnetic signals then composed into an electrical signal, the signal is converted into the corresponding original information of the sender, then processed to be understood by the people in accordance with the submitted.

c. Analog and digital

In turn information into an electrical signal that is ready to be sent, there are two ways of shipping used. The first is an analog signal, change the shape of the information to an analog signal where the signals are continuous electrical wave form (continuous) then sent by the transmission medium. The second is a digital signal, after which the information is converted into an analog signal is then converted again into an intermittent signal (discrete). An intermittent signal encoded in a digital signal is a signal "0" and "1".

In sending the signal through the transmission media, analog signals are susceptible to interference, especially interference induction and weather, so that the signal at the receiver side is degraded. As for digital signal resistant to interference induction and weather, as long as no interference exceeds acceptable limits, the signal is received in the same quality with delivery.

d. The development of telecommunications systems

Since the discovery of telephone by Graham Bell, telecommunications has been growing rapidly, if not the fastest among other systems. Especially after the discovery of the transistor, integrated circuit (IC) systems, processors, and storage systems.

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