In the present era, we can not imagine a world without telephone calls, fax, e-mails, text messaging and even video calling. As technology becoming superior day by day, the means of communication that we are using make it possible for us to send instant messages back and forth. Any form of transmission, emission, or reception of signs, signals, writings, images, sounds, or information by means of wire, radio, visual, or other electromagnetic systems for communication purposes is known as Telecommunication or Telecom. Wireless, landline, cellular phones, cable, satellite phones, voice over Internet protocol (VoIP) and the Internet are the modern forms of telecom. TV, Radio and networks are some most common and well known examples of telecom.
Telecom systems consist of three fundamental elements:
1. Transmitter: It takes information and converts it to a signal
2. Transmission medium: It carries the signal
3. Receiver: It receives the signal and converts it back into usable form
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