In a mobile communication system, a radio channel has to be shared by a number of users.Since it is a broadcasting system, many receivers receive the information. A reverse of this transformation – converting the high-frequency signal into an audio signal – is performed at the receiving station. The modem converts the digital signals generated by the computer into analog form for transmission over the medium at the transmitting end and the reverse at the receiving end.īasic Telecommunication System In the case of a radio communication system for broadcasting audio programs, the electrical signal is transformed into a highfrequency signal and sent through the air (free space). Two computers can communicate with each other through the telephone network, using a modem at each end.
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However, due to the signal attenuation, the distance cannot be more than 100 meters.
Serial communication basics serial#
Note: The serial ports of two computers can be connected directly using a copper cable. The objective of designing a communication system is to reproduce the electrical signal at the receiving end with minimal distortion. In addition, the transmission medium introduces noise and, as a result, the signal gets distorted. Note: As the electrical signal passes through the transmission medium, the signal gets attenuated. At the receiving side, a transducer converts the electrical signal back into real-life information In an electrical communication system, at the transmitting side, a transducer converts the real –life information into an electrical signal.
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Relatively low-speed voice-band data communications modems such as those found in most personal computers.Digital Communications – Include systems where relatively high-frequency analog carriers are modulated by relatively lowfrequency digital signals (digital radio) and systems involving the transmission of digital pulses (digital transmission).Digital Modulation – The transmittal of digitally modulated analog signals (carriers) between two or more points in a communications systems – Sometimes referred to as digital radio because digitally modulated signals can be propagated through Earth’s atmosphere and used in wireless communications systems.Information – Knowledge or intelligence that is communicated (i.e., transmitted or received) between two or more points.Electronic Communication – The transmission, reception, and processing of information with the use of electronic circuits.