Synchronous and Asynchronous Communication Systems

Synchronous and Asynchronous Communication Systems

António D. Reis (Universidade da Beira Interior, Portugal and Universidade de Aveiro, Portugal), José F. Rocha (Universidade de Aveiro, Portugal), Atilio S. Gameiro (Universidade de Aveiro, Portugal) and José P. Carvalho (Universidade da Beira Interior Covilhã, Portugal)
Copyright: © 2008 |Pages: 10
DOI: 10.4018/978-1-59904-885-7.ch210
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Abstract

This article talks generically about telecommunication systems. A telecommunication system involves a transmitter, a transmission medium, and a receiver. The type of communication between the transmitter and the receiver can be the synchronous transmission mode or the asynchronous transmission mode. Synchronous communication is sending data with synchronization to an external clock. The most significant aspect of synchronous communication is that the transmitter and receiver clocks are dependent and synchronized. The synchronous communication is a transmission technique that is widely used in telecommunications. Asynchronous communication is sending data without synchronization to an external clock. The most significant aspect of asynchronous communication is that the transmitter and receiver clocks are independent and are not synchronized. The synchronous communication is a transmission technique, which is widely used in personal computers, providing connectivity to printers, modems, fax machines, and so forth.

Key Terms in this Chapter

DC (Direct Current): A designation for continous voltage.

LAN (Local Area Network): A network of local area that connects systems in a small geographic area (a city).

PLL (Phase Lock Loop): A device that generically synchronizes its VCO phase with the input deterministic signal, for example, a wave.

WAN (Wide Area Network): A network of wide area that connects systems in a large geographic area (a country).

WPLL (Wave Phase Lock Loop): Another designation for the PLL which is more expressive.

VCO (Voltage Controlled Oscillator): A device whose output frequency is controlled by the input voltage.

MAN (Metropolitan Area Network): A network of metropolitan area that connects systems in a medium geographic area (a province).

AC (Alternate Current): A designation for alternate voltage.

SLL: (Symbol Lock Loop): A device that generically synchronizes its VCO phase with the input random signal, for example, data or symbols.

SPLL (Symbol Phase Lock Loop): Another designation for the SLL which is more expressive.

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