TAILIEUCHUNG - lecture 2: Communication Concepts

Parallel: In parallel transmission all bits in a single character are transmitted simultaneously. Data travels in parallel (simultaneously) within a PC over the data bus (bundle of data lines). Similarly we can transmit data between two PCs in parallel. That is all data lines (normally 8) from one PC are connected to the other PC. Parallel transmission is primarily limited to transmission of data within a computer, between computers and between a computer and a printer. It is fast compared to serial transmission but limited to shorter distances. . | CSN200 Introduction to Telecommunications, Winter 2000 Lecture_02 Communication Concepts Data Transmission Modes: There are three ways in which data can flow in a circuit: one way only, one way at a time or both directions simultaneously. Simplex Data can flow in only one direction. Examples are radio, TV, computer to printers, public address systems or any other unidirectional transmission. Half-Duplex Data flows in only one direction at a time. It is sometimes called two-way alternate. Communication occurs in one direction and then the line is “turned around” and information flows in the other direction. CB radio is half-duplex. Full Duplex Data flows in both directions at the same time. Most modem connections today transmit full duplex increasing efficiency with data flowing on the same pair of wires in both directions simultaneously. ZD Webopaedia: Information Factory: lecture Page 1 (3) CSN200 Introduction to Telecommunications, Fall 1999 Lecture_02 Parallel vs. Serial Transmission: Parallel: In parallel transmission all bits in a single character are transmitted simultaneously. Data travels in parallel (simultaneously) within a PC over the data bus (bundle of data lines). Similarly we can transmit data between two PCs in parallel. That is all data lines (normally 8) from one PC are connected to the other PC. Parallel transmission is primarily limited to transmission of data within a computer, between computers and between a computer and a printer. It is fast compared to serial transmission but limited to shorter distances. It sends data bits in parallel (typically 8 bits at a time) using separate wires or circuits for each bit. This “byte-wide” transmission is faster than serial transmission but requires more wires in the cable and can not be used over long distances. It is not used very often in data communications but is used extensively for computer busses .

• Thư viện thông tin
• Communication Concepts
• Simplex
• Half Duplex
• Parallel vs
• Serial Transmission
• Lecture Operating system concepts
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