CE-3 - The Chinese University of Hong Kong Department of...

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1 The Chinese University of Hong Kong Department of Electronic Engineering Experiment CE-3: Data Communication Basics OBJECTIVES 1) To study different coding and decoding methods for common data codes. 2) To explain and demonstrate the effects of noise on the data communication. APPARATUS (1) A Lab-Volt F.A.C.E.T. Base Unit and DIGITAL COMMUNICATIONS 2 Circuit Board. (2) A Computer installed with Tech-Lab System and Utilities. (3) An oscilloscope and a multimeter. INTRODUCTION LINE CODING UNIT OBJECTIVE Describe coding and decoding methods for common data codes. UNIT FUNDAMENTALS In baseband data transmission, the message signal containing the data is transmitted directly through the transmission channel. Binary data is often encoded into a series of pulses. The digital circuitry inside a computer often uses +5V for a 1 state (mark) and 0V (space) for a 0 state. When data communications concerns the transmission of data from one location to another, the data is commonly encoded.
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2 There are many types of line codes in use such as AMI, RZ, NRZ, and Manchester. Choice of a line code is judged by trade-offs between frequency response, bandwidth, clocking content, and dc drift. A line code that is used in the T1-Digital Transmission System is called the alternate mark
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CE-3 - The Chinese University of Hong Kong Department of...

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