Ch.8 - Fundamentals of Communication

Ch.8 Fundamentals - CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 1 Information Technology in Theory By Pelin Aksoy and Laura DeNardis Chapter 8

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3/16/2010 1 CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 1 Information Technology in Theory By Pelin Aksoy and Laura DeNardis Chapter 8 Fundamentals of Communications CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 2 Objectives ± Understand how binary streams are physically generated ± Learn how carriers are modulated to carry the binary streams ± Understand important transmission concepts, including attenuation, bandwidth, channel capacity, 2 and multiplexing Information Technology in Theory
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3/16/2010 2 CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 3 Objectives (continued) ± Learn the properties of different types of transmission ± Learn the properties of different types of transmission media ± Identify sources of transmission errors and learn about error detection and correction techniques for digital transmission systems 3 Information Technology in Theory CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 4 Electrical Signaling ± Electrical signals transmitted through conducting Electrical signals transmitted through conducting materials, such as metal wires, effectively transmit both analog and digital information ± Metallic conductors , such as copper wires, comprise atoms with loosely attached electrons, or negatively charged particles, around their nuclei 4 charged particles, around their nuclei Information Technology in Theory
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3/16/2010 3 CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 5 Electrical Signaling (continued) ± When a voltage/potential difference from an electrical source such as a battery is introduced between the source, such as a battery, is introduced between the two ends of a conductor, the electrons are stimulated to move within the metal from one atom to another ± The relationship between voltage (V), current (I), and resistance (R) is defined by Ohm’s Law : V = IR 5 Information Technology in Theory CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 6 Electrical Signaling (continued) 6 Information Technology in Theory
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3/16/2010 4 CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 7 Analog and Digital Signaling ± When analog signals are transmitted across a conductor, a continuous voltage difference proportional to the amplitude of the analog signal is applied at the input of the communications circuit ± The current flowing through the circuit is proportional to the applied voltage according to 7 Ohm’s law, as there is a resistance associated with the circuit Information Technology in Theory CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 8 Analog and Digital Signaling (continued) ± One method for sending digital information across a communication system is called binary signaling communication system is called ± An alternative method to sending digital information across a communication system is 4-ary signaling ± The 4-ary signaling may be generalized to M-ary signaling 8 ± The data rate (D) in bits per second for M-ary transmission can be calculated by the following: D = R log 2 M Information Technology in Theory
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This note was uploaded on 10/05/2010 for the course CIS CIS 3003 taught by Professor K during the Spring '10 term at University of Central Florida.

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Ch.8 Fundamentals - CIS 3001 INTRODUCTION TO INFORMATION TECHNOLOGY 1 Information Technology in Theory By Pelin Aksoy and Laura DeNardis Chapter 8

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