TAILIEUCHUNG - Lecture Business data communications: Chapter 7 - Behrouz A. Forouzan

Chapter 7 - Transmission media. In this chapter we discuss different kinds of transmission media, their use, and their advantages and disadvantages. After reading this chapter, the reader should: Understand the difference between guided and unguided media, be familiar with twisted-pair cable and the rationale for twisting, be familiar with shielded twisted-pair cable and the rationale for shielding, be familiar with coaxial cable, understand how the air (or vacuum) can be a transmission medium for signals. | Chapter 7 Transmission Media Understand the difference between guided and unguided media. Be familiar with twisted-pair cable and the rationale for twisting. Be familiar with shielded twisted-pair cable and the rationale for shielding. Be familiar with coaxial cable. After reading this chapter, the reader should be able to: OBJECTIVES Understand how the air (or vacuum) can be a transmission medium for signals. GUIDED MEDIA Figure 7-1 Categories of guided media Figure 7-2 Twisted-pair cable A twisted pair consists of two conductors each surrounded by an insulating material. Note: Technical Focus: Why Twisted-Pair Cable Reduces Noise Interference from devices such as a motor can create unequal noise over two parallel lines. The line that is closer to the device receives more interference than the one that is farther. If however, the wires are twisted around each other at regular intervals, each wire is closer to the noise source for half of the time and farther for the other .

• Quản trị mạng
• Business data communications
• Data communications
• Business data communications
• Transmission media
• Unguided media
• Guided media
• Data link layer
• Network criteria
• Data communications system
• Data communications networks
• Media access control
• Network models
• Network standards
• Application layer
• Application architectures
• Physical layer
• Digital transmission
• Network and transport layers
• Transport layers
• Local area networks
• Traditional ethernet
• Wireless local area networks
• Wireless LANs
• Backbone networks
• Backbone network architectures
• Circuit switched networks
• Wide area networks
• Network security
• Risk assessment
• Network design
• Traditional network design
• Network management
• Configuration management