TAILIEUCHUNG - Lecture Business data communications: Chapter 6 - Behrouz A. Forouzan

Chapter 6 - Physical layer. In this chapter, we study the duties of the physical layer, first as a converter that converts data to signals, then as a manager that controls the medium. After reading this chapter, the reader should be able to: Distinguish between analog and digital data, distinguish between analog and digital signals, understand the concept of bandwidth and the relationship between bandwidth and data transmission speed,. | Chapter 6 Physical Layer Distinguish between analog and digital data. Distinguish between analog and digital signals. Understand the concept of bandwidth and the relationship between bandwidth and data transmission speed. Understand digital-to-digital, digital-to-analog, and analog-to- digital encoding. After reading this chapter, the reader should be able to: OBJECTIVES Understand multiplexing and the difference between a link and a channel. DIGITAL AND ANALOG Figure 6-1 Digital and analog entities Figure 6-2 Digital data Figure 6-3 Analog data Figure 6-4 Digital signal Figure 6-5 Bit and bit interval Technical Focus: Units of Bit Rate 1 bps 1 kbps = 1000 bps 1 Mbps = 1,000,000 bps 1 Gbps = 1,000,000,000 bps 1 Tbps = 1,000,000,000,000 bps Figure 6-6 A sine wave Figure 6-7 Amplitude Figure 6-8 Period and frequency Technical Focus: Units of Frequency 1 Hz 1 kHz = 1000 Hz 1 MHz = 1,000,000 Hz 1 GHz = 1,000,000,000 Hz 1 THz = 1,000,000,000,000 Hz Technical Focus: Frequency and .

• Quản trị mạng
• Business data communications
• Data communications
• Business data communications
• Physical layer
• Transforming data to signals
• Transmission modes
• Data link layer
• Network criteria
• Data communications system
• Data communications networks
• Media access control
• Network models
• Network standards
• Application layer
• Application architectures
• 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