tailieunhanh - NETWORK+ GUIDE TO NETWORKS, FOURTH EDITION - CHAPTER 3

Transmission Basics and Networking Media Explain basic data transmission concepts, including full duplexing, attenuation, and noise Describe the physical characteristics of coaxial cable, STP, UTP, and fiber-optic media Compare the benefits and limitations of different networking media Identify the best practices for cabling buildings and work areas Specify the characteristics of popular wireless transmission methods, including , infrared, and Bluetooth | NETWORK+ GUIDE TO NETWORKS, FOURTH EDITION Chapter 3 Transmission Basics and Networking Media Network+ Guide to Networks, 4e OBJECTIVES Explain basic data transmission concepts, including full duplexing, attenuation, and noise Describe the physical characteristics of coaxial cable, STP, UTP, and fiber-optic media Compare the benefits and limitations of different networking media Identify the best practices for cabling buildings and work areas Specify the characteristics of popular wireless transmission methods, including , infrared, and Bluetooth Network+ Guide to Networks, 4e TRANSMISSION BASICS In data networking, transmit means to issue signals to the network medium Transmission refers to either the process of transmitting or the progress of signals after they have been transmitted Network+ Guide to Networks, 4e ANALOG AND DIGITAL SIGNALS Information transmitted via analog or digital signals Signal strength proportional to voltage In analog signals, . | NETWORK+ GUIDE TO NETWORKS, FOURTH EDITION Chapter 3 Transmission Basics and Networking Media Network+ Guide to Networks, 4e OBJECTIVES Explain basic data transmission concepts, including full duplexing, attenuation, and noise Describe the physical characteristics of coaxial cable, STP, UTP, and fiber-optic media Compare the benefits and limitations of different networking media Identify the best practices for cabling buildings and work areas Specify the characteristics of popular wireless transmission methods, including , infrared, and Bluetooth Network+ Guide to Networks, 4e TRANSMISSION BASICS In data networking, transmit means to issue signals to the network medium Transmission refers to either the process of transmitting or the progress of signals after they have been transmitted Network+ Guide to Networks, 4e ANALOG AND DIGITAL SIGNALS Information transmitted via analog or digital signals Signal strength proportional to voltage In analog signals, voltage varies continuously and appears as a wavy line when graphed over time Wave’s amplitude is a measure of its strength Frequency: number of times wave’s amplitude cycles from starting point, through highest amplitude and lowest amplitude, back to starting point over a fixed period of time Measured in Hz Network+ Guide to Networks, 4e ANALOG AND DIGITAL SIGNALS (CONTINUED) Wavelength: distance between corresponding points on a wave’s cycle Phase: progress of a wave over time in relationship to a fixed point Analog transmission susceptible to transmission flaws such as noise Digital signals composed of pulses of precise, positive voltages and zero voltages Positive voltage represents 1 Zero voltage represents 0 Network+ Guide to Networks, 4e ANALOG AND DIGITAL SIGNALS (CONTINUED) Binary system: uses 1s and 0s to represent information Easy to convert between binary and decimal Bit: a single binary signal Byte: 8 bits Typically represents one piece of information Overhead: describes