Ch+4+Interface+Standards

Ch+4+Interface+Standards - Chapter Four Making Connections...

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Chapter Four Making Connections Data Communications and Computer Networks: A Business User’s Approach, Fourth Edition
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2 Key Discussion Questions for Chapter 4 What are the major components of interface standards? How do USB and EIA-232F interfaces work? What are the advantages of FireWire, SCSI, iSCSI, InfiniBand, and Fibre Channel interfaces? What are the differences among asynchronous, synchronous, and isochronous data link interfaces?
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3 Other Key Chap. 4 Questions What are the differences between half-duplex and full-duplex connections? What are the operating characteristics of terminal-to-mainframe connections and why they are unique compared to other types of computer connections?
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4 Major Types of Data Communication Interfaces Software to software interfaces E.g. APIs that enable applications to run on NOS. Software to hardware interfaces E.g. device drivers Hardware to hardware interfaces The major focus of this chapter
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5 Evolution of Interfaces The interface between a computer and a peripheral device occurs primarily at the physical layer In the past, connecting peripheral devices to a computer was a fairly challenging task Newer interfaces have made this task much easier
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6 Interfacing a Computer to Peripheral Devices The actual connection to a peripheral is often called the interface The process of providing all the proper interconnections between a computer and a peripheral is called interfacing
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7 Characteristics of Interface Standards There are essentially two types of standards Official standards Created by standards-making organizations such as ITU (International Telecommunications Union), IEEE (Institute for Electrical and Electronics Engineers), EIA (Electronic Industries Association), ISO (International Organization for Standardization), and ANSI (American National Standards Institute) De facto standards Created by other groups that are not official standards but because of their widespread use, become “almost” standards
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8 Characteristics of Interface Standards There are four possible components to an interface standard: Electrical component Mechanical component Functional component Procedural component
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9 Characteristics of the Four Interface Components Four components Electrical component – deals with voltages, line capacitance, and other electrical characteristics Mechanical component – deals with items such as the connector or plug description Functional component – describes the function of each pin or circuit that is used in a particular interface Procedural component – describes how the particular circuits are used to perform an operation
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10 Two Important Interface Standards In order to better understand the four components of an interface, we will examine two popular interface standards EIA-232F – an older standard originally designed to connect a modem to a computer USB (Universal Serial Bus) – a newer standard that is much more powerful than EIA-232F
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Ch+4+Interface+Standards - Chapter Four Making Connections...

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