commtech[5] - IS 3413 Introduction to Telecommunications...

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1 IS 3413 – Introduction to Telecommunications for Business Instructor: Yoris A. Au, Ph.D. Data Communications Basics Part 4
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2 Chapter 12 Access and Interconnection Technologies
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3 Topics Covered 12.1 Introduction 12.2 Internet Access Technology: Upstream and Downstream 12.3 Narrowband and Broadband Access Technologies 12.4 The Local Loop and ISDN 12.5 Digital Subscriber Line (DSL) Technologies 12.6 Local Loop Characteristics and Adaptation 12.7 The Data Rate of ADSL 12.8 ADSL Installation and Splitters 12.9 Cable Modem Technologies 12.10 The Data Rate of Cable Modems 12.11 Cable Modem Installation 12.12 Hybrid Fiber Coax
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4 Topics Covered 12.13 Access Technologies That Employ Optical Fiber 12.14 Head-End and Tail-End Modem Terminology 12.15 Wireless Access Technologies 12.16 High-Capacity Connections at the Internet Core 12.17 Circuit Termination, DSU\|/\|CSU, and NIU 12.18 Telephone Standards for Digital Circuits 12.19 DS Terminology and Data Rates 12.20 Highest Capacity Circuits (STS Standards) 12.21 Optical Carrier Standards 12.22 The C Suffix 12.23 Synchronous Optical NETwork (SONET)
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5 12.1 Introduction This chapter concludes the discussion of data communications by examining two facilities used in the Internet discusses access technologies, such as dialup, DSL, and cable modems considers high-capacity digital circuits used in the core of the Internet expands the discussion of the telephone system multiplexing hierarchy gives examples of circuits that common carriers offer to businesses and ISPs focuses on the data communications aspects of the technologies by considering multiplexing and data rates
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6 12.2 Internet Access Technology: Upstream and Downstream Internet access technology refers to a data communications system that connects an Internet subscriber to an ISP such as a telephone company or cable company How is access technology designed? Most Internet users follow an asymmetric pattern a subscriber receives more data from the Internet than sending a browser sends a URL that comprises a few bytes in response, a web server sends content Downstream to refer to data traveling from an ISP in the Internet to a subscriber Upstream to refer to data traveling from a subscriber to an ISP Figure 12.1 illustrates the definitions
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12.2 Internet Access Technology: Upstream and Downstream 7
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8 12.3 Narrowband and Broadband Access Technologies A variety of technologies are used for Internet access They can be divided into two broad categories based on the data rate they provide Narrowband Broadband In networking terms, network bandwidth refers to data rate Thus, the terms narrowband and broadband reflect industry practice 12.3.1 Narrowband Technologies 12.3.2 Broadband Technologies
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9 12.3 Narrowband and Broadband Access Technologies 12.3.1 Narrowband Technologies refers to technologies that deliver data at up to 128 Kbps For example, the maximum data rate for dialup noisy phone lines is 56 Kbps and classified as a narrowband technology Figure 12.2 (below) summarizes the main narrowband access technologies
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This note was uploaded on 01/26/2012 for the course IS 3413 taught by Professor Staff during the Fall '08 term at The University of Texas at San Antonio- San Antonio.

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commtech[5] - IS 3413 Introduction to Telecommunications...

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