Knowledge Base

Title Authors Last Update Category
Simulating Gaussian Crosstalk for DSL Testing Timothy R. Clark

The presence of crosstalk is a major detriment to the performance of Digital Subscriber Line (DSL) transceivers. It is therefore important to test performance under a wide variety of crosstalk scenarios. This thesis presents the development of a crosstalk noise generation system as a tool for DSL performance testing. Where many commercially available solutions are limited to specific testing needs, the system presented here is universal and can simulate virtually any noise scenario conceivable for DSL deployment.
Several requirements for the accurate frequency domain modeling of DSL crosstalk are presented. The time domain properties of crosstalk were also studied with particular attention paid to the amplitude distribution. The importance of a Gaussian amplitude distribution and the limiting effect of a finite-length pseudo-random crosstalk sequence on the "tail" of the Gaussian distribution were investigated. A method of forcing finite-length crosstalk sequences to have a "near-Gaussian" amplitude distribution is proposed.

June 27, 2012 Theses
ADSL Tutorial Matthew Langlois (UNH-IOL)

This tutorial provides an overview of ADSL technology and focuses on the physical layer as defined in ANSI T1.413-1998. From the introduction: "The demand for high-speed data networks in the "last mile" has driven the need for robust, interoperable, and easy to use multi-vendor Digital Subscriber Line (DSL) access solutions. DSL collectively refers to a group of technologies that utilize the unused bandwidth in the existing copper access network to deliver high-speed data services from the distribution center, or central office, to the end user. DSL technology is attractive because it requires little to no upgrading of the existing copper infrastructure that connects nearly all populated locations in the world. In addition, DSL is inherently secure due to its point-to-point nature."

June 26, 2012 Tutorials
ADSL Systems - An Overview Praveen Reguraman (UNH-IOL)

An overview of ADSL systems that includes network architecture, protocol architecture, typical ADSL implementations, RFC1483 bridging, PPP over ATM over ADSL, and PPP over Ethernet over ADSL.

June 26, 2012 Tutorials
ITU-T G.994.1 (G.hs) Handshake Procedures for DSL Transceivers Lincoln Lavoie (UNH-IOL)

This presentation provides an overview the ITU-T G.994.1 (G.hs) Handshaking Procedures for Digital Subscriber Line Transceivers standard. The overview covers the physical layer modulation (DPSK), frame structures, message structures, and parameter encoding. The presentation also includes examples of the differential encoding used for the modulation, and the delimiting bits used within the parameter tree.

June 26, 2012 Tutorials
Broadband Forum Kieffer Quitayen

Broadband Forum is an international industry consortium of nearly 200 leading service providers, equipment manufacturers and other interested parties, focused on developing the full potential of broadband DSL to meet the needs of the mass market.

June 26, 2012 External Links
Voice over DSL (An Overview) Deirdre Dinan, Mike Littlefield (UNH-IOL)

This presentation provides an overview and introduction to Voice over DSL (VoDSL) technologies. The presentation covers the basics of channels voice over DSL, Voice over ATM (VoATM) and Voice over IP (VoIP). The presentation also includes a quick introduction to BLES, which is used to transport voice of AAL2 over ATM.

June 26, 2012 Tutorials
Fundamentals of DSL Technology Philip Golden, Herve Dedieu, Krista S. Jacobsen

From back of book: "Fundamentals of DSL Technology... combines the strengths of the field's most renowned DSL experts, providing a foundation of all aspects of DSL system design."

June 26, 2012 Recommended Textbooks
PPP Design, Implementation, and Debugging, Second Edition James Carlson

From the back cover: "PPP Design, Implementation, and Debugging, Second Edition, is a complete and convenient resrouce for netowrk system designers and administrators. This book contains everything you need to know to work with the Point-to-Point Protocol (PPP), one of the most important Internet protocols in use today. Inside you'll find clear explanations of the underlying concepts, practical implementation information, and valuable debugging techniques to keep your PPP connections running smoothly, efficiently, and uninterrupted."

June 26, 2012 Recommended Textbooks
DSL: Simulation Techniques and Standards Development for Digital Subscriber Line Systems Dr. Walter Y. Chen

From the back cover: "Digital Subscriber Line technology heralds the age of digital communication, providing a faster, more efficient method of transmitting data over regular telephone lines. The widespread adoption of DSL technology increases the demand for subject-specific, in-depth knowledge of this breakthrough in digital communication. DSL: Simulation Techniques and Standards Development for Digital Subscriber Line Systems arms the communications and networking engineer with the quintessential information for implementing DSL systems . . . "

June 26, 2012 Recommended Textbooks
Newton Harry Newton with Ray Horak contributing editor

From the back cover: "I wrote this book for those of us in the world's most exciting industries - telecommunications, networking and the Internet. I deliberately didn't write a book that only geeks could understand. I wrote a business book that you and I could understand. I explain the technical concepts in non-technical , business language that anyone in business (whether buying, selling or investing) should be able to understand. Some of my definitions are short. Some are encyclopedic. My focus is 720 practical. What the term means. What the technology does. What benefits the technology confers. which pitfalls to watch for. Use this book in your day-to-day business life. Dip into it before a meeting with a vendor, a customer, a broker or a boss. I've got 19 years in this book. My readers and my contributing editor, Ray Horak, have contributed enormously over the years. By now, all of us have made this dictionary pretty darn good. I'm proud of this edition."

June 26, 2012 Recommended Textbooks