Understanding Digital Subscriber Line Technology
Understanding Digital Subscriber Line Technology
Overview
Visionaries have spoken of a future where the common person has instantaneous access to data spread around the globe. Engaging in a live videoconference, or perhaps watching a personalized newscast are just two of examples of many. For this vision to become reality, a global broadband information infrastructure must be built that provides low-cost access to the consumers and sources of information. What connects to virtually every home and business in the industrialized world? Phone lines connect to 700 million sites today. Data rates of several kilobits per second are possible over phone lines using dial-up modems. This is enough to spark the appetite of the Internet surfer but is not nearly enough to satisfy the desire for immediate information on demand. Similarly, video and audio applications at dial-up modem data rates leave users demanding more.Digital subscriber line (DSL) technology enables high-speed digital transmission on conventional telephone lines. A global broadband information infrastructure based on telephone lines is emerging, and it relies on DSL technology. The transformation of the telephone line access has begun; it is progressing with the addition of over one billion U.S. dollars worth of DSL equipment each year. Accomplishing the impossible is an engineer's greatest reward. Digital subscriber line development has been most rewarding. In 1975, it was believed that 20 kb/s was the highest data rate that could be transmitted via telephone lines. Then, breakthrough concepts in digital transmission were enabled by enormous advances in very-large-scale integrated (VLSI) circuits and digital signal processing (DSP). Transceiver designs of breathtaking complexity (at that time) provided 144 kb/s basic rate ISDN (BRI) transport via most telephone lines. Experts then said that this was very near the capacity limit of telephone lines. This barrier was demolished by the 1.5 Mb/s high bit rate DSL (HDSL). The breakthrough cycle was repeated by 6 Mb/s asymmetric DSL (ADSL), and then 52 Mb/s very-high bit rate DSL (VDSL).This book explains and details the key concepts for DSL technology and its applications. The reader will attain a strong familiarity with the crucial aspects and technical jargon of the DSL field. The scope encompasses applications, network architecture, network management, network operations, communications protocols, standards, regulatory issues, and the underlying technologies. This book was written to assist engineers and marketing managers - whether new to DSLs or experts in need of a convenient reference. Background regarding voice-band transmission via telephone lines may be found in the excellent books by Witham Reeves on subscriber loops.AcknowledgmentsThe authors thank Jim Loehndorf for assistance with the sections on data communications protocols, and Kim Maxwell for providing his input regarding voice-band modems and other sections.The authors would also like to sincerely thank Dr. Kiho Kim, Richard Goodson, and Dr. Martin Pollakowski for their review of this material and their helpful comments and suggestions.The second author, John Cioffi, especially would like to thank the following people (in alphabetical order) for their significant discussions and direct assistance on specific topics of this book: Mike Agah, John Bingham, Jacky Chow, Peter Chow, John Cook, Joice DeBolt, Kevin Foster, Mathias Friese, Richard Goodson, Werner Henkel, Atul Salvekar, Jose Tellado, Po Tong, Craig Valenti, Jean-Jacques Werner, and George Zimmerman. He further wishes to thank Dr. Joe Lechleider for enticing him into DSL in 1987, and thanks beyond measure the outstanding technical staff of Amati (1989-1997, now Texas Instruments), and the first to believe: his past and present students at Stanford.Thanks also go out to Steve Blackwell and Kevin Schneider of Adtran, who kindly offered the use of their good summary of HDSL2 work in the T1E1.4 Working Group. The first author, Tom Starr, has had the pleasure of chairing the T1E1.4 Working Group for over ten years. Thanks to the professionalism, dedication, and expertise of its members, T1E1.4 has done more than merely write the industry's DSL standards. Multidisciplinary collaboration has allowed T1E1.4 to set the industry's objectives and chart the course to meeting these objectives. There have been moments of agony and disappointment but, on the whole, serving as T1E1.4 chair has been rewarding. Thank you, members of T1E1.4, for being the world's foremost creators of DSL technology.The views expressed in this book are those of the authors and do not necessarily reflect the views of their employers or the organizations in which the authors hold office.Thomas Starr John M. Cioffi Peter SilvermanDescription
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- Used - Good: All pages and cover are intact (including the dust cover, if applicable). Spine may show signs of wear. Pages may include limited notes and highlighting. May include "From the library of" labels. Shrink wrap, dust covers, or boxed set case may be missing. Item may be missing bundled media.
- Used - Acceptable: All pages and the cover are intact, but shrink wrap, dust covers, or boxed set case may be missing. Pages may include limited notes, highlighting, or minor water damage but the text is readable. Item may but the dust cover may be missing. Pages may include limited notes and highlighting, but the text cannot be obscured or unreadable.
Note: Some electronic material access codes are valid only for one user. For this reason, used books, including books listed in the Used – Like New condition, may not come with functional electronic material access codes.
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You may return most items within 30 days of delivery for a full refund.
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Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.
Additional non-returnable items:
- Gift cards
- Downloadable software products
- Some health and personal care items
To complete your return, we require a tracking number, which shows the items which you already returned to us.
There are certain situations where only partial refunds are granted (if applicable)
- Book with obvious signs of use
- CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error
- Any item that is returned more than 30 days after delivery
Items returned to us as a result of our error will receive a full refund,some returns may be subject to a restocking fee of 7% of the total item price, please contact a customer care team member to see if your return is subject. Returns that arrived on time and were as described are subject to a restocking fee.
Items returned to us that were not the result of our error, including items returned to us due to an invalid or incomplete address, will be refunded the original item price less our standard restocking fees.
If the item is returned to us for any of the following reasons, a 15% restocking fee will be applied to your refund total and you will be asked to pay for return shipping:
- Item(s) no longer needed or wanted.
- Item(s) returned to us due to an invalid or incomplete address.
- Item(s) returned to us that were not a result of our error.
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, please Contact Us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.
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We'll pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.). In other cases, you will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
Overview
Visionaries have spoken of a future where the common person has instantaneous access to data spread around the globe. Engaging in a live videoconference, or perhaps watching a personalized newscast are just two of examples of many. For this vision to become reality, a global broadband information infrastructure must be built that provides low-cost access to the consumers and sources of information. What connects to virtually every home and business in the industrialized world? Phone lines connect to 700 million sites today. Data rates of several kilobits per second are possible over phone lines using dial-up modems. This is enough to spark the appetite of the Internet surfer but is not nearly enough to satisfy the desire for immediate information on demand. Similarly, video and audio applications at dial-up modem data rates leave users demanding more.Digital subscriber line (DSL) technology enables high-speed digital transmission on conventional telephone lines. A global broadband information infrastructure based on telephone lines is emerging, and it relies on DSL technology. The transformation of the telephone line access has begun; it is progressing with the addition of over one billion U.S. dollars worth of DSL equipment each year. Accomplishing the impossible is an engineer's greatest reward. Digital subscriber line development has been most rewarding. In 1975, it was believed that 20 kb/s was the highest data rate that could be transmitted via telephone lines. Then, breakthrough concepts in digital transmission were enabled by enormous advances in very-large-scale integrated (VLSI) circuits and digital signal processing (DSP). Transceiver designs of breathtaking complexity (at that time) provided 144 kb/s basic rate ISDN (BRI) transport via most telephone lines. Experts then said that this was very near the capacity limit of telephone lines. This barrier was demolished by the 1.5 Mb/s high bit rate DSL (HDSL). The breakthrough cycle was repeated by 6 Mb/s asymmetric DSL (ADSL), and then 52 Mb/s very-high bit rate DSL (VDSL).This book explains and details the key concepts for DSL technology and its applications. The reader will attain a strong familiarity with the crucial aspects and technical jargon of the DSL field. The scope encompasses applications, network architecture, network management, network operations, communications protocols, standards, regulatory issues, and the underlying technologies. This book was written to assist engineers and marketing managers - whether new to DSLs or experts in need of a convenient reference. Background regarding voice-band transmission via telephone lines may be found in the excellent books by Witham Reeves on subscriber loops.AcknowledgmentsThe authors thank Jim Loehndorf for assistance with the sections on data communications protocols, and Kim Maxwell for providing his input regarding voice-band modems and other sections.The authors would also like to sincerely thank Dr. Kiho Kim, Richard Goodson, and Dr. Martin Pollakowski for their review of this material and their helpful comments and suggestions.The second author, John Cioffi, especially would like to thank the following people (in alphabetical order) for their significant discussions and direct assistance on specific topics of this book: Mike Agah, John Bingham, Jacky Chow, Peter Chow, John Cook, Joice DeBolt, Kevin Foster, Mathias Friese, Richard Goodson, Werner Henkel, Atul Salvekar, Jose Tellado, Po Tong, Craig Valenti, Jean-Jacques Werner, and George Zimmerman. He further wishes to thank Dr. Joe Lechleider for enticing him into DSL in 1987, and thanks beyond measure the outstanding technical staff of Amati (1989-1997, now Texas Instruments), and the first to believe: his past and present students at Stanford.Thanks also go out to Steve Blackwell and Kevin Schneider of Adtran, who kindly offered the use of their good summary of HDSL2 work in the T1E1.4 Working Group. The first author, Tom Starr, has had the pleasure of chairing the T1E1.4 Working Group for over ten years. Thanks to the professionalism, dedication, and expertise of its members, T1E1.4 has done more than merely write the industry's DSL standards. Multidisciplinary collaboration has allowed T1E1.4 to set the industry's objectives and chart the course to meeting these objectives. There have been moments of agony and disappointment but, on the whole, serving as T1E1.4 chair has been rewarding. Thank you, members of T1E1.4, for being the world's foremost creators of DSL technology.The views expressed in this book are those of the authors and do not necessarily reflect the views of their employers or the organizations in which the authors hold office.Thomas Starr John M. Cioffi Peter SilvermanDescription
Condition Guidelines
Books - New and Used
The following guidelines apply to books:
- New: A brand-new copy with cover and original protective wrapping intact. Books with markings of any kind on the cover or pages, books marked as "Bargain" or "Remainder," or with any other labels attached, may not be listed as New condition.
- Used - Good: All pages and cover are intact (including the dust cover, if applicable). Spine may show signs of wear. Pages may include limited notes and highlighting. May include "From the library of" labels. Shrink wrap, dust covers, or boxed set case may be missing. Item may be missing bundled media.
- Used - Acceptable: All pages and the cover are intact, but shrink wrap, dust covers, or boxed set case may be missing. Pages may include limited notes, highlighting, or minor water damage but the text is readable. Item may but the dust cover may be missing. Pages may include limited notes and highlighting, but the text cannot be obscured or unreadable.
Note: Some electronic material access codes are valid only for one user. For this reason, used books, including books listed in the Used – Like New condition, may not come with functional electronic material access codes.
Shipping & Delivery
Shipping Fees
- Stevens Books offers FREE SHIPPING everywhere in the United States for ALL non-book orders, and $3.99 for each book.
- Packages are shipped from Monday to Friday.
- No additional fees and charges.
Delivery Times
The usual time for processing an order is 24 hours (1 business day), but may vary depending on the availability of products ordered. This period excludes delivery times, which depend on your geographic location.
Estimated delivery times:
- Standard Shipping: 5-8 business days
- Expedited Shipping: 3-5 business days
Shipping method varies depending on what is being shipped.
Tracking
All orders are shipped with a tracking number. Once your order has left our warehouse, a confirmation e-mail with a tracking number will be sent to you. You will be able to track your package at all times.
Damaged Parcel
If your package has been delivered in a PO Box, please note that we are not responsible for any damage that may result (consequences of extreme temperatures, theft, etc.).
If you have any questions regarding shipping or want to know about the status of an order, please contact us or email to support@stevensbooks.com.
Returns & Refunds
You may return most items within 30 days of delivery for a full refund.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.
Additional non-returnable items:
- Gift cards
- Downloadable software products
- Some health and personal care items
To complete your return, we require a tracking number, which shows the items which you already returned to us.
There are certain situations where only partial refunds are granted (if applicable)
- Book with obvious signs of use
- CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error
- Any item that is returned more than 30 days after delivery
Items returned to us as a result of our error will receive a full refund,some returns may be subject to a restocking fee of 7% of the total item price, please contact a customer care team member to see if your return is subject. Returns that arrived on time and were as described are subject to a restocking fee.
Items returned to us that were not the result of our error, including items returned to us due to an invalid or incomplete address, will be refunded the original item price less our standard restocking fees.
If the item is returned to us for any of the following reasons, a 15% restocking fee will be applied to your refund total and you will be asked to pay for return shipping:
- Item(s) no longer needed or wanted.
- Item(s) returned to us due to an invalid or incomplete address.
- Item(s) returned to us that were not a result of our error.
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, please Contact Us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.
Shipping Cost
We'll pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.). In other cases, you will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
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