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Optical Networks: Third Generation Transport Systems

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Optical Networks: Third Generation Transport Systems

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Description

  • Copyright 2002
  • Edition: 1st
  • Book
  • ISBN-10: 0-13-060726-6
  • ISBN-13: 978-0-13-060726-3

A comprehensive introduction to optical networking: current solutions and emerging breakthroughs.

  • The authoritative, comprehensive guide to next-generation optical networking
  • Coverage includes DWDM, Optical-over-IP, MPLS, passive optical, ASON, and OLMP
  • Presents new techniques for maximizing bandwidth, simplifying provisioning, and controlling QoS
  • Includes a detailed review of current fiber systems, signaling schemes, and SONET/SDH standards

In Optical Networks: Third Generation Transport Systems, leading telecom consultant Uyless Black presents an authoritative introduction to the emerging technologies that will drive the next communications revolution. From MPLS to Optical-over-IP to the new Optical Link Management Protocol (OLMP), Black's expert explanations and practical insight will be invaluable to every professional building, deploying, or managing optical networks. Engineers new to the field will especially appreciate his review of current fiber systems, signaling, SONET/SDH standards, and how these technologies lay the foundation for tomorrow's 3G advances.

  • DWDM: Driving massive bandwidth increases through existing optical infrastructure
  • MPLS: understanding its role in today's networks and tomorrow's optical core
  • Controlling QoS in current and future optical networks
  • Network topologies and protection/restoration—including advanced passive optical systems
  • Optical routers, switching in optical Internets, and optical bandwidth-on-demand
  • ASON: Automating the routing and signaling of optical connections
  • OLMP: Simplifying the configuration and management of tomorrow's optical networks
  • Comparing ATM with IP in optical networks

Optical Networks: Third Generation Transport Systems is the first book to cover every key optical technology for building networks of unprecedented power, flexibility, and manageability.

Sample Content

Online Sample Chapter

Optical Networks: Capacity and Components

Table of Contents



Preface.


1. Introduction.

Three Generations of Digital Transport Networks. All Features Are Not Yet Available. Optical Fiber Capacity. A Brief Introduction to WDM and TDM. Combining WDM and TDM. The Optical Marketplace. The Local Loop Bottleneck Must Be Solved. Expansion of Network Capacity. Wireless Optical Systems. Key Optical Nodes. Key Terms for the Cross-connect. Other Key Terms. Another Look at the Optical Node. Evolution of Optical Systems. Key Attributes of Optical Fiber. Summary.



2. The Telecommunications Infrastructure.

The Local Connections. The Backbone Connections. The Digital Multiplexing Hierarchy. The Digital Signaling Hierarchies. T1 or DS1; T3 or DS3? The Layered Protocol Model in the Transport Network. Considerations for Interworking Layer 1, Layer 2, and Layer 3 Networks. Summary.



3. Characteristics of Optical Fiber.

The Basics. The Wavelength. The Basic Components. The Source of the Signal. The Detector. Structure of the Fiber. Angles. Fiber Types. Key Performance Properties of Fiber. Attenuation. Amplifier Spontaneous Emission (ASE). Chromatic Dispersion. Polarization-mode Dispersion (PMD). Lasers. Summary.



4. Timing and Synchronization.

Timing and Synchronization in Digital Networks. Effect of a Timing Error. The Clocking Signal. Types of Timing in Networks. The Synchronous Clock Hierarchy. Timing Variations. Frequency Accuracy. Methods of Clock Exchange. Free-Running. Line-Timed. Loop-Timed. External. Through-Timed. Distribution of Timing Using SONET and DS1. Timing Downstream Devices. The Building Integrated Timing Supply (BITS). Synchronization Status Messages (SSMs) and Timing Loops. Summary.



5. SONET and SDH.

How SONET and SDH Came into Being. Participation by ITU-T. Reasons for Success of SONET/SDH. The SONET Multiplexing Hierarchy. SONET and SDH Multiplexing Structure. The SONET/SDH Frame Structure. Rationale for the 51.840 Mbit/s Envelope. Overhead and User Areas in the Envelope. SONET and SDH Functional Components. SONET and SDH Problem Detection. Locating and Adjusting Payload with Pointers. Virtual Tributaries in More Detail. Virtual Tributaries and Virtual Containers. The Overhead Bytes. SONET and SDH Concatenation. Summary.



6. Architecture of Optical Transport Networks (OTNs).

The Digital Wrapper. Control Planes. In-band and Out-of-band Control Signaling. An In-band Signal on an O/O/O PXC. Importance of Multiplexing and Multiplexing Hierarchies. Current Digital Transport Hierarchy. SONET Multiplexing Hierarchy. SDH Multiplexing Hierarchy. Revised SDH Transport Hierarchy. Key Indexes and Other Terms. The New Optical Transport and Digital Transport Hierarchy. ODUk Mapping and Multiplexing. The OTN Layered Model. Another View. Full Functionality Stack: OTM-n.m. Reduced Functionality Stack: OTM-nr.m and OTM-0.r. Encapsulation and Decapsulation Operations. Generic Framing Procedure (GFP). Summary.



7. Wavelength Division Multiplexing (WDM).

The WDM Operation. Dense Wave Division Multiplexing (DWDM). TDM and WDM Topologies. Relationship of WDM to SONET/SDH. Erbium-doped Fiber (EDF). WDM Amplifiers. Gain Flatness. Add-Drop Multiplexers. WADM Input and Output Ports. WDM Cross-connects. Wavelength Continuity Property. Example of DWDM Wavelength Plan. Average Versus Maximum Span Loss and Chromatic Dispersion. Higher Dispersion for DWDM. Tunable DWDM Lasers. Summary.



8. Network Topologies and Protection Schemes.

The Non

Preface

Preface

This book describes third generation digital carrier transport networks. The primary focus of the book is on the role of optical fiber and optical routers in these networks, with the emphasis on wave division multiplexing (WDM). Third generation transport networks also entail considerable interworking with Multiprotocol Label Switching (MPLS), and this topic is covered in several chapters. As well, the ITU and the IETF are defining new multiplexing hierarchies for the third generation transport network, and these efforts are described in this book.

You might be wondering what are first and second generation transport networks? I classify first generation systems, introduced in the 1960s, as those that were/are built with predominately T1 and E1 architectures. I classify second generation systems, introduced in the 1980s, as those that were/are built with SONET and SDH architectures. Although these topics are covered in this book, the emphasis is on networks that go beyond these older technologies.

The emphasis of this book is on newer technologies, being introduced as you read this preface, with the focus on optical internets: those dealing with IP over optical; label switching with WDM; optical cross-connects; optical routers; optical bandwidth on demand; and the emerging Optical Transport Network (OTN), published by ITU-T and amplified by the IETF. For the newcomer, Chapter 3 provides tutorials on the basics of optical technology, including the operations of optical fiber and lasers.

I want to emphasize that this book has only one chapter on the technology of optical fiber itself. Scores of books are available on this subject, and my intent is to move beyond the descriptions of a light signal on a fiber. I think Chapter 3 will be sufficient for the newcomer on the subject of optical fiber, and I provide you with some excellent references if you wish to delve into more details about the subject.

Internet Drafts: Work In Progess

A considerable portion of this book is devoted to explaining many Internet-based specifications pertaining to IP-based optical networks.

Keep in mind that the Internet drafts are works in progress, and should be viewed as such. You should not use the drafts with the expectation that they will not change. Notwithstanding, if used as general tutorials, the drafts discussed in this book are "final enough" to warrant their explanations. Indeed, many of my clients use these drafts in their product planning and design.

For all the Internet standards and drafts the following applies:

Copyright © The Internet Society (1998). All Rights Reserved.

This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.

The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.

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