Click to enlargeIntroduction to<br>Public Switched Telephone<br>Networks, 2nd Edition<a name="top">

Authors: Lawrence Harte, Robert Flood

Number of Pages: 54
Number of Diagrams: 18




Public telephone networks are unrestricted dialing telephone networks that are available for public use to interconnect communications devices. This book describes the fundamentals of analog and digital telephone technology and communication and how the different types of analog and digital audio signals are described along with how their forms (PCM coding) differ in various parts of the world. You will learn about plain old telephone service (POTS) analog lines and integrated services digital network (ISDN) lines.

The efficient GR-303 digital loop carrier (DLC) system is described along with how remote digital terminal (RDT) can allow more....

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Table of Contents

Overview
-Local Loop
-Switching Systems
-Transmission Systems
-Numbering Plan
-Call Processing

Market Growth
-Voice Service
-Data Service

Technologies
-Public Telephone System Interconnection
-POTS (dial) Line Connections
-Direct Inward Dialing (DID) Connections
-Foreign Exchange Office (FXO)
-Foreign Exchange Station (FXS)
-Type 1 Connections
-Integrated Services Digital Network - Basic Rate Interface Connections (ISDN-BRI) -Integrated Services Digital Network - Primary Rate Interface Connections
-Type 2A Connections
-Type 2B Connections
-Type 2C Connections
-Type 2D Connections
-Type S Connections
-Common Channel Signaling (SS7)
-SS7 and Internet Protocol (IP) Signaling Systems
-Advanced Intelligent Networks (AIN)

Systems
-Plain Old Telephone Service (POTS)
-Integrated Digital Services Network (ISDN)
-Digital Subscriber Line (DSL)
-Digital Loop Carrier (DLC)
-Passive Optical Network (PON)

Services
-Voice
-Centrex
-Frame Relay Service
-Leased Lines
-Digital Subscriber Line (DSL)

Future Enhancements
-Packetized Voice
-High-Speed Multimedia Services
-Fiber Distribution Networks
-Softswitches
-References

Sample Diagrams

There are 16explanatory diagrams in this book

Telephone System Local Loop Operation

This diagram depicts a traditional local loop distribution system. This diagram shows a central office (CO) building that contains an EO switch. The EO switch is connected to the MDF splice box. The MDF connects the switch to bundles of cables in the "outside plant" distribution network. These bundles of cables periodically are connected to local distribution frames (LDFs). The LDFs allow connection of the final cable (called the "drop") that connects to the house or building. A NT block isolates the inside wiring from the telephone system. Twisted pair wiring is usually looped through the home or building to provide several telephone connection points, or jacks, so telephones can connect to the telephone system.


E.164 World Telephone Numbering Plan

This diagram shows the world (telephone) numbering plan recommendation, "E.164" developed by the International Telecommunications Union (ITU). This diagram shows the numbering plan divides a telephone number into a country code (CC), national destination code (NDC), and subscriber number (SN) for telephone numbering. The CC consists of one, two or three digits and the first digit identifies the world zone. This diagram shows that the local number can be divided into an exchange code (end office switch identifier) and a port (or extension) code.


Public Telephone System Interconnection Options

This figure illustrates some of the different types of private to public telephone system interconnection. This diagram shows some groups of phone lines (e.g., dial line, Type 1) that provide limited signaling information (line-side) that primarily interconnect the PSTN with private telephone systems. Another group of lines (Type 2 series) are used to interconnect switching systems or to connect to advanced services (such as operator services or public safety services). The interconnection lines (trunk-side) provide more signaling information. Also shown is the type S connection that is used exclusively for sending control signaling messages between switching system and the signaling system 7 (SS7) telephone control network.


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About the Authors

Mr. Harte has over 29 years of experience in the electronics industry including company leadership, product management, development, marketing, design, and testing of telecommunications (cellular), radar, and microwave systems. He has been issued patents relating to cellular technology. He has authored over 75 articles on related subjects and has been a speaker and panel moderator at industry trade events. Mr. Harte earned executive MBA at Wake Forest University and received his Bachelors degree from University of the State of New York. During the TDMA digital cellular standard development process, Mr. Harte served as an editor and voting company representative for the Telecommunications Industries Association (TIA) TR45.3, digital cellular standards committee. As of 2003, Mr. Harte had authored and co-authored over 20 books relating to telecommunications technology. He has served as a consultant and expert witness for leading companies including Ericsson, Siemens, VLSI, AMD, Casio, Samsung, Sony, ATT, Nokia, Hughes and many others.

Robert T. Floodhas had a distinguished 30-year career in the telecommunications industry. As a renowned speaker at forums around the globe, Robert is a noted authority on Internet Protocol (IP) telephony. Prior to co-founding PingTone Communications, a provider of managed IPT services to corporations and business users worldwide, Robert was the chief technology officer of Cable & Wireless Global, managing a $3 billion capital budget and 1,500 employees worldwide. Robert was previously the chief technology officer and senior vice president of engineering for ICG Communications, driving the Denver-based telecommunications company into 83 markets. At ICG Flood pioneered Voice over Internet Protocol (IP), covering 188 long distance markets within an 8-month period. Prior to that, he worked for CenTel for 19 years in senior engineering positions. Robert serves on the Board of Directors of several technology companies. He earned a bachelorís degree in Economics from the University of Nebraska, completed the executive program at the J.L. Kellogg Graduate School of Management at Northwestern University, and has a masterís degree in Economics from the University of Nevada Las Vegas.

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Description:

Public telephone networks are unrestricted dialing telephone networks that are available for public use to interconnect communications devices. This book describes the fundamentals of analog and digital telephone technology and communication and how the different types of analog and digital audio signals are described along with how their forms (PCM coding) differ in various parts of the world. You will learn about plain old telephone service (POTS) analog lines and integrated services digital network (ISDN) lines.

The efficient GR-303 digital loop carrier (DLC) system is described along with how remote digital terminal (RDT) can allow a single communication line to provide telephone service for many businesses and homes. You will also learn how passive optical networks (PONs) are being used to deliver high capacity fiber optic communication to the premises (FTTP) communication lines direct to customers locations.

The different types of switching systems are explained from circuit switched crossbar and time slot interchange (TSI) switches to packet voice and soft switches. You will learn how switches are interconnected with each other to form a global public telephone system.

Multi-channel trunked lines are described including digital signaling (DS) lines, synchronous optical lines, and multi-channel optical (WDM) lines. You will learn how customers may lease lines or portions of communication lines for their own specific purposes.

This book describes how telephone systems are controlled using signaling control messages, call processing, and SCP databases. You will learn about the different types of in-band tone signaling and of band common channel signaling system 7 (SS7). Also covered is how the public switched telephone network (PSTN) is beginning to use advanced intelligent network (AIN) to provide for advanced telephone service features.

Explained are the key types of telephone voice, data, video and Centrex services. You will learn how customer care systems are transitioning from labor-intensive customer service representatives (CSRs) to services that are setup by customer self provisioning.

Covered are the different types of digital subscriber line (DSL) including ADSL, ADSL2, HDSL, SDSL, and VDSL and how they connect the customer through digital subscriber line access modules (DSLAMs). You will learn that some DSL systems allow for the sharing of voice (analog) and digital (data) signals on the same line and how DSL data transmission capacity continues to increase to over 18 Mbps.

You will discover why and how telephone system operators are converting their networks from circuit switched networks to packet voice systems. Find out how packet voice systems can offer the same or better quality of service (QoS) as traditional legacy systems.

How telephone systems can offer television services with thousands of channels is explained along with the how the distribution of television signals through telephone lines can be performed efficiently. You will also learn why the skills of existing telephone system operators are well suited for this new field of television through telephone systems.

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