BELL SYSTEM PRACTICES Engineering Series SECTION 790
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Chicago Telephone Company's Game
THE VOLUME NINE NUMBER NINE In This Issue- ''Machine Switching for the Bell System'' Subscrib~ r1 11 Dial By Bancroft Gherardi, Vice-President and Chief Engineer, and Harry P. Charlesworth, Equipment and Transmission Engineer, of the American Telephone and Telegraph Company. APRIL. 1920 SAVE COAL The X-Ray Reflector SAVE LABOR SAVE MATERIAL i.n the with Luminous Bowl POWERS The X-Ray silver-mirrored reflec tor used inside the X-Ray luminous bowl fixture gives true indirect HEAT REGULATION lighting. The diagram below illustrates the Your' employees, in office or shop, work better, with way this principle is worked out fewer mistake; and accident.>, when the room temperature the mirror reflector inside the· bowl and the porcelain cup at the bottom is automatically kept right. of the reflector which allows suffi A~:tomatic control in processes involving heat saves cient light through it to illuminate labor a.nd rr:aterial. the bowl itself. The result is a flood of mellow, Controlling heat at the point of use saves <:oal and evenly diffused light to the furthest labor, !besides improving output in quality -and quan corner of the room. tity. Write lor our new booklet on oHice Ask us to prove it to you at ur risk. lighting-Serial No. 134 THE POWERS REGULATOR CO. Specialists in Automatic Heat Control 973 Arehitecta Bldg., Ne w York 2162 M all.ers Bldg., Chicago 384 The Fo>deral St. Bldg., Booton The Canadian Powers Regulator National X-Ray Reflector Co. Co., Ltd. New York CHICAGO San Franciaco Toronto, Ont. (1211) W~~BASB 640 l'vill put you in toucn with per sonal and experienced insur "less cost per day of service" amce service for getting most reasonable rates and broadest ELEPHONE MEN the T world over know how the protection for your property, Columbia Gray Label proves household goods, automobile, the old adage that "talk is baggage and jewelry against cheap." Columbias are built to make the line talk up with a fire and theft. -
The Great Telecom Meltdown for a Listing of Recent Titles in the Artech House Telecommunications Library, Turn to the Back of This Book
The Great Telecom Meltdown For a listing of recent titles in the Artech House Telecommunications Library, turn to the back of this book. The Great Telecom Meltdown Fred R. Goldstein a r techhouse. com Library of Congress Cataloging-in-Publication Data A catalog record for this book is available from the U.S. Library of Congress. British Library Cataloguing in Publication Data Goldstein, Fred R. The great telecom meltdown.—(Artech House telecommunications Library) 1. Telecommunication—History 2. Telecommunciation—Technological innovations— History 3. Telecommunication—Finance—History I. Title 384’.09 ISBN 1-58053-939-4 Cover design by Leslie Genser © 2005 ARTECH HOUSE, INC. 685 Canton Street Norwood, MA 02062 All rights reserved. Printed and bound in the United States of America. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the publisher. All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Artech House cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark. International Standard Book Number: 1-58053-939-4 10987654321 Contents ix Hybrid Fiber-Coax (HFC) Gave Cable Providers an Advantage on “Triple Play” 122 RBOCs Took the Threat Seriously 123 Hybrid Fiber-Coax Is Developed 123 Cable Modems -
Bell System Practices Index
BELL SYSTEM PRACTICES SECTION 460-000-006 AT & TCo Standard Issue 6, February 1979 ALPHABETIC-NUMERIC INDEX STATION, KEY, PBX, AND PRIVATE SERVICE SYSTEMS 1. GENERAL Here is a list of the symbols and the service 1.01 This section provides an alpha-numeric index manual to which they refer. of sections required for the installation and maintenance of customer product equipment and SA-Station Service Manual I apparatus. SB-Station Service Manual II SC-Station Specialties Service Manual I 1.02 This section is reissued to update the SO-Station Specialties Service Manual II alpha-numeric index. CA-Coin Service Manual I CB-Coin Service Manual II 1.03 This index combines the features of both !A-Interconnect Service Manual I alphabetic and numeric indexes. Sections IB-Interconnect Service Manual II can be located by referring first to the common KA-Key Service Manual I nomenclature or ordering nomenclature, then referring KB-Key Service Manual II to a major indention for the type of information KC-Key Service Manual III such as Identification, Installation, Maintenance, PA-Dial PBX Service Manual Reference, Service, etc., and then to the alphabetical or numerical listing. 1.04 Many of the section numbers in this index are preceded by a two letter symbol such as SA. This symbol indicates that the section is contained in a service manual in addition to the standard BSP files. NOTICE Not for use or disclosure outside the Bell System except under written agreement Printed in U.S.A. Page 1 SECTION 460-000-006 AC-TYPE (USED WITH 220-, 226-, 2220-, ADDRESSABLE -
Switching Relations: the Rise and Fall of the Norwegian Telecom Industry
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by NORA - Norwegian Open Research Archives Switching Relations The rise and fall of the Norwegian telecom industry by Sverre A. Christensen A dissertation submitted to BI Norwegian School of Management for the Degree of Dr.Oecon Series of Dissertations 2/2006 BI Norwegian School of Management Department of Innovation and Economic Organization Sverre A. Christensen: Switching Relations: The rise and fall of the Norwegian telecom industry © Sverre A. Christensen 2006 Series of Dissertations 2/2006 ISBN: 82 7042 746 2 ISSN: 1502-2099 BI Norwegian School of Management N-0442 Oslo Phone: +47 4641 0000 www.bi.no Printing: Nordberg The dissertation may be ordered from our website www.bi.no (Research - Research Publications) ii Acknowledgements I would like to thank my supervisor Knut Sogner, who has played a crucial role throughout the entire process. Thanks for having confidence and patience with me. A special thanks also to Mats Fridlund, who has been so gracious as to let me use one of his titles for this dissertation, Switching relations. My thanks go also to the staff at the Centre of Business History at the Norwegian School of Management, most particularly Gunhild Ecklund and Dag Ove Skjold who have been of great support during turbulent years. Also in need of mentioning are Harald Rinde, Harald Espeli and Lars Thue for inspiring discussion and com- ments on earlier drafts. The rest at the centre: no one mentioned, no one forgotten. My thanks also go to the Department of Innovation and Economic Organization at the Norwegian School of Management, and Per Ingvar Olsen. -
Design of a Circuit for Remote Control of Multiple Devices Using DTMF Encoder and Decoder
International Journal of Scientific and Research Publications, Volume 3, Issue 12, December 2013 1 ISSN 2250-3153 Design of a Circuit for Remote Control of Multiple Devices using DTMF Encoder and Decoder Haimanti Chakraborty*, Prof. (Dr.) Prabir Banerjee* * Department of Electronics & Communication Engineering, Heritage Institute of Technology, Kolkata, India frequencies that will be transmitted via an analog communication Abstract- With the advancement in technology, the number channel or network like a telephone line. It was developed of electronic devices in our day-to-day lives has increased to by Western Electric and introduced by AT&T in 1963. During its make life simpler. So a necessity to construct a Universal development, unique individual frequency filters were chosen Remote System that will easily control all these devices from a carefully so that the tones could easily travel via the telephone distance will not only reduce the complexity of handling the lines (the maximum guaranteed bandwidth for a standard number of devices simultaneously, but also save power. telephone line extends from around 300 Hz to 3.5 kHz). DTMF This paper presents a successfully developed hardware was not intended for data transfer, rather for control signals only. of a Universal Remote Control System using DTMF (Dual- With a standard DTMF encoder/decoder, it is possible to signal Tone Multi-Frequency) tones as the control signals. The at a rate of around 10 tones/signals per second. uniqueness of DTMF is that it is simple to generate and noise- The DTMF keypad is laid out in a 4x4 matrix, with two immune. This system was also implemented using GSM links frequencies (each row representing a low frequency and each besides the wired channel, the main advantage of it being that it column representing a high frequency) played simultaneously by helps in controlling devices located at any part of the world or a standard home phone/fax or mobile phone. -
Issued: October 1, 2007 Effective: October 11, 2007 BY
WIRELESS CARRIER INTERCONNECTION SERVICE TARIFF 8th Revised Sheet 1 Replacing 7th Revised Sheet 1 INDEX WIRELESS CARRIER INTERCONNECTION SERVICE Sheet GENERAL 1 DEFINITIONS 1 GENERAL REGULATIONS 3 (CT) Liability of the Company 3 Obligations of the Carrier 4 Payments, Deposits and Termination of Service 5 Directory Listings 7 Directory Assistance 7 Directory Assistance Call Completion 7 Operator Service 8 Special Construction 8 Radio Transmitter Links 8 Special Service Arrangements 8 Telephone Numbers 8 Wireless Carrier Provided Facilities 9 Telecommunications Service Priority System 9A Additional Engineering and Labor 9A Assignment and Transfer of Facilities 9A DESCRIPTION OF SERVICE 10 FEATURES 13 Optional Features - Nonchargeable 13 Optional Features - Chargeable 14 RATE REGULATIONS 14 Originating Connecting Circuits - Type 1 and Type 2A 14A Terminating Connecting Circuits - Type 1 and Type 2A 15 Area Wide Calling Plan Connecting Circuits 16B Nonrecurring Charges - Type 1 and Type 2A 17 Minimum Monthly Charges - Type 1 and Type 2A 17 Type 2B Service 17 Common Channel Signaling/Signaling System Seven (CCS/SS7) 18A RATES AND CHARGES 19 Vacant 19 Area Wide Calling Plan Usage Rate Elements 19A Directory Assistance Services 19A Directory Assistance Call Completion 19A Telephone Number Groups and Dedicated NXX Charges 21 Nonrecurring Charges 22 WIRELESS 911 CONNECTION CIRCUIT SERVICE 24 Issued: October 1, 2007 Effective: October 11, 2007 BY: MICHAEL R. SCOTT, President-Kansas Southwestern Bell Telephone Company Topeka, Kansas WIRELESS CARRIER INTERCONNECTION SERVICE TARIFF Original Sheet 2 TRADEMARKS AND SERVICE MARKS (AT) Telcordia® and Common Language® are registered trademarks and iconectiv, CLCI, CLEI, CLFI, CLLI, USOC, FID, NC, NCI and NC/NCI, are trademarks of Telcordia Technologies, Inc. -
The American Telephone and Telegraph Company Divestiture: Background, Provisions, and Restructuring
Report No. 84-58 E I -. <I?....*- ".YII. -n, -- THE AMERICAN TELEPHONE AND TELEGRAPH COMPANY DIVESTITURE: BACKGROUND, PROVISIONS, AND RESTRUCTURING b Y Angele A. Gilroy Specialist in Industrial Organization Economics Division COLLECTION WKI HEKN !CNTUCKY LIBRARY April 11, 1984 11 i :::A L.'~~-l.ii.e makes jucn research available. without parti- ::;I.. in lr:m\ !orrns inc!uding studies. reports. cornpila- ;,)I!., I!:<?\[>. :md l:a~kqroi~ndhrietings. Cpon request. CRS .. ., :i ~ !>!r::z:rrir.e.;in ann1~-zingle+slative proposals and -tl:..b. :!nd in s>w;sinq the possible effects of these proposals . < :!I irie.The Ser~ice'ssenior specialists and ii,:c( r :iil.,;ii ?is are also at-aiiable for personal consultations ;xi-ir :.t>.;!?ecri\-elieid.; t~f'expertise. ABSTRACT On January 1, 1984, The American Telephone and Telegraph Company (AT&T) di- vested itself of a major portion of its organizational structure and functions. Under the post-divestiture environment the once fully-integrated Bell System is now reorganized into the "new" AT&T and seven Ladependent regional 5olding ?om- panies -- American Information Technologies Corp., 3ell Atlantic Corp., 3ell- South Corp., NYNEX Corp., Pacific Telesis Group., Southwestern Bell Corp., and U.S. West, Inc. The following analysis provides an overview of the pre- and post-divestiture organizational structure and details the evolution of the anti- trust action which resulted in this divestiture. CONTENTS ABSTRACT ................................................................ iii INTRODUCTION ............................................................ 1 1 . BELL SYSTEM CORPORATE REORGANIZATION .............................. 3 A . Predivestiture Bell System Corporate Structure ................ 3 B . Divested Operating Company Structure .......................... 5 C . Post-Divestiture AThT Organizational Structure ................ 7 11. -
MAS.632 Conversational Computer Systems
MIT OpenCourseWare http://ocw.mit.edu MAS.632 Conversational Computer Systems Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms. 10 Basics of Telephones This and the following chapters explain the technology and computer applica tions oftelephones, much as earlier pairs ofchapters explored speech coding, syn thesis, and recognition. The juxtaposition of telephony with voice processing in a single volume is unusual; what is their relationship? First, the telephone is an ideal means to access interactive voice response services such as those described in Chapter 6. Second, computer-based voice mail will give a strong boost to other uses of stored voice such as those already described in Chapter 4 and to be explored again in Chapter 12. Finally, focusing on communication,i.e., the task rather than the technology, leads to a better appreciation of the broad intersec tion of speech, computers, and our everyday work lives. This chapter describes the basic telephone operations that transport voice across a network to a remote location. Telephony is changing rapidly in ways that radically modify how we think about and use telephones now and in the future. Conventional telephones are already ubiquitous for the business traveler in industrialized countries, but the rise in personal, portable, wireless telephones is spawning entirely new ways of thinking about universal voice connectivity. The pervasiveness of telephone and computer technologies combined with the critical need to communicate in our professional lives suggest that it would be foolish to ignore the role of the telephone as a speech processing peripheral just like a speaker or microphone. -
WE Inter-Phones and Accessories 1915
• ,..--·~! l ? -/ t F .L_:"""; ..... ~ 1915 , . / -, iEl1@~;t!?ll~ ," cMQ)JNIE~ TCI Library: www.telephonecollectors.info Page 1 }H1sll'rn #.£/,rlrit COMPANY Inter-phones and Accessories "INTER-PHONE" is the trade name adopted by the Western Electric Company for what is commonly known as Intercommunicating Telephone Apparatus. On the following pages will be found much information of value. "e have avoided, as far as possible, the use of general or descriptive information, and have endeavored to condense all data given. Wiring diagrams are also shown. Three general types of Inter-phones-\\all, desk, and hand-set types-are furnished. Under each system are listed the types adapted for the service described. INTER-PHONE SYSTEMS The various systems for which Inter-phones are adapted are as follows: HOUSE TELEPHONE SYSTEM. Multi-station, one or two-way service. Two to three line wires. System No. 16, list on page 3. ___ TWO STATIONS ONLY. Two line wires. Batteries at each station. System No. 14, listed on page 6. TWO TO SIX STATIONS. Code ri"gings-common talking. Three to foUl' line wires. Batteries at one station only. ,-,ystem No. 15, listed on page 7. THREE TO NINE STATIONS. Selective ringing. Common talking. Batteries at one s a ion only. System TO. 11, lis on page 11. MASTER STATION and not more than twelve outlying stations. Batteries at mas er s ation only. System Ko. 12 lis~ed on page 13. NOT MORE THAN TWENTY-FOUR STATIONS. Selective ringing and talking be tween all stations. System :;\0. 1, listed on page 18. A SYSTEM ALLOWING SECRET CONVERSATIONS between certain stations, being a modification of System No. -
Protected Landmark Designation Report
CITY OF HOUSTON Archaeological & Historical Commission Planning and Development Department PROTECTED LANDMARK DESIGNATION REPORT LANDMARK NAME: Western Electric Company Building AGENDA ITEM: III.b OWNER: Caspian Enterprises Inc. HPO FILE NO: 12PL112 APPLICANT: Same as Owner DATE ACCEPTED: Sep-5-2012 LOCATION: 100 Jackson Street HAHC HEARING: Sep-20-2012 SITE INFORMATION Lots 3, 4, and 5, Block 106, Baker SSBB, City of Houston, Harris County, Texas. The site includes a three-story brick warehouse building with one-story side addition. TYPE OF APPROVAL REQUESTED: Protected Landmark Designation for an existing Landmark HISTORY AND SIGNIFICANCE SUMMARY In 2009, City Council designated the Western Electric Company Building at 100 Jackson Street as a City of Houston Landmark. The property owner is now requesting Protected Landmark designation for the building. The Western Electric Company Building at the corner of Jackson Street and Commerce Avenue is a three-story brick warehouse building built circa 1917. The building is located in Houston’s Warehouse District on the east side of downtown south of Buffalo Bayou. The Warehouse District largely developed from 1890 through the 1930s to accommodate Houston’s rapid economic expansion in those decades. With its proximity to rail and shipping, the area attracted numerous commercial and industrial businesses until the decline of the railroads and the ascension of trucking after World War II allowed industrial development to disperse throughout the city. The building’s namesake and original tenant, Western Electric, got its start in Chicago in the 1870s as a manufacturer of telegraph equipment for Western Union, and by 1882, had been acquired by Bell Telephone (later AT&T) as its manufacturing arm. -
NANPA Annual Report 2018
North American Numbering Plan Administrator Annual Report 2018 1 NORTH AMERICAN NUMBERING PLAN Background In October of 2018, following a competitive bidding process, the Federal Communications Commission (FCC) awarded Somos, Inc. (Somos), the contract to perform the North American Numbering Plan Administrator (NANPA) services, effective January 1, 2019. Pursuant to this award, the system and personnel transitioned from the incumbent to Somos. The NANPA is required to publish, within the first quarter of the year, an annual report covering the performance of the prior year. Somos did not serve as the NANPA during 2018; however, the same personnel who performed the NANPA services in 2018 are now employees of Somos. Somos therefore submits the following 2018 Annual Report in the interest of providing informational continuity to the FCC and the industry. By doing so, Somos does not intend to speak for or represent the interests of the former incumbent. History The North American Numbering Plan (NANP) was developed by AT&T in 1947 to simplify and facilitate direct dialing of long-distance calls. NANP telephone numbers are ten-digit numbers consisting of a three-digit Numbering Plan Area (NPA) code, commonly called an area code, followed by a seven-digit local number. The NANP is an integrated numbering plan serving twenty North American countries that share its resources. Regulatory authorities in each participating country have plenary authority over numbering resources, but all participating countries, implicitly or explicitly, share numbering resources cooperatively. This approach has been successful for seventy years. North American Numbering Plan Administration AT&T administered shared numbering resources such as area codes until divestiture of the Bell System in 1984, when these functions were transferred to Bellcore under the Plan of Reorganization. -
U.S. Telco Industry History As a Prologue to Its Future
Australian Journal of Telecommunications and the Digital Economy U.S. Telco Industry History as a Prologue to its Future Carol C. McDonough University of Massachusetts Lowell Abstract: The United States telco industry has been shaped by the interplay of technological advance, free enterprise, politics, public pressure, and government regulation. The history of the industry reveals a continuing tension between the forces of competition and concentration. Having coursed through eras of monopoly, competition, and regulated monopoly, the telcos are now in a more competitive arena. There is regulatory uncertainty on the issue of net neutrality. Keywords: Net neutrality, technology, competition, monopoly, regulation Introduction The U.S. telco industry has been shaped by the interplay of technology, free enterprise, politics, public pressure, and government regulation. The history of the industry reveals a continuing tension between the forces of competition and concentration. High fixed costs and low and often declining marginal and average costs drive the industry toward higher levels of concentration. However, because a competitive market tends to benefit consumers and better allocate resources, the government has at times tried to promote a more competitive industry structure. Existing technology affects the relative validity of these two opposing forces. However, whether we examine the industry in its early stages, or today as it faces the issue of net neutrality, the basic tension between competition and concentration remains a pivotal challenge. Having coursed through eras of monopoly, competition, and regulated monopoly, the telcos in the United States are now in a more competitive arena. As the telcos broaden their menu of services to include not only voice telephony but also television, Internet and wireless communication services, the telcos have competition from cable companies and wireless services.