The Worldwide History of Telecommunications
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Laboratory #1: Transmission Line Characteristics
EEE 171 Lab #1 1 Laboratory #1: Transmission Line Characteristics I. OBJECTIVES Coaxial and twisted pair cables are analyzed. The results of the analyses are experimentally verified using a network analyzer. S11 and S21 are found in addition to the characteristic impedance of the transmission lines. II. INTRODUCTION Two commonly encountered transmission lines are the coaxial and twisted pair cables. Coaxial cables are found in broadcast, cable TV, instrumentation, high-speed computer network, and radar applications, among others. Twisted pair cables are commonly found in telephone, computer interconnect, and other low speed (<10 MHz) applications. There is some discussion on using twisted pair cable for higher bit rate computer networking applications (>10 MHz). The characteristic impedance of a coaxial cable is, L 1 m æ b ö Zo = = lnç ÷, (1) C 2p e è a ø so that e r æ b ö æ b ö Zo = 60ln ç ÷ =138logç ÷. (2) mr è a ø è a ø The dimensions a and b of the coaxial cable are shown in Figure 1. L is the line inductance of a coaxial cable is, m æ b ö L = ln ç ÷ [H/m] . (3) 2p è a ø The capacitor per unit length of a coaxial cable is, 2pe C = [F/m] . (4) b ln ( a) EEE 171 Lab #1 2 e r 2a 2b Figure 1. Coaxial Cable Dimensions The two commonly used coaxial cables are the RG-58/U and RG-59 cables. RG-59/U cables are used in cable TV applications. RG-59/U cables are commonly used as general purpose coaxial cables. -
Broadband Changes Everything
Broadband Changes Everything OECD Roundtable On Communications Convergence UK Department of Trade and Industry Conference Centre London June 2-3, 2005 Michael Hennessy President Canadian Cable Telecommunications Association CCTA Canadian Cable Telecommunications Association (CCTA) z Represents 78 cable companies CCTA’s primary role is to communicate the industry views to regulatory bodies, governments, and other stakeholders CCTA helps members to promote standards of excellence, assess new technology and business opportunities and advance the development of services to Canadian consumers CCTA recently changed its name to reflect shift from broadcasting to broadband 2 Industry Background Structure z 4 large companies z Over 80 smaller companies z $4.5 billion in revenues z Over 11.6 million homes passed z Over 7.5 million cable television customers z Over 1.6 million digital cable subscribers z Over 3.1million high-speed internet customers z Digital telephone launched 2005 3 1 Cable Industry Services Regulated under both Broadcasting & Telecommunications Acts Program distribution remains cable’s core service z Basic cable accounts for less than half of all cable revenues z Growth in distribution revenues driven by digital cable Broadband internet is cable’s fastest growing segment Cable telephony represents a new opportunity 4 More than TV Cable industry engaged in 5 year/$7.5 billion digital transformation Grown from simply video distributors to suppliers of advanced media and communications on demand IP is the most recent stage in a communications revolution that began 25 years ago Transformation accelerating from VoIP today to IPTV tomorrow 5 “Broadband by Cable” The Goal: z Accelerating the transition to fully digital broadband cable networks to be the preferred choice of consumers for all their entertainment, information and communications needs. -
EE 122: Networks & Protocols Welcome Our New TA
EE 122: Networks & Protocols Ion Stoica (and Brighten Godfrey) TAs: Lucian Popa, David Zats and Ganesh Ananthanarayanan http://inst.eecs.berkeley.edu/~ee122/ (Materials with thanks to Vern Paxson, Jennifer Rexford, and colleagues at UC Berkeley) 1 Welcome our New TA Ganesh Ananthanarayanan E-mail: [email protected] Office hours: WF 11-12; location: TBA Discussion section: TBA 2 1 Goals for Today’s Class Type of Networks And the key concept of multiplexing What’s a Protocol ? 3 What Global (non-digital) Communication Network Do You Use Every Day? Roughly speaking, how does it work? 4 2 What’s Another Such Network That You Use Every Day? 5 Taxonomy of Communication Networks Communication networks can be classified based on the way in which the nodes exchange information: Communication Network 6 3 Taxonomy of Communication Networks Communication networks can be classified based on the way in which the nodes exchange information: Communication Network Broadcast Communication Network 7 Broadcast Communication Networks Information transmitted by any node is received by every other node in the network Examples? Usually in LANs ( Local Area Networks) E.g., Ethernet (classical), WiFi E.g., lecture! What problems does this raise? Problem #1: limited range Problem #2: privacy of communication Problem #3: coordinating access to the shared communication medium ( Multiple Access Problem ) 8 4 Taxonomy of Communication Networks Communication networks can be classified based on the way in which the nodes exchange information: -
Offshore Wind Submarine Cabling Overview Fisheries Technical Working Group
OFFSHOREoverview WIND SUBMARINE CABLING Fisheries Technical Working Group Final Report | Report Number 21-14 | April 2021 NYSERDA’s Promise to New Yorkers: NYSERDA provides resources, expertise, and objective information so New Yorkers can make confident, informed energy decisions. Our Vision: New York is a global climate leader building a healthier future with thriving communities; homes and businesses powered by clean energy; and economic opportunities accessible to all New Yorkers. Our Mission: Advance clean energy innovation and investments to combat climate change, improving the health, resiliency, and prosperity of New Yorkers and delivering benefits equitably to all. Courtesy, Equinor, Dudgeon Offshore Wind Farm Offshore Wind Submarine Cabling Overview Fisheries Technical Working Group Final Report Prepared for: New York State Energy Research and Development Authority Albany, NY Morgan Brunbauer Offshore Wind Marine Fisheries Manager Prepared by: Tetra Tech, Inc. Boston, MA Brian Dresser Director of Fisheries Programs NYSERDA Report 21-14 NYSERDA Contract 111608A April 2021 Notice This report was prepared by Tetra Tech, Inc. in the course of performing work contracted for and sponsored by the New York State Energy Research and Development Authority (hereafter “NYSERDA”). The opinions expressed in this report do not necessarily reflect those of NYSERDA or the State of New York, and reference to any specific product, service, process, or method does not constitute an implied or expressed recommendation or endorsement of it. Further, NYSERDA, the State of New York, and the contractor make no warranties or representations, expressed or implied, as to the fitness for particular purpose or merchantability of any product, apparatus, or service, or the usefulness, completeness, or accuracy of any processes, methods, or other information contained, described, disclosed, or referred to in this report. -
Communications Under the Seas: the Evolving Cable Network and Its
Communications under the Seas The Evolving Cable Network and Its Implications edited by Bernard Finn and Daqing Yang The MIT Press Cambridge, Massachusetts London, England © 2009 Massachusetts Institute of Technology All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means (including photocopying, recording, or information storage and retrieval) without permission in writing from the publisher. For information about special quantity discounts, please email special_sales@mitpress .mit.edu This book was set in Bembo by The MIT Press. Printed and bound in the United States of America. Library of Congress Cataloging-in-Publication Data Communications under the seas : the evolving cable network and its implications / edited by Bernard Finn and Daqing Yang. p. cm. — (Dibner Institute studies in the history of science and technology) Includes bibliographical references and index. ISBN 978-0-262-01286-7 (hardcover : alk. paper) 1. Cables, Submarine—History. 2. Telecommunication—Social aspects—History. 3. Communication, International. I. Finn, Bernard S., 1932– II. Yang, Daqing, 1964– TK5103.15.C66 2009 621.387’8409162—dc22 2008042011 10 9 8 7 6 5 4 3 2 1 Index Admiralty (U.K.), 187 for voice communications, 37–38, 46, “Memorandum on the Protection of 51 British Submarine Cables,” 194 vacuum tube amplifiers, 30, 37, 46, 247 Ahvenainen, Jorma, 119 Anglo-American Telegraph Company, 29t, Alcatel, 175, 280 66, 71, 82–83, 162–163, 166 Alexander, grand duke of Russia, 124, 126 anti-trust legislation, 199 Algeria, 185 Associated Press, 169, 266 All America Cables, 33, 35, 84, 280 Atlantic Telegraph Company, 18, 66, 167 All-American Telegraph Companies, 89 AT&T. -
Study on International Internet Connectivity in Sub-Saharan Africa March 2013
REGULATORY AND MARKET ENVIRONMENT International Telecommunication Union Telecommunication Development Bureau Place des Nations STUDY ON INTERNATIONAL CH-1211 Geneva 20 Switzerland INTERNET CONNECTIVITY www.itu.int IN SUB-SAHARAN AFRICA MARCH 2013 Printed in Switzerland Telecommunication Development Sector Geneva, 2013 /2013 03 Study on international Internet connectivity in sub-Saharan Africa March 2013 This report has been prepared by Mr Abossé Akue-Kpakpo, under the direction of the Regulatory and Market Environment Division (RME) of the Telecommunication Development Bureau (BDT), in close coordination with ITU-T Study Group 3. The content of this report was presented during the seminars and meetings of the regional groups of the ITU Study Group 3 for Africa (SG3RG-AFR) in May 2012 and for Latin America and the Caribbean (LAC SG3RG) in March 2012. Please consider the environment before printing this report. © ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, in part or in full, without the prior written permission of ITU. Study on international Internet connectivity in sub-Saharan Africa Foreword It is my pleasure to introduce this report on International Internet Connectivity (IIC) in sub-Saharan Africa; this is part of a series of regional reports that address the present situation of Internet connection as well as future developments and challenges. These reports have been developed through collaboration between the ITU Telecommunication Development Bureau (BDT) the Telecommunication Standardization Bureau (TSB) in view of supporting policy makers, national regulatory authorities and operators in understanding the many aspects of international Internet connectivity. The digital revolution of the 21st century is being underpinned and in many cases driven by the growth, access and use of the Internet, but it has also led us to a modern indicator of division and poverty: exclusion from this revolution, from access to the Internet or telephone, and from the benefits of today's information society. -
Product Doc Guide
Engineered Interconnect Products Catalog and Custo:;; Desig:ls s:!:ce 1970 Super Flexible • Lov/ :"'oss• ?::ase Stable Ground-based • Shipboard • A;r • S90ce • Defense Wireless Communications • H:gh ?o'v'!er: • -:-es~ & Measurement FLEXible COaxial Cab."e ~_sse:::bjjes to 40 GHz Product Do~c Guide Flexeo Microwave, Inc. PO Box 115· 17 Karrville Road Port Murray, NJ 07865 Toll Free 800 84 FLEXC Telephone 908-835-1720 Fax 908-835-0002 www.FlexcoMW.com flexeD Microwave, Inc. PO Box 115 ° 17 Karrville Road Port Murray, NJ 07865 Telephone 908 850°5800 Fax 908 85005250 ~~~ Engineered Interconnect Products THE CTC EXPERIENCE Introducing a new member to our Test line, it will fulfill all your needs for a flexible, shielded, phase stable, durable Test Cable. The CTS is a version of the NTC with heavy armor. The electrical specs are the same but, what a difference. Superior torque and crush resistance, the design incorporates a stainless steel conduit covered with a stainless steel braid rendering it a virtually indestructible assembly. We actually drove a solid wheeled fork truck across it. This cable is ideal for Production testing or applications where there is excessive twisting and contorting imposed by the process or the operator. The trade off is the min. bend radius: NTC = 1.0 in. CTC = 1.5 in. If RFI/EMI is a concern, the effective shielding under dynamic conditions is in excess of -110 dBc. Flexco Microwave, Inc. PO Box 115, 17 Karrville Road Port Murray, NJ 07865 Telephone 800 84 FLEXC Fax 908-835-0002 E-mail [email protected] ~~~~1;~ Engineered Interconnect Products http://www.FlexcoMW.com Product Data Guide Table of Contents 4 NEW Super Low Loss Designs! Flexco'spatented outer conductor with an expanded PTFEdielectric FC105 to 26.5 8Hz 1A FCL02 to 188Hz 1B FC102 & FCL05 Call Factory VANA Cables for Precision test & measurement Rock Solid Phase & Amplitude. -
Registered Businesses Sorted by End Date Based on Registered Business Locations - San Francisco
Registered Businesses sorted by End Date Based on Registered Business Locations - San Francisco Business Account Location Id Ownership Name Number 0030032-46-001 0030032 Walgreen Co 0028703-02-001 0028703 Vericlaim Inc 1012834-11-141 0091116 Urban Land Services Of Cal 0348331-01-001 0348331 Tran Sandy Dung 0331802-01-001 0331802 Ken Chi Chuan Association 1121572-09-161 0113585 Arch Drafting Supply Inc 0161292-03-001 0161292 Fisher Marie F 0124761-06-001 0124761 Vaccaro Joseph & Maria 1243902-01-201 0306019 Shatara Suheil E 0170247-01-001 0170247 Henriquez Reinaldo 1125567-10-161 0130286 Chador Abraham & Co Inc 0189884-03-001 0189884 Mission Language & Vocl Sch 0318928-03-001 0318928 John W De Roy Chiroprac Corp 0030032-35-001 0030032 Walgreen Co 1228793-07-191 0148350 Willis John P 0310148-01-001 0310148 Blasko Peter B Et Al 0135472-01-001 0135472 Saddul Oscar Allado Md Inc 0369698-02-001 0369698 San Francisco Associates Inc 0189644-02-001 0189644 Neirro Erainya Rodgers G Etal Page 1 of 984 10/05/2021 Registered Businesses sorted by End Date Based on Registered Business Locations - San Francisco DBA Name Street Address City State Source Zipcode Walgreens #15567 845 Market St San Francisco CA 94103 Vericlaim Inc 500 Sansome St Ste 614 San Francisco CA 94111 Urban Land Services Of Cal 1170 Sacramento St 5d San Francisco CA 94108 Elizabeth Hair Studio 672 Geary St San Francisco CA 94102 Ken Chi Chuan Association 3626 Taraval St Apt 3 San Francisco CA 94116 Arch Drafting Supply Inc 10 Carolina St San Francisco CA 94103 Marie Fisher Interior -
2.5Gbps Internet Cable Modem with XFINITY® Voice
Data Sheet | CM2050V 2.5Gbps Internet Cable Modem with XFINITY® Voice 2 PHONE LINES Overview Experience a new generation of of today and tomorrow. DOCSIS® monthly cable modem rental fees†. cable modems that deliver up to 3.1 delivers the world’s fastest cable CM2050V includes two telephones 2.5Gbps Multi-Gigabit Internet Internet with speeds that are 10 ports that automatically prioritize speed, so you can be ready for the times faster than DOCSIS® 3.0. Save voice over internet for clear and fastest cable Internet service plans up to $168 per year by eliminating uninterrupted calls. PAGE 1 of 5 Data Sheet | CM2050V 2.5Gbps Internet Cable Modem with XFINITY® Voice Built for XFINITY® from Comcast Internet with Voice • Two (2) telephone ports that • Delivers up to 2.5Gbps ultra high speed • Built for Gigabit + 2.5Gbps cable automatically prioritize voice over Internet connections Internet service plans available today internet for the best call clarity and ready for future upgrades • DOCSIS® 3.1 is up to 10X faster than • Enhanced call features include the DOCSIS® 3.0 standard • Save up to $168 per year by eliminating 3-way conference calling, caller ID, monthly cable modem rental fee† call forwarding and more The NETGEAR Difference - CM2050V • 2.5Gbps ultra high speed Internet • Easy installation • Required for Gigabit XFINITY Internet connections with Voice plans • DOCSIS 3.1 Technology • Supports IPv6 Performance and Use • Ready for XFINITY's fastest Internet • Multi-gig Internet speed system— • Backward Compatible—Backward speeds with voice available by Cable Experience a new generation of cable compatible to 32x8 channel bonding in Service Providers—Built ready for modems that deliver up to 2.5Gbps DOCSIS® 3.0 mode Gigabit (and more) cable Internet Multi-Gigabit Internet. -
LP-C400 400 Series 50 Ohm Ultra Low Losses Coaxial Cable
Wireless - Coaxial LP-C400 400 Series 50 Ohm Ultra low losses LPC400_SS_ENB01I Characteristics Antenna Cable Runs to Base Stations, Access Points (AP), Bridges or CPE. Cabling between any WiFi or WiMax antenna and the associated equipment. Indoor or Outdoor Use. Direct Bury or Tower Use. Land Mobile Radio (LMR). Local Multi-Point Distribution LP-C400 400 Series 50 Ohm System (LMDS). Ultra low losses Coaxial Cable. Multi-Channel Multi-Point Distribution Service (MMDS). This is an ultra-low-loss 50 ohm coaxial cable ideal for RF deployment. This 400-Series cable offers equivalent or better characteristics and performance than other existing industry cables such as Commscope WBC-400*, Times Wireless Local Loop (WLL). Microwave LMR-400*, Andrew CNT-400*, etc. This cable size is the most demanded and widely used coaxial cable in the wireless industry. Personal Communication Systems (PCS). The LP-C400 is our superior Lower Loss-per-meter 400-Series coaxial cable GPS. offered. It is manufactured with a polyethylene (PE) jacket which is UV resistant, and is built to withstand harsh temperatures, grease, oil, chemicals, SCADA. salt water and abrasion, offering a 15 year plus lifespan. The LP-C400 with a tough PE jacket is especially suited for long life outdoor use. Ham Radio. If your application is direct burial, our LP-C400 is also the best choice with its polyethylene jacket (PE). Other jacket materials, such as polyvinyl chloride (PVC), TPE, etc. are not well suited for direct burial. While PE jackets do not offer the same flexibility as other materials, this is the only material that any experienced engineer will recommend for a direct burial application for long term survivability underground. -
Global Maritime Distress and Safety System (GMDSS) Handbook 2018 I CONTENTS
FOREWORD This handbook has been produced by the Australian Maritime Safety Authority (AMSA), and is intended for use on ships that are: • compulsorily equipped with GMDSS radiocommunication installations in accordance with the requirements of the International Convention for the Safety of Life at Sea Convention 1974 (SOLAS) and Commonwealth or State government marine legislation • voluntarily equipped with GMDSS radiocommunication installations. It is the recommended textbook for candidates wishing to qualify for the Australian GMDSS General Operator’s Certificate of Proficiency. This handbook replaces the tenth edition of the GMDSS Handbook published in September 2013, and has been amended to reflect: • changes to regulations adopted by the International Telecommunication Union (ITU) World Radiocommunications Conference (2015) • changes to Inmarsat services • an updated AMSA distress beacon registration form • changes to various ITU Recommendations • changes to the publications published by the ITU • developments in Man Overboard (MOB) devices • clarification of GMDSS radio log procedures • general editorial updating and improvements. Procedures outlined in the handbook are based on the ITU Radio Regulations, on radio procedures used by Australian Maritime Communications Stations and Satellite Earth Stations in the Inmarsat network. Careful observance of the procedures covered by this handbook is essential for the efficient exchange of communications in the marine radiocommunication service, particularly where safety of life at sea is concerned. Special attention should be given to those sections dealing with distress, urgency, and safety. Operators of radiocommunications equipment on vessels not equipped with GMDSS installations should refer to the Marine Radio Operators Handbook published by the Australian Maritime College, Launceston, Tasmania, Australia. No provision of this handbook or the ITU Radio Regulations prevents the use, by a ship in distress, of any means at its disposal to attract attention, make known its position and obtain help. -
The Socio-Economic Impact of Broadband in Sub-Saharan Africa: the Satellite Advantage
The Socio-Economic Impact of Broadband in sub-Saharan Africa: The Satellite Advantage The Socio-Economic Impact of Broadband in sub-Saharan Africa: The Satellite Advantage By the Commonwealth Telecommunications Organisation Page 1 The Socio-Economic Impact of Broadband in sub-Saharan Africa: The Satellite Advantage Executive Summary Broadband is not just a consequence of economic growth, it is also a cause. Sub-Saharan Africa has succeeded in the last decade in bringing voice services within the reach of some three quarters of the population, but the vast majority of the region is falling further behind the rest of the world in terms of broadband connectivity. There are two main reasons for this: supply is limited, and prices have been very high.1 Broadband is the delivery of Internet IP bandwidth (at speeds of 256 Kbps or more), and all of the content, services and applications which consume this bandwidth. The essential underpinning of broadband therefore is the need for a high capacity transmission backbone network capable of delivering this bandwidth. Providing an entry level 256 Kbps broadband service to hundreds, thousands or millions of customers requires a backbone transmission network with sufficient capacity to do so. And each time an operator increases its broadband service from 256 Kbps to 512 Kbps, 2 Mbps, or even 100 Mbps, this in turn escalates the capacity requirements of the transmission backbone network. The evolving broadband geography of sub-Saharan Africa reflects changes in the underlying level and pattern of supply of this trunk transmission capacity, and the pricing of that capacity. All of Africa’s international Internet bandwidth is supplied by satellite, submarine cables or terrestrial networks connected to submarine cables.