The History of the Telephone
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
TELEPHONE TRAINING GUIDE] Fall 2010
[TELEPHONE TRAINING GUIDE] Fall 2010 Telephone Training Guide Multi Button and Single Line Telephones Office of Information Technology, - UC Irvine 1 | Page [TELEPHONE TRAINING GUIDE] Fall 2010 Personal Profile (optional) ........................................... 10 Group Pickup (optional) ............................................... 10 Table of Contents Abbreviated Dialing (optional) ..................................... 10 Multi-Button Telephone General Description Automatic Call-Back ..................................................... 10 ....................................................................................... 3 Call Waiting .................................................................. 10 Keys and Buttons ............................................................ 3 Campus Dialing Instructions ............................ 11 Standard Preset Function Buttons .................................. 3 Emergency 911 ............................................................. 11 Sending Tones (TONE) .................................................... 4 Multi-Button Telephone Operations ................ 4 Answering Calls ............................................................... 4 Placing Calls .................................................................... 4 Transferring Calls ............................................................ 4 Inquiry Calls .................................................................... 4 Exclusive Hold ................................................................. 4 -
Telecommunications Provider Locator
Telecommunications Provider Locator Industry Analysis & Technology Division Wireline Competition Bureau February 2003 This report is available for reference in the FCC’s Information Center at 445 12th Street, S.W., Courtyard Level. Copies may be purchased by calling Qualex International, Portals II, 445 12th Street SW, Room CY- B402, Washington, D.C. 20554, telephone 202-863-2893, facsimile 202-863-2898, or via e-mail [email protected]. This report can be downloaded and interactively searched on the FCC-State Link Internet site at www.fcc.gov/wcb/iatd/locator.html. Telecommunications Provider Locator This report lists the contact information and the types of services sold by 5,364 telecommunications providers. The last report was released November 27, 2001.1 All information in this report is drawn from providers’ April 1, 2002, filing of the Telecommunications Reporting Worksheet (FCC Form 499-A).2 This report can be used by customers to identify and locate telecommunications providers, by telecommunications providers to identify and locate others in the industry, and by equipment vendors to identify potential customers. Virtually all providers of telecommunications must file FCC Form 499-A each year.3 These forms are not filed with the FCC but rather with the Universal Service Administrative Company (USAC), which serves as the data collection agent. Information from filings received after November 22, 2002, and from filings that were incomplete has been excluded from the tables. Although many telecommunications providers offer an extensive menu of services, each filer is asked on Line 105 of FCC Form 499-A to select the single category that best describes its telecommunications business. -
The History of the Telephone
THE HISTORY OF THE TELEPHONE BY HERBERT N. CASSON First edition A. C. McClurg & Co. Chicago Published: 1910 PREFACE Thirty-five short years, and presto! the newborn art of telephony is fullgrown. Three million telephones are now scattered abroad in foreign countries, and seven millions are massed here, in the land of its birth. So entirely has the telephone outgrown the ridicule with which, as many people can well remember, it was first received, that it is now in most places taken for granted, as though it were a part of the natural phenomena of this planet. It has so marvelously extended the facilities of conversation--that "art in which a man has all mankind for competitors"--that it is now an indispensable help to whoever would live the convenient life. The disadvantage of being deaf and dumb to all absent persons, which was universal in pre-telephonic days, has now happily been overcome; and I hope that this story of how and by whom it was done will be a welcome addition to American libraries. It is such a story as the telephone itself might tell, if it could speak with a voice of its own. It is not technical. It is not statistical. It is not exhaustive. It is so brief, in fact, that a second volume could readily be made by describing the careers of telephone leaders whose names I find have been omitted unintentionally from this book--such indispensable men, for instance, as William R. Driver, who has signed more telephone cheques and larger ones than any other man; Geo. -
Two Paths to the Telephone
; --..- �-' f4�: . STRIKING PARALLELS between the telephones envisioned by electrode. In Bell's the variation would depend on the changes in the Elisha Gray and Alexander Graham Bell are evident in their respec area of the wedge-shaped needle tip immersed in the bath. The vary tive sketches of the instruments. Both Gray's transmitter(top) and ing current would then pass through an electromagnet(right) at the Bell's (bottom) depended on varying the resistance to the flow of cur receiving end of the circuit; variations in the magnetic field would rent from a battery. Both variations would be caused by the vertical cause a second diaphragm (in Gray's scheme) or a metal reed (in movement of a needle in a liquid bath; the motion would be due to Bell's) to vibrate, thereby reproducing the sound waves that actu the response of a diaphragm to the sound waves of the human voice. ated the transmitter. Gray made the sketch of his device on February In Gray's transmitter the variation in resistance would depend on 11, 1876, some two months after he conceived the idea. Bell made changes in the distance between the tip of the needle and the bottom his sketch on March 9, 24 days after filing his patent application. 156 © 1980 SCIENTIFIC AMERICAN, INC Two Paths to the Telephone As Alexander Graham Bell was developing the telephone Elisha Gray was doing the same. Bell got the patent, but the episode is nonetheless an instructive example of simultaneous invention by David A. Hounshell n one day in 1876-February 14-the one-third interest in the business, and also connected one lead of the second U.S. -
Dual Tone Multi Frequency (DTMF) Signal Generation and Detection Using MATLAB Software Nihat Pamuk Turkish Electricity Transmission Company, [email protected]
University of Business and Technology in Kosovo UBT Knowledge Center UBT International Conference 2015 UBT International Conference Nov 7th, 9:00 AM - 5:00 PM Dual Tone Multi Frequency (DTMF) signal generation and detection using MATLAB software Nihat Pamuk Turkish Electricity Transmission Company, [email protected] Ziynet Pamuk Sakarya University, [email protected] Follow this and additional works at: https://knowledgecenter.ubt-uni.net/conference Part of the Computer Sciences Commons, and the Digital Communications and Networking Commons Recommended Citation Pamuk, Nihat and Pamuk, Ziynet, "Dual Tone Multi Frequency (DTMF) signal generation and detection using MATLAB software" (2015). UBT International Conference. 97. https://knowledgecenter.ubt-uni.net/conference/2015/all-events/97 This Event is brought to you for free and open access by the Publication and Journals at UBT Knowledge Center. It has been accepted for inclusion in UBT International Conference by an authorized administrator of UBT Knowledge Center. For more information, please contact [email protected]. International Conference on Computer Science and Communication Engineering, Nov 2015 Dual Tone Multi Frequency (DTMF) signal generation and detection using MATLAB software Nihat Pamuk1, Ziynet Pamuk2 1Turkish Electricity Transmission Company 2Sakarya University, Electric - Electronic Engineering Department [email protected], [email protected] Abstract. In this study, Dual Tone Multi Frequency (DTMF) signal generation and detection is implemented by using Goertzel Algorithm in MATLAB software. The DTMF signals are generated by using Cool Edit Pro Version 2.0 program for DTMF tone detection. The DTMF signal generation and detection algorithm are based on International Telecommunication Union (ITU) recommendations. Frequency deviation, twist, energy and time duration tests are performed on the DTMF signals. -
The Telephone and Its Several Inventors
The History of Telecommunications The Telephone and its Several Inventors by Wim van Etten 1/36 Outline 1. Introduction 2. Bell and his invention 3. Bell Telephone Company (BTC) 4. Lawsuits 5. Developments in Europe and the Netherlands 6. Telephone sets 7. Telephone cables 8. Telephone switching 9. Liberalization 10. Conclusion 2/36 Reis • German physicist and school master • 1861: vibrating membrane touched needle; reproduction of sound by needle connected to electromagnet hitting wooden box • several great scientists witnessed his results • transmission of articulated speech could not be demonstrated in court • submitted publication to Annalen der Physik: refused • later on he was invited to publish; then he refused • ended his physical experiments as a poor, disappointed man Johann Philipp Reis 1834-1874 • invention not patented 3/36 The telephone patent 1876: February 14, Alexander Graham Bell applies patent “Improvement in Telegraphy”; patented March 7, 1876 Most valuable patent ever issued ! 4/36 Bell’s first experiments 5/36 Alexander Graham Bell • born in Scotland 1847 • father, grandfather and brother had all been associated with work on elocution and speech • his father developed a system of “Visible Speech” • was an expert in learning deaf-mute to “speak” • met Wheatstone and Helmholtz • when 2 brothers died of tuberculosis parents emigrated to Canada • 1873: professor of Vocal Physiology and Elocution at the Boston University School of Oratory: US citizen Alexander Graham Bell • 1875: started experimenting with “musical” telegraphy (1847-1922) • had a vision to transmit voice over telegraph wires 6/36 Bell (continued) • left Boston University to spent more time to experiments • 2 important deaf-mute pupils left: Georgie Sanders and Mabel Hubbard • used basement of Sanders’ house for experiments • Sanders and Hubbard gave financial support, provided he would abandon telephone experiments • Henry encouraged to go on with it • Thomas Watson became his assistant • March 10, 1876: “Mr. -
What to Do If You Hear Radio Communications on Your Telephone
What to do if you hear radio communications on your telephone Interference occurs when your telephone instrument fails to "block out" a nearby radio communication. Potential interference problems begin when the telephone is built at the factory. All telephones contain electronic components that are sensitive to radio frequencies, but cordless telephones are particularly susceptible because they use radio transmitters/receivers. Cordless telephones are also highly sensitive to electrical noise, (electric fences) radio interference, and the communications of other nearby cordless phones. Cordless phones with more features like messaging, redial and intercom, contain more electronic components; this creates a greater potential for outside interference. If the manufacturer does not build in interference protection, these components may react to nearby radio communications. For example, you could hear the transmission of a local radio station through your telephone’s handset. This is not necessarily a sign that the interference is intentional or that the interfering radio transmitter is illegal but that your equipment has no, or inadequate, protection. If you own an unprotected telephone, as the radio environment around you changes, you may sometimes hear unwanted radio communications. This is a technical problem, not a law enforcement problem Because interference problems begin at the factory, you should send your complaint to the manufacturer who built your telephone. It is important that you follow through and contact the manufacturer of your phone if you are having an interference problem. The company needs to know if you are unhappy about your phone’s failure to block out radio communications. Also, the manufacturer knows the designs of its telephones and may be able to suggest a solution for your specific phone. -
Telephone Equipment Distribution Program Can Help
DHS-4005-ENG 8-16 Do you have trouble using your telephone? The Telephone Equipment Distribution Program can help What is the Telephone Equipment How do I qualify? Distribution (TED) Program? You must provide proof that you: The TED Program provides telephone equip- Are a Minnesota resident ment to Minnesotans who have a hearing loss, Have a hearing loss, speech disability or speech disability or physical disability that physical disability that limits your use of a limits their use of a standard telephone. standard telephone What equipment is loaned? Have telephone service or have applied for telephone service Amplified telephones that clarify voices Have a family income less than or equal to Braille telephones for people who these guidelines: are deafblind family size annual gross income Captioned telephones 1 $49,081 Speaker phones 2 $64,183 Speech amplifying telephones 3 $79,285 4 $94,387 Telephone equipment for specific accommodations These guidelines are effective October 1, 2016 to September 30, 2017. Telephone ring signalers What if my income is too high to How much does this service cost? qualify? The equipment is provided on a long-term basis The TED Program can provide information as at no cost. to where to buy the telephone equipment. In Minnesota, a surcharge on all telephone lines funds the TED Program. ADA2 (12-12) This information is available in accessible formats for individuals with disabilities by calling 1-800-657-3663 or by using your preferred relay service. For other information on disability rights and protections, contact the agency’s ADA coordinator. How do I apply? Where are the regional offices? New applicants – Fill out and sign the application. -
POTS Modems Vs IP Telephony
Modems Vs IP Telephony Our Hotline, Vector, Matrix and BlueBox products all use V.34 modems designed for operation on conventional phone lines. Best modem performance occurs in the “classic” telephone setup of an analog line to the phone company, a digital conversion to a 64 kb/s path all the way to the other phone office, where the call goes back to analog for delivery to the other codec. The weak links have always been the analog loops at both ends, and any constriction in the digital path that results in a lower data rate. All of these things raise the noise seen by the modems, and may result in low connect speeds or intermittent behavior. There’s a new issue, however. If the network between the analog ends is done on IP circuits, the data throughput may drop, and will certainly be variable. IP traffic is sent with data packets that may be routed over widely different paths, or perhaps dropped altogether. The resulting delays, out-of-sequence data, and dead spots on Voice Over IP (VOIP) networks may be perfectly fine for voice calls, but are downright nasty for modem use. Even worse, data compression schemes such as V.729 that are used to shrink IP telephone channels down to 8 kb/s or less will absolutely keep a modem from operating. You’ll probably never even get a connection. Note that the IP conversion may be happening locally, or over the long-distance network. You are probably familiar with VOIP services offered by telephone and cable companies, as well as independent companies such as Vonage. -
Radiotelephone Transmitter. Tion of H3E and J3E Emissions on the (A) the Transmitter Must Be Capable Radiotelephone Distress Frequency
Federal Communications Commission § 80.859 § 80.855 Radiotelephone transmitter. tion of H3E and J3E emissions on the (a) The transmitter must be capable radiotelephone distress frequency. The of transmission of H3E and J3E emis- receiver must be capable of reception sion on 2182 kHz, and J3E emission on of J3E emissions on 2638 kHz and the 2638 kHz and at least two other fre- receiving frequencies associated with quencies within the band 1605 to 3500 the transmitting frequencies author- kHz available for ship-to-shore or ship- ized pursuant to § 80.855(a). to-ship communication. (b) One or more loudspeakers capable (b) The duty cycle of the transmitter of being used to maintain the distress must permit transmission of the inter- frequency (2182 kHz) watch at the prin- national radiotelephone alarm signal. cipal operating position and at any (c) The transmitter must be capable other place where the listening watch of transmitting clearly perceptible sig- is performed must be provided. nals from ship to ship during daytime (c) The receiver required by para- under normal conditions over a range graph (a) of the section must: of 150 nautical miles. (1) Have a sensitivity of 50 (d) The transmitter complies with microvolts; the range requirement specified in (2) Be capable of operation when en- paragraph (c) of this section if: ergized by the main source of energy, (1) The transmitter is capable of and by the reserve source of energy if a being matched to actual ship station reserve source is required by § 80.860(a); transmitting antenna meeting the re- (3) Be protected from excessive cur- quirements of § 80.863; and rents and voltages; (2) The output power is not less than (4) Be provided with a nameplate 60 watts peak envelope power for H3E showing the name of the receiver man- and J3E emission on the frequency 2182 ufacturer and the type or model. -
Bibliography on Videotelephony and Disability 1993-2002
Stockholm Institute of Education The Disability and Handicap Research Group Bibliography on Videotelephony and Disability 1993-2002 Magnus Magnusson & Jane Brodin Research Report 36 ISSN 1102-7967 Technology, Communication, Handicap ISRN 1102-HLS-SPEC-H-36-SE FOREWORD This report is part of the work at the FUNKHA-group at Stockholm Institute of Education, The Disability and Handicap Research Group It is also a complement to an earlier report published in 1993 within the European project RACE 2033 (Research in Advanced Communications Technologies in Europe), TeleCommunity. The earlier report was a compilation of references collected from nine databases on the subject of videotelephony. That report presented comments on 190 references from 20 years of publication, most of them related to disability. It is still available and the information is still valid. The present report wishes to follow up on that earlier study, almost exactly a decade later. We have made similar literature searches in similar databases. The main difference between the present and the earlier report is the fact that the field is more difficult to grasp today because there are more information sources, expecially the Internet itself which did not exist in any extensive form at that time. This means that the present report is more focussed on projects and activities and less on formal research reports and papers. The final result in numbers, however, was almost the same as in the first study in 1993, a total number of 188 formal references. We have tried to give a short and condensed picture of the situation as we see it in the world today in this very special, promising and dynamic field. -
Telephomania: the Contested Origins of the Urban Telephone Operating Company in the United States, 1879-1894
Telephomania: The Contested Origins of the Urban Telephone Operating Company in the United States, 1879-1894 Richard John Great Cities Institute College of Urban Planning and Public Affairs University of Illinois at Chicago Great Cities Institute Publication Number: GCP-05-02 A Great Cities Institute Working Paper JUNE 2005 The Great Cities Institute The Great Cities Institute is an interdisciplinary, applied urban research unit within the College of Urban Planning and Public Affairs at the University of Illinois at Chicago (UIC). Its mission is to create, disseminate, and apply interdisciplinary knowledge on urban areas. Faculty from UIC and elsewhere work collaboratively on urban issues through interdisciplinary research, outreach and education projects. About the Author Richard John is Associate Professor of History in the College of Liberal Arts and Sciences at the University of Illinois at Chicago. He may be contacted at [email protected]. Great Cities Institute Publication Number: GCP-05-02 The views expressed in this report represent those of the author(s) and not necessarily those of the Great Cities Institute or the University of Illinois at Chicago. This is a working paper that represents research in progress. Inclusion here does not preclude final preparation for publication elsewhere. Great Cities Institute (MC 107) College of Urban Planning and Public Affairs University of Illinois at Chicago 412 S. Peoria Street, Suite 400 Chicago IL 60607-7067 Phone: 312-996-8700 Fax: 312-996-8933 http://www.uic.edu/cuppa/gci UIC Great Cities Institute Telephomania: The Contested Origins of the Urban Telephone Operating Company in the United States, 1879-1894 This essay reconsiders the origins of the urban telephone exchange in the United States in the formative era of commercial telephony that stretched from 1879 and 1894.