How telephones work pdf

Information about pairing antique telephones with modern phone service providers. The key is to make sure that the string is tight between the two cups, and this normally means that the distance is limited and the two people have to be connected to each other by a straight line. The finest antique telephones available old phone shop. A string telephone works very much like a landline phone. It has chips like analogtodigital and digitalto analog conversion chips that translate the outgoing audio signal from analog to digital and the incoming signal from digital back to analog. A telephone, also called phone is a communication tool.

Now it is an electronic tool sending digital signals on wires or radio transmission. A short explanation of how telephones, and the telephone network in general, work. Page 2 of 38 warning this circuit uses high voltage to operate the coin relay. For much of the 20th century, women played an important role in telecommunications system of the united states. Personal cell phone usage shall be limited to breaks and lunches. Plain old telephone service pots, or plain ordinary telephone service, is a retronym for voicegrade telephone service employing analog signal transmission over copper loops. To outline the use of personal cellular telephones cell phones at work, including special issues related to camera phones, use of personal cell phones in patient care areas and safe use of cell phones by employees while driving vehicles for work purposes. Federal communications commission 445 12th street sw, washington, dc 20554.

Together, they cited information from 10 references. When you made a telephone call, the number you dialled reached a specific place. In the earpiece of your telephone the part you listen from, there is a receiver. Personal calls during the work hours, regardless of the phone used, can interfere with employee productivity and be distracting to others. A cell phone offers full duplex communication and transfer the link when the user moves from one cell to another. The sound waves are carried to a thin metal disk inside the phone, called a diaphragm, and are converted into electrical energy. Students investigate how sound travels through string and air. Gain a broader knowledge of telephones with our associated lesson by the name of mechanics of the telephone. It is a software based system that operates independently of the voice transport itself the pstn. From the standpoint of business communication, telephone use has an enormous advantage.

Surprisingly, though, the basic technology that makes land line phones work hasnt changed drastically in the 100 years and more since then. This article was coauthored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. This is the basic way that telephones have worked since their invention by alexander graham bell in 1876. All phones are professionally restored to the utmost. When alexander graham bell developed the first telephone in the latter part of the 19th century, the industrial revolution suddenly changed as more and more people became interconnected to one another thus fueling business transactions. It is so simple because the telephone connection to your house has not changed in nearly a century. When the mobile phone move toward the edge of the cell, the cells base station will note that the signal strength is diminishing. Amplified cordless phone with digital answering machine 1 handset kxtgm450s. Long before cell phones became so cheap that anyone could afford one, cordless phones.

An electric current carries the sound to the telephone of the person he is talking to. Page 7 of 38 coin telephone types there are two types of older coin telephones, prepay and postpay. Distributed through a cluster of seven cells typical cell. Business technology includes any hardware or software used to complete workplace tasks. Finally, they are given a design challenge to redesign the string telephone for distance. Telephone and cell phone policy t elephones and p erson al c ell p ho n es while at work employees must exercise the same discretion in using personal cell phones as for the use of company phones. A central interconnection facility was needed, a place where telephone lines would be connected as desired. Linking rotary phones with cell phones and voip using bluetooth and wifi.

A landline phone connection is a current loop the original implementation is a carbon microphone to modulate the current and a speaker in series. Pots was the standard service offering from telephone companies from 1876 until 1988 in the united states when the integrated services digital network isdn basic. Official dod telephones are subject to monitoring for communication security purposes at all times. As the phone user moves from one cell area to another, the system automatically commands. Manage more than one call with these twoline telephones perfect for any busy office. Singleline telephones all the versatility and brilliant sound of a multiline system, available with singleline operation. May 08, 2017 a short explanation of how telephones, and the telephone network in general, work.

Home phones, or land lines as they are commonly known now, are very simple devices that, at their most basic, require only a switch, a speaker, and a microphone. Youth will ignite their curiosity and expand their critical thinking skills as they move from the planned and guided activity to an open exploration of different. At the same time, the base station in the cell in which the phone is moving will be able to see the phones. Originally it was an electric tool transmitting analogue speech along wires. First, they analyze the sound waves with a paper cup attached to a string. Generally, a telephone is any device which conveys sound over a distance.

Sewing machine automatic answering service mirrophone wire ribbon recorderplayer telephones picturephone bell chime. Do not discuss classified information on nonsecure telephones. Integrate other devices such as pdas, mp3 players and gps receivers a cell phone is a fullduplex device. Thomas edison made the telephone practical by inventing the carbon transmitter, used in all old telephones. Older dial and touchtone phones use a complicated box which separates out the ringer voltage ac. Then, they combine the string and cup with a partner to model a string telephone. Telephones used to be cumbersome and expensive pieces of equipment and, until mobile cellphones became popular from the 1980s, were invariably fixed in position. How cell phones work by julia layton and marshall brain and jeff tyson table of contents introduction to how cell phones work cell phone codes along comes digital millions of people in the united states and around the world use cellular phones.

The base receives the incoming call as an electrical signal through the phone line, converts it to an fm radio signal and then broadcasts that signal. Surprisingly, a telephone is one of the simplest devices you have in your house. As telephone operators, they helped customers make long distance. Cell phones work in a similar way but more technology is involved. The use of private lines was, of course, very restrictive. Projecting a professional image at work is important for career success. When you speak into a landline phone, your voice travels in small sound waves. If you want to talk to someone, all you have to do is pick up the phone and dial a few digits. Explanation of how cell phones work from how stuff works website. They are such great gadgets with a cell phone, you can talk to anyone on the planet.

How they work, information age, national museum of american history. Dr sadie plant except pp 4, 6, 8, 1112 drew jarrett. The reliable, fullfeatured panasonic kxtg958 series system is the smart 2line business, home and home office solution designed to make calling, messaging and conferencing easier and more convenient for everyone. Th s manual has all the feature operat ons and troubleshoot ng necessary to nstall and operate your new vtech telephone. The information is from 2000 but still interesting and has. The science of telephones making and exploring further make activities encourage problem solving through trial and error, allowing for individual creativity and experimentation. Western electric products telephones older models than. Powerpoint presentation on how cell phones work from stanford universitys slac laboratory website. We have automatic electric, western electric, stromberg carlson, kellogg and many other vintage phones. A cell is typically the area several miles around a tower in which a signal can be received.

Cordless telephones are one of those minor miracles of modern life with a cordless phone, you can talk on the phone while moving freely about your house or in your yard. Of these, 42 are used by the carrier for system control these frequencies are distributed via cells, each of which is typically from 1 to 10 square miles in area. A switchboard operator from the 1920s, working at a private branch exchange in a large corporate office. We offer a variety of old antique telephonesfor sale. Nec electra 616 824 1648 phones system downloadable manua. The needle was wired to a battery and the movement varied the strength of the current passing between the contacts, thus converting sound waves into an electric signal which travelled along a. Although most of us take it completely for granted, the telephone you have in your house is one of the most amazing devices ever created.

Forums calendar active threads forums threads posts last post. A landline telephone also known as land line, landline, main line, home phone, landline, fixedline, and wireline is a phone that uses a metal wire or optical fiber telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission. This website gives information on the work of the independent expert group on mobile phones iegmp. The circuit board is the heart of the mobile phone. Modern telephones scoop up their power from the phone line, batteries, or a plugin adapter. We sell candlestick telephones, model 102,202, 302 telephones and many other rotary phones. Ss7 works behind the scenes, so interacting with ss7 is. Telephones work and how radio works for details on these two technologies.

This is the basic way that telephones have worked since their. This is an early example of a magneto phone in buffalo gap. The base is attached to the phone jack through a standard phone wire connection, and as far as the phone system is concerned it looks just like a normal phone. The basics how cordless telephones work howstuffworks. A mobile phone is an electronic device used for mobile telecommunications over a cellular network of specialized base stations known as cell sites. The telegraph and telephone transformed american society and its economy. The soundpowered telephone is based on one of the first telephones invented. When a person speaks into a telephone, the sound waves created by his voice enter the mouthpiece. There are two main parts to a telephone that make it function.

In the mouthpiece of your telephone the part you talk into, there is the transmitter. With a prepay phone the most common you put the coin in first to get dial tone. Cellphone technology wireless phones which receive their signals from towers. People wanted to be able to talk with more than one other household. How telephones work howstuffworks electronics howstuffworks. The fundamentals behind cellular communication technology and how it operates. It is a misdemeanor for anyone to use the telephones as a means of conveying obscene or indecent language or to make anonymous or repeated calls to annoy, abuse, embarrass, or harass. Explanation of how telephones work from how stuff works website. The base receives the incoming call as an electrical signal through the phone line, converts it to an fm radio signal and then broadcasts that signal the handset receives the radio signal from the base, converts it to an electrical. Telephone operators engineering and technology history wiki. A string telephone, a megaphone, or a speaking tube might be considered telephonic instruments but for our purposes they are not telephones. Telephones are actually one of the simplest devices in your house. Receiving and placing excessive personal calls is disruptive to others and is prohibited.

Cell phones provide an incredible array of functions. When you talk into the cup your voice sends sound waves inside the cup, vibrating the bottom of the cup. The vibrations are transferred to the string, across the string and into the bottom of the other cup. The old two cans and a string technique or better yet, two paper cups and a string really does work. Personal cell phones shall disruptive to the business of egyptian electric not be cooperative. Select and use business technology all office environments use a variety of technology to carry out their work. We have sketchy documentation on the older phones that were produced by western electric prior to 1950.

When he shouted into the open end of the cone, his voice made the parchment vibrate, so the needle moved slightly in relation to a contact in the cup. The idea here is that people can work at home with the benefit of. Telephone history series by tom farley 215 19th street west sacramento, california 95691 usa. The basics each cell carrier is provided by fcc 832 frequencies per geographic area. Official panasonic home telephones cordless phones. If you want to talk to someone, all you have to do is pick up the phone. Telephone comes from the greek word tele, meaning from afar, and phone, meaning voice or voiced sound. Amplified cordless phone with digital answering machine 1 handset kxtgm420w. At its most basic a phone is nothing but a microphone and a speaker wired up to allow conversations to happen. If you have an antique phone from the 1920s, you could connect it to the wall jack in your house and it would work fine.

Please rev ew th s manual thoroughly to ensure proper nstallat on and operat on of th s. By looking at this lesson, you will have more of an understanding of. Answering the telephone is something that almost every employee does, regardless of his or her position in the company. In 2003, the cia world factbook reported approximately 1. A soundpowered telephone is exactly what the name suggestsa telephone system in which the power comes from the sound pressure of the talkers voiceno external power source is required. This work may be sued for your own noncommercial and per sonal use. Page 1 page 2 page 3 telephone button icons page 4 symbols used in this guide page 5 telephone features page 6 establish a threeparty conference call page 7 to split a conference page 8 dialing modes page 9 find mefollow me page 10 handsfreemute or handsfree button page 11 line redirection page 12 to. These transmit sound mechanically and not electrically. They think about their model as it compares a modern telephone and the impact the. Before us ng th s telephone, please read important safety instructions on page 33 of th s manual. Technical operations division cell phones 101 b6 objective identify the basic technology features which enable cell phone communication identify resources for more advanced study of cell phone technology.