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The telephone (from the , tēle, "far" and φωνή, phōnē, "voice") is a telecommunications device that is used to transmit and receive electronically or digitally encoded sound (most commonly speech) between two or more people conversing. It is one of the most common household appliances in the developed world today. Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost any other user. Graphic symbols used to designate telephone service or phone-related information in print, signs, and other media include , , , and .

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Blogs for Telephone

Phone Blog

The Radioactive Yak (My Blog) My Personal Blog. Google Office Tools. Intervention Engineering ... it Looks Like. Welcome to my Phone's Blog ©2007 Reto Meier ...phoneblog.radioactiveyak.com/

Mobile Phone Blog - iPhone, SmartPhone, CellPhone Information

Opinions on cell phone content, downloadable mobile games, new firms in the market, and the health of the global wireless industry. ... Mobile Phone Blog Home Page ...www.mobilephoneblog.org/

Cell Phone News Blog

Planet Cell Phone is a Blog dedicated to mobile phones. Your Editors ... Planet Cell Phone Blog is proudly powered by WordPress Entries (RSS) and Comments (RSS) ...blog.planet-cell-phone.com/

Blog - WirelessInfo.com - Cell Phone Reviews and Wireless Plan Ratings

POPULAR PHONE REVIEWS ... The wirelessinfo.com blog covering the latest leaks, rumors and developments in ... Skype-to-Skype Internet phone calls, and more. ...www.wirelessinfo.com/d/Blog.htm

PhoneTalk Home

Comments | More In The Know Posts| Email This Blog. Phone Smarts ... Exclusive live Draft Day blog by NFL expert Adam Schefter through Rounds 1 and 2. ...www.letstalk.com/blog/home.htm

Wikipedia About Telephone

The telephone (from the , tēle, "far" and φωνή, phōnē, "voice") is a telecommunications device that is used to transmit and receive electronically or digitally encoded sound (most commonly speech) between two or more people conversing. It is one of the most common household appliances in the developed world today. Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost any other user. Graphic symbols used to designate telephone service or phone-related information in print, signs, and other media include , , , and .

Basic principle

1896%20telephone.jpg

The telephone consists of an alerting device, usually a ringer, that remains connected to the phone line whenever the phone is "on hook", and other components which are connected when the phone is "off hook". These include a transmitter (microphone), a receiver (speaker) and other circuits for dialing, filtering, and amplification. A calling party wishing to speak to another party will pick up the telephone's handset, thus operating a button switch or "switchhook", which puts the telephone into an active (off hook) state by connecting the transmitter (microphone), receiver (speaker) and related audio components to the line. This circuitry has a low resistance (less than 300 Ohms) which causes DC current (48 volts, nominal) from the telephone exchange to flow through the line. The exchange detects this DC current, attaches a digit receiver circuit to the line, and sends a dial tone to indicate readiness. On a modern telephone, the calling party then presses the number buttons in a sequence corresponding to the telephone number of the called party. The buttons are connected to a tone generator circuit that produces DTMF tones which end up at a circuit at the exchange. A rotary dial telephone employs pulse dialing, sending electrical pulses corresponding to the telephone number to the exchange. (Most exchanges are still equipped to handle pulse dialing.) Provided the called party's line is not already active or "busy", the exchange sends an intermittent ringing signal (generally over 100 volts AC) to alert the called party to an incoming call. If the called party's line is active, the exchange sends a busy signal to the calling party. However, if the called party's line is active but has call waiting installed, the exchange sends an intermittent audible tone to the called party to indicate an incoming call.

The phone's ringer is connected to the line through a capacitor, a device which blocks the flow of DC current but permits AC current. This constitutes a mechanism whereby the phone draws no current when it is on hook, but exchange circuitry can send an AC voltage down the line to activate the ringer for an incoming call. When a landline phone is inactive or "on hook", the circuitry at the telephone exchange detects the absence of DC current flow and therefore "knows" that the phone is on hook with only the alerting device electrically connected to the line. When a party initiates a call to this line, and the ringing signal is transmitted. When the called party picks up the handset, they actuate a double-circuit switchhook which simultaneously disconnects the alerting device and connects the audio circuitry to the line. This, in turn, draws DC current through the line, confirming that the called phone is now active. The exchange circuitry turns off the ring signal, and both phones are now active and connected through the exchange. The parties may now converse as long as both phones remain off hook. When a party "hangs up", placing the handset back on the cradle or hook, DC current ceases to flow in that line, signaling the exchange to disconnect the call.

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News about Telephone

Cyberclinic: Why is it impossible to contact Google by telephone?

Independent The competition for worst customer support is a fiercely contested one, particularly in the field of technology. Of course, the complexity of gadgets, gizmos and software guarantees that there's going to be more demand for post-purchase hand-holding than if you'd bought a pair of ill-fitting trousers. But while we've all had tense phone conversations with support staff while staring ...http://www.independent.co.uk/life-style/gadgets-and-tech/fea...

ZTE, China Communications Fall by Records on New Network Rules

BloombergOct. 8 (Bloomberg) -- ZTE Corp. and China Communications Services Corp. both fell by records in Hong Kong trading on concern their sales will be hurt by a government order for domestic carriers to restrict spending on new telephone networks.http://www.bloomberg.com/apps/news?pid=20601204&sid=axpTi8C1...

Burress relatively unapologetic in return to Giants

USA TodayAn unapologetic Plaxico Burress rejoined the New York Giants on Monday, noting he didn't lose any sleep after the Super Bowl champions suspended him for a game. Burress missed a team meeting two weeks ago without bothering to telephone the Giants.http://www.usatoday.com/sports/football/nfl/giants/2008-10-0...

Internet orders lift Thorntons sales

ShareCast via Yahoo! UK & Ireland FinanceNew store openings and increased telephone and internet orders helped chocolate retailer Thorntons post a 4.7% rise in sales in the 14 weeks to October 4.http://uk.biz.yahoo.com/081008/214/i88sj.html

FSA imposes GBP7 million fine on Alliance & Leicester for PPI failings

Insurance Business ReviewThe UK Financial Services Authority has fined Alliance & Leicester GBP7 million for failings in its telephone sales of payment protection insurance.http://www.insurance-business-review.com/article_news.asp?gu...

News about Telephone

CORRECTED - UPDATE 1-NovaGold to pay nearly $900,000 fine for ...

ReutersWe're likely looking at trying to position ourselves for start-up in spring or summer of 2010," NovaGold's vice president for strategic development, Greg Johnson, told Reuters in a telephone interview. Reopening the mine would require an investment ... http://www.reuters.com/article/governmentFilingsNews/idUSN12...

Rare blue diamond fetches over $8.4M at auction

Boston GlobeA Sotheby's employee displays a rare vivid blue diamond ring weighing 7.03 carats, during a preview at Sotheby's in ... The anonymous telephone bidder has yet to name the diamond, Bennett said.http://www.boston.com/news/world/europe/articles/2009/05/12/...

Law Offices of Howard G. Smith Announces Class Action Lawsuit Against ...

MSN MoneyCentralSmith, 3070 Bristol Pike, Suite 112, Bensalem, Pennsylvania 19020, by telephone at (215) 638-4847, Toll-Free at (888) 638-4847, by email to howardsmith@howardsmithlaw.com or visit our website at www.howardsmithlaw.com . Law Offices of ... http://news.moneycentral.msn.com/provider/providerarticle.as...

Hugo Chavez launches mobile phone with rude name

Daily TelegraphThis telephone will be the biggest seller not only in Venezuela but the world. Whoever doesn't have a Vergatario is nothing." He even telephoned his mother during the launch ceremony. But critics have described the choice of name given to the phone as ... http://www.telegraph.co.uk/news/worldnews/southamerica/venez...

Accused soldier's father says son 'broke'

San Francisco GateThere was no response Tuesday to a telephone call and a visit to Russell's ex-wife. In 1993, a month after the divorce decree was issued, Russell was charged with misdemeanor assault but the matter was dropped, records show. Jack McGowen, listed as ... http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2009/05/12/...

Search results for Telephone

Telephone - LoveToKnow 1911

TELEPHONE (Gr. TilXe, far, and qk vrl, voice). Telephony is the art of reproducing sounds at a distance from their source, and a telephone is the instrument employed in sending or ... http://www.1911encyclopedia.org/Telephone

telephone definition of telephone in the Free Online Encyclopedia.

telephone, device for communicating sound, especially speech, usually by means of wires in an electric circuit. The telephones now in general use evolved from the device invented ... http://encyclopedia2.thefreedictionary.com/telephone

telephone - Definition of telephone at YourDictionary.com

noun ☆ a system for transmitting speech or computerized information over distances, usually by converting sounds into electric impulses that are sent through a network of wires ... http://www.yourdictionary.com/telephone

Telephone (US) on MySpace Music - Free Streaming MP3s, Pictures ...

MySpace Music profile for Telephone (US). Download Telephone (US) New Wave / Rock / music singles, watch music videos, listen to free streaming mp3s, & read Telephone (US)'s blog.http://www.myspace.com/telephone

Telephone History - Invention of the Telephone

Fascinating facts about the invention of the Telephone by Alexander Graham Bell in 1876..http://www.ideafinder.com/history/inventions/telephone.htm

Wikipedia results for Telephone

Telephone - Wikipedia, the free encyclopedia

The telephone (from the Greek: τῆλε, tēle, "far" and φωνή, phōnē, "voice") is a telecommunications device that is used to transmit and receive electronically or ... http://en.wikipedia.org/wiki/Telephone

Telephone exchange - Wikipedia, the free encyclopedia

In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls.http://en.wikipedia.org/wiki/Telephone_switch

Invention of the telephone - Wikipedia, the free encyclopedia

The modern telephone is the culmination of work done by many individuals, all worthy of recognition for their contributions to the field. Alexander Graham Bell was the first to ... http://en.wikipedia.org/wiki/Invention_of_the_telephone

Telephone booth - Wikipedia, the free encyclopedia

A telephone booth, telephone kiosk, or telephone box is a small structure furnished with a payphone and designed for a telephone user's convenience.http://en.wikipedia.org/wiki/Telephone_box

Antonio Meucci - Wikipedia, the free encyclopedia

Antonio Meucci (April 13, 1808 – October 18, 1889) was an Italian inventor, who developed a form of voice communication apparatus in 1857. Many credit him with the invention of ... http://en.wikipedia.org/wiki/Antonio_Meucci
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Videos found for Telephone

Telephone Pole Failed Rescue Attemp...

Telephone Pole Failed Rescue AttemptClick here to watch the videoVideo - Video

TTC - TELEPHONE

TTC - TELEPHONETTC - TELEPHONEFlash - Video

Unbelievable Lightning Strike on Te...

Unbelievable Lightning Strike on Telephone PolePerfect timing allows this guy to get amazing footage of a huge bolt of lightning explode the power transformer outside his window. Make sure you watch until the end.MPEG 4 - Video

404 Page not Found - Telephone

404 Page not Found - Telephone404 Page Not Found - Désolé !!MPEG 4 - Video

Mr. Telephone Man by New Edition

Mr. Telephone Man by New EditionMr. Telephone Man music video by New Edition added on 2007-08-10Flash - Video

Answers for Telephone

Alena Btelephone!!!?Alena BOn March 10, 1876, in Boston, Massachusetts, Alexander Graham Bell invented the telephone. Thomas Watson fashioned the device itself; a crude thing made of a wooden stand, a funnel, a cup of acid, and...atlas_junkieHow do telephone poles suddenly start sprouting branches?atlas_junkieNorway maple helicoptersclaudia bHow an international telephone call is sent and received?claudia bThis sounds like a homework question.Neptune221Does a cordless home telephone exists that incorporates multiple cell phones via bluetooth?Neptune221yes, there is....Uniden!!! Use your cell phone minutes on your land line? Now you can with the feature-loaded Uniden ELBT595 5.8 GHz 1-Line Digital Expandable Phone with Bluetooth® capability! In ...Starz CIs it possible to run electrical appliances from the telephone socket?Starz Cok, you sound like you're trying to get some free power here. If by appliances you mean stuff like microwave, kitchen appliances, etc, the answer is NO. Yes, your phone line has a 48V difference...
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