Telecommunications

because the signal is the broad

In the 1870s, two inventors Elisha Gray and Alexander Graham Bell both independently designed devices that could transmit speech electrically (the telephone). Both men rushed their respective designs to the patent office within hours of each other, Alexander Graham Bell patented his telephone first. Elisha Gray and Alexander Graham Bell entered into a famous legal battle over the invention of the telephone, which Bell won. The telegraph and telephone are both wire-based electrical systems, and Alexander Graham Bell's success with the telephone came as a direct result of his attempts to improve the telegraph. When Bell began experimenting with electrical signals, the telegraph had been an established means of communication for some 30 years. Although a highly successful system, the telegraph, with its dot-and-dash Morse code, was basically limited to receiving and sending one message at a time. Bell's extensive knowledge of the nature of sound and his understanding of music enabled him to conjecture the possibility of transmitting multiple messages over the same wire at the same time. Although the idea of a multiple telegraph had been in existence for some time, Bell offered his own musical or harmonic approach as a possible practical solution. His "harmonic telegraph" was based on the principle that several notes could be sent simultaneously along the same wire if the notes or signals differed in pitch. By October 1874, Bell's research had progressed to the extent that he could inform his future father-in-law, Boston attorney Gardiner Greene Hubbard, about the possibility of a multiple telegraph. Hubbard, who resented the absolute control then exerted by the Western Union Telegraph Company, instantly saw the potential for breaking such a monopoly and gave Bell the financial backing he needed. Bell proceeded with his work on the multiple telegraph, but he did not tell Hubbard that he and Thomas Watson, a young electrician whose services he had enlisted, were also exploring an idea that had occurred to him that summer - that of developing a device that would transmit speech electrically. While Alexander Graham Bell and Thomas Watson worked on the harmonic telegraph at the insistent urging of Hubbard and other backers, Bell nonetheless met in March 1875 with Joseph Henry, the respected director of the Smithsonian Institution, who listened to Bell's ideas for a telephone and offered encouraging words. Spurred on by Henry's positive opinion, Bell and Watson continued their work. By June 1875 the goal of creating a device that would transmit speech electrically was about to be realized. They had proven that different tones would vary the strength of an electric current in a wire. To achieve success they therefore needed only to build a working transmitter with a membrane capable of varying electronic currents and a receiver that would reproduce these variations in audible frequencies. On June 2, 1875, Alexander Graham Bell while experimenting with his technique called "harmonic telegraph" discovered he could hear sound over a wire. The sound was that of a twanging clock spring. Bell's greatest success was achieved on March 10, 1876, marked not only the birth of the telephone but the death of the multiple telegraph as well. The communications potential contained in his demonstration of being able to "talk with electricity" far outweighed anything that simply increasing the capability of a dot-and-dash system could imply. Alexander Graham Bell's notebook entry of 10 March 1876 describes his successful experiment with the telephone. Speaking through the instrument to his assistant, Thomas A. Watson, in the next room, Bell utters these famous first words, "Mr. Watson -- come here -- I want to see you." Born on March 3, 1847, in Edinburgh, Scotland, Alexander Graham Bell was the son and grandson of authorities in elocution and the correction of speech. Educated to pursue a career in the same specialty, his knowledge of the nature of sound led him not only to teach the deaf, but also to invent the telephone.

A telephone hook or switchhook indicates when the phone is hung up, It is an electrical switch that often has a lever or magnetic button in the cradle where the handset is hung up when the call ends.

Try 2338...worked for me

The basics of the telegraph include electricity, which is electromagnetic energy. In the modern era, we see the use of a telegraph key to complete an electric circuit, and the dots (dits) and dashes (dahs) are sent out through the air using a transmitter that generates electromagnetic waves. Some might call these radio waves, and this is wireless telegraphy.

Yes, Yes you can transfer money to and from the U.S from, and to India.

For security do not place cash in envelopes unless you pay a premium rate insurance as it is possible that this can be stolen.

in the 1950s, when government agencies began using large computers. (;

telephone

SDLC is more like a" waterfall" methodology, you have to of completed one task b4 you continue to the next task, one major weakness of SDLC is that the user is unable to present feedback until the full project is completed.

It depends on what the company is providing.

The fifth largest provider of terrestrial mobile phone network operators measured by number of subscribers (and by proportionate subscribers, if the company has holdings in other operators).is América Móvil in Mexico.

The fifth largest ISP service provider in the world is Chunghwa Telecommunications (CHT), based in Taipei, Taiwan.

Telegraph can only communicate by an on/off method (Morse code), whereas telephone can communicate a complex waveshape.

Interestingly, that means that digital communication preceeded analog.

is the set of standard rules for data representation, signaling, authentication and error detection required to send information over a communications channel

Yes, if the fax is being sent to a long distance number. You dial a fax number on a fax machine exactly the same way that you would dial the same telephone number on a landline telephone at the same location. If the phone line you have the fax machine connected to cannot call long distance, then the fax machine will not be able to send a fax to a number outside your local calling area.

No, unless you set up a network with router. Check here: Ethernet Home Network Setup Tutorial http://www.home-network-help.com/home-network.html Wireless Network Setup Tutorial http://www.home-network-help.com/wireless-network.html No, but you can network more than one computer on the same DSL modem.

Yes it was after he said his famous words to his assistant Watson

As the Bose 321 has its own universal remote, it is unlikely that a code-based remote would operate all of the functions. It would be easier to use the Bose remote program the functions of the TV and other units. If you have lost your Bose remote, it is likely that only an advanced remote, such as the Logitech Harmony series would be able to replace it.

It probably depends on what cell phone you have.

Even though these networks are not compatible, there is a way to transfer the contacts, check out http://sim-reader.com.

The program is called SIM Manager, it is compatible with all types of SIM cards - 2G, 3G, R-UIM and Nextel. Once you read the data from one card, you can write it to any other supported card type.

Note that a Nextel phonebook entry has many properties (name, number, mobile number, email, etc), while GSM cards only have a name and a number - so naturally, some of your Nextel entries will be mapped to more than one GSM phonebook entries.

DSL Extreme is designed to be superior to DSL; offering faster internet services. If you feel that the benefits are worth the cost, you may consider it a good investment.