telecommunication in USA

today

2017 BCE

Smartphones have changed our lives (and the phones and mobiles themselves)
Smarphones are mini computers and make life much easier.

what is smarphone o intelligent mobile?

2007 BCE

The smarphone is a type of mobile phone built on a mobile computing platform, with greater capacity to store data and perform activities, similar to that of a minicomputer, and with greater connectivity than a conventional mobile phone. The term smart, which is used for commercial purposes, refers to the ability to use as a pocket computer, and even replacing a personal computer in some cases.

Who is the invention of the mobile phone?

1973 BCE

Martin "Marty" Cooper (born December 26, 1928) is an American engineer. He is a pioneer and visionary in the wireless communications industry.
He is considered the "father of the cell phone" and is also cited as the first person in history to make a handheld cellular phone call in public.

How is it lived before the mobile phone?

1970 BCE

Phones were for home, had cable and you could not speak with them on the street.

History of the telephone in USA.

1876 BCE

For a long time Alexander Graham Bell was considered the inventor of the telephone, along with Elisha Gray. However, Bell was not the inventor of this device, but only the first to patent it. This took place in 1876. On June 11, 2001 the United States Congress approved the resolution 269, which recognized that the inventor of the telephone was Antonio Meucci, who called it teletrofono, and no Bell.

Operation.1

1855 BCE

The characteristic impedance of the line is 600 Ω. The most striking is that the signals from the phone to the central unit and those directed to it from travellers that same two-wire line. To be able to combine two signals (electromagnetic waves) travelling in opposite directions on the same line and then be able to separate them using a device called transformer hybrid or hybrid coil, which is nothing more than a coupling of power (duplexer).

Operation.

1855 BCE

Conventional phone consists of two circuits that work together: the circuit of conversation, which is the analog part, and circuit of dialing, dialing and call.
Both signals of voice dialing and call (signs), as well as food, share the same pair of wires; sometimes referred to this «signalling within (voice) band».

History of its invention.

1854 BCE

In 1854,3 Meucci constructed a telephone to connect your office (on the ground floor of his house) with your bedroom (located on the second floor), since your spouse was immobilized by rheumatism. However, Meucci lacked enough money to patent his invention, although Yes patented other inventions that he believed more profitable.

What is telecomunication?

1000 BCE

Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems.
Telecom includes many technologies such as radio, television, phone and mobile telephony, data, computer networks or Internet communications.