Developing of Telecommunications

Июль 30, 2022

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Developing of Telecommunications

Содержание

2. Evolution of Telecommunication Technology Today’s telecommunication technologies have evolved from the earliest smoke signals to almost
3. Early Signaling and Telegraphy Semaphore - a type of signaling, in which visual cues represent letters
4. Early Signaling and Telegraphy 1856 - Western Union Telegraph Company was founded. 1861 – Over two
5. Telephone Technology
6. Telephone Technology
7. Infrastructure Wires criss-crossing cities and states and terminating in several exchanges or central offices. Exchange was
8. Telephone Technology 1878- The first telephone exchange opened in New Haven, Connecticut. Connected 21 separate lines.
9. Telephone Technology In 1889 Almon Strowger developed the automatic switch called the step-by-step. In 1896 he
10. Telephone Technology In 1913, N.J. Reynolds, a Western Electric engineer, developed a better automatic switch, the
11. Telephone Technology In the mid-20th century AT&T integrated electronics into crossbar switches 1965 – first electronic
12. Wireless Technology 1894- Italian physicist Guglielmo Marconi a method of transmitting electromagnetic signals through the air.
13. Early Computing 1822- Charles Babbage “father of computing” Computing - the automatic manipulation of input based
14. Early Computing Electronic Numerical Integrator and Computer (ENIAC) - a multipurpose computer so large that it
15. Early Computing Memory - in the mid-1940s, a U.S. scientist named Jon Von Neumann designed a
16. Early Computing
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Слайд 2

Evolution of Telecommunication Technology
Today’s telecommunication technologies have evolved from the earliest

smoke signals to almost instant global transmission of large amounts of data.

Слайд 3

Early Signaling and Telegraphy
Semaphore - a type of signaling, in which

visual cues represent letters or words.
Morse code - the transmission of a series of short and long pulses (dots and dashes) that represented characters.
Duplexing - simultaneously transmitting a signal in both directions along the same wire.
Multiplexing - simultaneously transmitting an indeterminate number of multiple signals over one circuit.

Слайд 4

Early Signaling and Telegraphy
1856 - Western Union Telegraph Company was founded.
1861

– Over two thousand telegraph offices operated across the United States.

Слайд 5

Telephone Technology

Слайд 6

Telephone Technology

Слайд 7

Infrastructure
Wires criss-crossing cities and states and terminating in several exchanges or

central offices.
Exchange was also known as a switching point because the device used to open and close a circuit is known as a switch.
Operators would connect the circuits and complete the call for the subscriber.
Subscribers refers to a telephone company customer

Слайд 8

Telephone Technology
1878- The first telephone exchange opened in New Haven, Connecticut.
Connected

21 separate lines.

Слайд 9

Telephone Technology
In 1889 Almon Strowger developed the automatic switch called the

step-by-step.
In 1896 he replaced the button-pushing method with a rotary dialer.

Слайд 10

Telephone Technology
In 1913, N.J. Reynolds, a Western Electric engineer, developed a

better automatic switch, the crossbar switch. It used a grid of horizontal and vertical bars, with electromagnets at their ends. The horizontal bars could rotate up and down to connect to specific vertical bars and thus complete circuits.
Original version could complete 10 simultaneous connections.
By the 1970 a single crossbar could connect 35,000 connections.

Слайд 11

Telephone Technology
In the mid-20th century AT&T integrated electronics into crossbar switches
1965

– first electronic switching system was used
Handled up to 65,000 two-way voice circuits.
Until 1970 all telephone switches depended on a continuous physical connection to complete and maintain the call.

Слайд 12

Wireless Technology
1894- Italian physicist Guglielmo Marconi a method of transmitting electromagnetic

signals through the air.
His invention relied on an induction coil.

Слайд 13

Early Computing
1822- Charles Babbage “father of computing”
Computing - the automatic manipulation

of input based on logical instructions.
Difference engine - an English mathematics professor, proposed an automated calculating machine as large as a locomotive and powered by steam.
Herman Hollerith - used his punch card invention to found the Tabulating Machine company which later became known as International Business Machines (IBM).

Слайд 14

Early Computing
Electronic Numerical Integrator and Computer (ENIAC) - a multipurpose computer

so large that it required its own 30 foot by 50 foot room.
ENIAC was first used to assist with ballistics calculations.

Слайд 15

Early Computing
Memory - in the mid-1940s, a U.S. scientist named Jon

Von Neumann designed a computer that was capable of retaining logical instructions for use at any time, even after the computer had been turned off, then on again.
UNIVAC (Universal Automatic Computer) - the first computer designed for business (and not merely scientific purposes), became available in 1951.

Слайд 16

Developing of Telecommunications

Содержание

Evolution of Telecommunication TechnologyToday’s telecommunication technologies have evolved from the earliest

Early Signaling and TelegraphySemaphore - a type of signaling, in which

Early Signaling and Telegraphy1856 - Western Union Telegraph Company was founded.1861

Telephone Technology

Telephone Technology

InfrastructureWires criss-crossing cities and states and terminating in several exchanges or

Telephone Technology1878- The first telephone exchange opened in New Haven, Connecticut.Connected

Telephone TechnologyIn 1889 Almon Strowger developed the automatic switch called the

Telephone TechnologyIn 1913, N.J. Reynolds, a Western Electric engineer, developed a

Telephone TechnologyIn the mid-20th century AT&T integrated electronics into crossbar switches1965

Wireless Technology1894- Italian physicist Guglielmo Marconi a method of transmitting electromagnetic

Early Computing1822- Charles Babbage “father of computing”Computing - the automatic manipulation

Early ComputingElectronic Numerical Integrator and Computer (ENIAC) - a multipurpose computer

Early ComputingMemory - in the mid-1940s, a U.S. scientist named Jon

Early Computing

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