TIMELIN

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TIMELINE OF THE DEVELOPMENT OF RADIO AND TELECOMMUNICATIONS

Optical Telegraph (1790’s-1800’s)

Electrical Telegraph (1830’s-1840’s)

Image Telegraph (1850’s)

Telephone (1870’s-1880’s)

Teleprinter (1900’s)

Land mobile (1910’s)

Radio relay (1940’s)

Telefax (1960’s)

Cellular radio (1970’s)

TIMELINE OF THE DEVELOPMENT OF RADIO AND TELECOMMUNICATIONS

Videophone (1975’s)

Electronic Mail

(1990’s)

iPhone (2005)

iPad (2010)

OPTICAL TELEGRAPHo a system of conveying

information by means of visual signals, using towers with pivoting shutters, also known as blades or paddles.

o Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position.

OPTICAL TELEGRAPH

ELECTRICAL TELEGRAPHo a telegraph that uses electrical signals,

usually conveyed via telecommunication lines or radio.

o The electromagnetic telegraph is a device for human-to-human transmission of coded text messages.

o The electrical telegraph, or more commonly just 'telegraph', superseded optical semaphore telegraph systems

ELECTRICAL TELEGRAPH

IMAGE TELEGRAPHo Data was transmitted at about four to six

bits per second in the latter half of the 1800s, which was as fast as a human hand could tap out Morse code.

o The unit on the right is the telegraph key. A metal bar on the receiver simply banged against another bar when the current passed through, creating a clicking sound.

IMAGE TELEGRAPH

TELEPHONEo A telephone, or phone, is

a telecommunications device that permits two or more users to conduct a conversation when they are not in the same vicinity of each other to be heard directly.

o First patented in 1876 by Alexander Graham Bell and further developed by many others, the telephone was the first device in history that enabled people to talk directly with each other across large distances.

TELEPHONE

TELEPRINTERo an electromechanical typewriter that can be

used to send and receive typed messages from point to point and point to multipoint over various types of communications channels.

o They were adapted to provide a text-based user interface to early mainframe computers and minicomputers, sending typed data to the computer with or without printed output, and printing the response from the computer.

TELEPRINTER

LAND MOBILEo denotes a wireless communications

system intended for use by terrestrial users in vehicles (mobiles) or on foot (portables).

o Such systems are used by emergency first responder organizations, public works organizations, or companies with large vehicle fleets or numerous field staff. 

LAND MOBILE

RADIO RELAYo Radio stations that cannot communicate directly

due to distance, terrain or other difficulties sometimes use an intermediate radio relay station to relay the signals. Examples include airborne radio relay, microwave radio relay, and communications satellite.

o The American Radio Relay League was founded for this purpose but did not change its name when this became a less important part of its work.

RADIO RELAY

TELEFAXo  the telephonic transmission of scanned printed

material (both text and images), normally to a telephone number connected to a printer or other output device.

o The original document is scanned with a fax machine (or a telecopier), which processes the contents (text or images) as a single fixed graphic image, converting it into a bitmap, and then transmitting it through the telephone system.

TELEFAX

CELLULAR RADIOo A radio communication based on a

network of transmitters each serving a small area known as a cell: used in personal communications systems in which the mobile receiver switches frequencies automatically as it passes from one cell to another.

CELLULAR RADIO

VIDEOPHONEo a telephone with a video display, capable

of simultaneous video and audio for communication between people in real-time.

o Videophone service provided the first form of videotelephony, later to be followed by videoconferencing, webcams, and finally high-definition telepresence.

VIDEOPHONE

ELECTRONIC MAILo Electronic mail, most commonly referred to

as email or e-mail since approximately 1993, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks.

o Some early email systems required that the author and the recipient both be online at the same time, in common with instant messaging. Today's email systems are based on a store-and-forward model. Email servers accept, forward, deliver, and store messages. 

ELECTRONIC MAIL

IPHONEo a line of smartphones designed and marketed

by Apple Inc. It runs Apple's iOS mobile operating system, known as the "iPhone OS" until June 2010, with the release of iOS 4. The first generation iPhone was released on June 29, 2007; the most recent iPhone, the sixth-generation iPhone 5, on September 21, 2012. The user interface is built around the device's multi-touch screen, including a virtual keyboard.

IPHONE

IPADo a line of tablet computers designed and

marketed by Apple Inc., which runs Apple's iOS. The first iPad was released on April 3, 2010; the most recent iPad models, the fourth-generation iPad and iPad Mini, were released on November 2, 2012. The user interface is built around the device's multi-touch screen, including a virtual keyboard.

IPAD