Chapter 5 Flashcards
___________ communicated by covering and uncovering a bonfire with a blanket to produce smoke signals or by beating drums.
Native Americans
Used to convey messages from about 700 B.C.E
Carrier pigeons
It is where the first long-distance communication systems were based on (e.g. drums and horns, smoke signals and beacon fires)
Signals of sound and light
_________ alerted the British of the arrival of the Spanish Armada in 1588 C.E.
Signals fires
The Chinese used ______ as signals to warn of an imminent attack on the Great Wall.
rockets
The __________ sent signals at night by raising and lowering a lantern, which coincidentally was the same way Paul Revere was signaled with news of the arrival of the British.
British Navy
Used in traditional long distance communication until almost 1800
Horse -mounted dispatch riders
He developed an optical telegraph (semaphore) system of stations built on rooftops or towers that were visible from a great distance in 1793.
Frenchman Claude Chappe
Developed another type of optical telegraph system with ten collapsible iron shutter, which when placed in various positions formed combinations of numbers that were translated into letters, words, or phrase.
Swede A.N. Edelcrantz
Transmitted the first practical electrical signal in 1830, by sending electricity through a long set of wires to produce electromagnetism that was used to ring a bell.
Joseph Henry
Patented the first functional electrical communication system in 1831: the electric telegraph with its system of electrical impulses identified as dots and dashes that eventually became known as Morse Code.
Samuel Morse
The first message sent by electric telegraph.
“What hath God wrought”
Invented an electrical speech machine that transmitted voice over wires and became known as the telephone.
Alexander Graham Bell
When did Alexander Graham Bell invented the telephone.
March 10, 1876
Italian inventor who demonstrated the first radio transmission in 1895 that was received out of a line of sight on the grounds of his family estate in Italy.
Gugliemo Marconi
Italian physicist who invented a pantelegraph in 1865 for transmitting pictures, the first commercial fax system.
Giovanni Caselli
When was the first transmission of pictures over telephone wires was publicly demonstrated.
May 19, 1924
Is the transmission, emission, or reception of signs, signals, writing, images, sounds, or information of any nature by wire, radio, optical or other electromagnetic systems.
Telecommunication
Uses electricity, light (visible and infrared), or radio waves to transmit signals that carry voice and data transmissions.
Telecommunication System
Is a telecommunications device that functions as a transmitter and receiver.
Transceiver
Is the range between the highest and lowest frequencies of transmission, measured in hertz (Hz) cycles per second. It is a measure of the information capacity.
Bandwidth
The conversion of useful sound or data into electrical impulses.
Analog transmission
Involves a transmission of a signal that varies in voltage to represent one of two separate states. Offers a rapid method of voice and nonvoice transmission.
Digital transmission
Is a collection of communication equipment and devices that are interconnected so they can communicate in order to share data, hardware, and software or perform an electronic function.
Telecommunications Network
