SignallingWithCables

SignallingWithCables - Communication Architectures Sending...

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Communication Architectures Communication Architectures Sending The Signal Sending The Signal IST125 Owens Community College
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Methods Of Sending Signals Audio Audio Visual Visual Wires Wires Wireless Wireless
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Early Signals Early Signals Voice Distance limitation Whistles, drums other instruments increased distance Visual Line of site Smoke signals Needed Daylight Messages had to be short
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More Visual Methods More Visual Methods Mirrors Limited to sun lit days Complicated code needed Longer messages possible Flags Limited messages Signal Towers All three affected by bad weather
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Voice / Analog Communication Voice / Analog Communication The precursor to digital data networks was voice. The development of analog voice networks during a 100-year period that began in the mid-nineteenth century. A pure tone is simply a sine wave vibrating at a certain frequency
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Recording The First Recording The First Sound - Edison Sound - Edison You spoke into Edison's device while rotating the cylinder, and the needle "recorded" what you said onto the tin. So, as the diaphragm vibrated, so did the needle, and those vibrations impressed themselves onto the tin. To play the sound back, the needle moved over the groove scratched during recording. During playback, the vibrations pressed into the tin caused the needle to vibrate, causing the diaphragm to vibrate and play the sound.
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The First Analog System The First Analog System Who or what is Ma Bell? 1910 Interstate Commerce Commission (ICC) granted monopolies to telephone companies within their service area. Used analog signals or waves to transmit voice. Transmission was both ways at once
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Wires and Wireless Wires and Wireless 1844 Samual Morse invented telegraph Sent dots and dashes representing letters over copper wire Up to 50 w.p.m Ticker A telegraph-based system for sending stock and commodity quotations. The Tickers were one of the first “user friendly” communication devices for the masses.
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Baudot - The 5 bit code Baudot - The 5 bit code Used by early TTYs (Teletypes) With 5 bits, you could have 32 combinations. Working the Baudot keyboard required a lot of skill. The operator had to keep up a steady unvarying, rhythmic pace. The usual speed of operation being 180 letters per minute. The signals from the line coming inare stored on a set of five electromagnets that looked like piano keys arranged to be easy to remember. The combination is then decoded to print the character on paper tape.”
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Morse Code Morse Code "Morse Code" is essentially a simple way to represent the letters of the alphabet using patterns of long and short signals. A unique pattern is assigned to
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SignallingWithCables - Communication Architectures Sending...

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