Download - Circuits, Switches & everyday Communications
Circuits, Switches and everyday Communications
before we talk about circuits…
or switches
we communicate
Bakugan Brawl!
Put them together
What are some of the ways we communicate?
Making paper.
What are they doing in this picture?
Paper was invented in 105 AD.
Making paper 101
Moveable type, Printing Press, 1450 Moveable type
Other uses… /
Take that!!!
Communicate over long distances
How many pieces were sent during 2008?
A. 1 Go-Zillion
B. 254 million
A. 201 Billion
D. 5
Electricity too….
Circuits & Switches
William Gilbert
1600 AD - first person to
apply the term, “electric”.
Otto Von Guericke
Invented the “elektrisiermaschine” or the
first power generator
Benjamin Franklin
Famous for _______________?flying a kite on a stormy day
What he learned from the
experiment was that “electricity”
can be fluid or “flow” from one
point to another.
A Belectricity
wow…wow…wow…
Journaling Experiments
Experimentation or Tinkering
Journal your results
Samuel Morse
Telegraph
Morse Code
Telegraph Operator
That will be a $1.09 please
http://www.youtube.com/watch?v=l882xbFywho
Alexander Graham Bell
sound wavesA B
over a wire
In what year was the first telephone call ever made?
A. 1
B. 2009
A. 1872
D. 1701
Large pepperoni pizza, hold the
anchovies please.
Too many lines
Switch operators
the old solution
You probably drive by them everyday
Tandem Switch
Public Switched Telephone Network (PSTN)
Leominster
Westford
KEY Signaling Voice Path
Tandem Switch
yada, yada, yada
Central Office Switch
Central Office Switch
Signaling Switch
Communications built on fundamentals
A Circuit Network
Signaling System 7 (SS7)
Central Office Switch
Central Office Switch
Public Switched Telephone Network (PSTN)
A Bsound over electricity
All of what we’ve spoken about also allows you to access the
World Wide Web…
…but that’s for another time.
Thank You