Download - Lecture 8 Ppt
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( ) : . 2009
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1837 Samuel Morse : Sir William Cooke Sir Charles Wheatstone . . .
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1858 1866 . . .
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1862 Lincoln . .
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1861 Johan Philip Reis Alexander Graham Bell 1876 Thomas Watson . : .
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1900 . . . 1939 . 25 . .
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Fax . . The Vacuum Tubes. 1907 Lee De Forest Amplifying Triode Tube
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. Sheilded Coaxial Twisted.
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Open Wire Single Wire 4 . .
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Unshielded Twisted Pair (UTP) Cable . UTP . . .
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EIA/TIA (Electronic Industry Association/Telecommunication Industry Association) 6
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Shielded Twisted Pair (STP) Cable UTP . STP . .
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. . 10Base2 Thinnet 10Base5 Thicknet 185 500 . .
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: (Core): (fiber) . (Cladding): .
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(Buffer Coating): , . Jacket PVC
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(Single-Mode Fiber). 9 , 1300 1550 . (Multi-Mode Fiber). 62.5 , 850 1300 (Light Emitting Diodes LED).
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