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CSC 450/550
Part 2: The Physical Layer
CSC 450/550
Summary
(1) Transmission medium
(2) * Switching
(3) The Nyquist limit
(4) The Shannon limit
CSC 450/550
(1) Transmission Medium
‱ Guided Transmission Medium
‱ Magnetic Media
‱ Twisted Pair
‱ Coaxial Cable
‱ Fiber Optics
‱ Unguided Transmission Medium (wireless transmission)
‱ Radio
‱ Infrared
‱ Ultrasound
‱ 

CSC 450/550
(2.1) Circuit Switching
(a) Circuit switching.
(b) Packet switching.
CSC 450/550
(2.2) Message Switching
(a) Circuit switching (b) Message switching (c) Packet switching
CSC 450/550
(2.3) A Comparison
A comparison of circuit switched and packet-switched networks.
CSC 450/550
(3) The Nyquist Limit
For a noiseless channel, the maximum data rate is:
2H log2 V bits/sec
,where H is the channel bandwidth (in Hz) and V
is the number of discrete levels of the signal.
CSC 450/550
(4) The Shannon Limit
The maximum data rate of a noisy channel whose bandwidth is H
Hz, and whose signal-to-noise ratio is S/N, is given by
H log2 (1+S/N).

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1-PhysicalLayer.ppt

  • 1. CSC 450/550 Part 2: The Physical Layer
  • 2. CSC 450/550 Summary (1) Transmission medium (2) * Switching (3) The Nyquist limit (4) The Shannon limit
  • 3. CSC 450/550 (1) Transmission Medium ‱ Guided Transmission Medium ‱ Magnetic Media ‱ Twisted Pair ‱ Coaxial Cable ‱ Fiber Optics ‱ Unguided Transmission Medium (wireless transmission) ‱ Radio ‱ Infrared ‱ Ultrasound ‱ 

  • 4. CSC 450/550 (2.1) Circuit Switching (a) Circuit switching. (b) Packet switching.
  • 5. CSC 450/550 (2.2) Message Switching (a) Circuit switching (b) Message switching (c) Packet switching
  • 6. CSC 450/550 (2.3) A Comparison A comparison of circuit switched and packet-switched networks.
  • 7. CSC 450/550 (3) The Nyquist Limit For a noiseless channel, the maximum data rate is: 2H log2 V bits/sec ,where H is the channel bandwidth (in Hz) and V is the number of discrete levels of the signal.
  • 8. CSC 450/550 (4) The Shannon Limit The maximum data rate of a noisy channel whose bandwidth is H Hz, and whose signal-to-noise ratio is S/N, is given by H log2 (1+S/N).

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