chap2-bfigs

chap2-bfigs - CSC 311 Transmission Media and Codes CSC 311...

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CSC 311 Transmission Media and Codes
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CSC 311 Factors that determine best way to connect devices cost of a connection amount of information that can be transmitted per unit time (bit rate) immunity to outside interference ( noise) susceptibility to unauthorized listening (security) logistics (location) mobility (wired or wireless)
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CSC 311 Once the devices are connected, we must have standards to ensure the devices speak the same “language”. For example: do we use digital or analog signals? What signal levels and encoding schemes are being used.
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CSC 311 Different signal types.
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CSC 311 How are the signals transmitted from one place to another: There are three basic methods or media: conductive metal….coaxial cable or twisted pair fiber optic ….glass or plastic electromagnetic waves We must consider cost and bit rate when making the selection. higher bit rate may justify higher cost etc.
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CSC 311 What is a signal. Many analog signal exhibit a sine wave pattern as shown in the next figure.
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CSC 311 A periodic signal Period is time to complete one cycle Frequency is number of cycles per second or hertz (Hz) 60 Hz is 60 cycles per second P = 1/F F = 1/P
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CSC 311 Any given transmission medium can accommodate signals within a given frequency range. BANDWIDTH: equals the difference between the highest and lowest frequencies that can be transmitted. For example: a telephone signal can handle frequencies between 300 Hz and 3300 Hz, giving a bandwidth of 3000Hz. Sometimes bandwidth and bit rate are used interchangeably, but this is not technically correct though there is a strong relationship between them.
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CSC 311 Transmission Media: twisted pair coaxial cable optical fiber wireless
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CSC 311 Oldest transmission media is conductive metal 1837 Morse telegraph Example above is a one way telegraph.
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Copper wire is most commonly used, usually in twisted pair configuration. More twists per inch, better performance
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This note was uploaded on 02/10/2012 for the course CSC 311 taught by Professor Whitston,h during the Spring '08 term at S. Alabama.

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chap2-bfigs - CSC 311 Transmission Media and Codes CSC 311...

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