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L15-x1rev - Review for exam 1 Network categories Local Area...

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Review for exam 1 Network categories Local Area networks A) Broadcast network - Any node can send and be received by all others. Metropolitan Area Network - coverage of a city-size area. Cable TV, folded unidirectional fiber, bidirectional ring network
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Wide Area Networks - switching and routing are essential . Digital Telephone network - makes a connection over a route, and the signal flows steadily over the connected path. Packet networks. Internet - (datagrams), each packet is looked at and routed individually based on included address information. Virtual circuit networks
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Protocols and Layered Architecture The layered concept - like the “black box” or modular concept. Layering interaction:
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Standardization Needed for compatibility, economies of mass production. Many organizations -International and national Layered architecture HIGHER LAYERS TRANSPORT LAYER NETWORK LAYER DATA LINK LAYER PHYSICAL LAYER
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PHYSICAL LAYER Limitations to Data Communication rates. frequency concepts needed. Fourier Series, Fourier Transform, Spectral density
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Fourier Transform (finite energy time signals) . Important properties: Linear system: Scale change: Modulation property:
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The Sampling Theorem : 1. Sampling a bandlimited (W) waveform - (Sampling rate at least 2W samples/sec.) Reconstruction from samples: 2. Sending pulses through a bandlimited
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