L36__rev(2) - Review for Final Exam A layered architecture...

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Review for Final Exam A layered architecture:
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First looked broadly at network categories, then studied the layers, starting at the bottom (physical) layer.
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Network categories Local Area networks - Broadcast ,Ring Metropolitan Area Network - Cable TV, folded unidirectional fiber, bidirectional ring Wide Area Networks - switching and routing. Digital Telephone network Packet networks Virtual circuit networks - ATM and Frame Relay. Internet - (datagrams)
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Some virtual circuit networks. Frame relay -Uses virtual circuits, Data Link Connection Identifier (DLCI). (In address field). Variable size frames DLCI is mapped into a new number at switching nodes, as in general virtual circuit switching systems.
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ATM (Asynchronous Transfer Mode) ATM uses virtual circuits, but it uses fixed size, 53 Byte frames, called cells. Header - Virtual path - virtual circuit indicators ATM network - segmentation and reassembly: Also, Permanent Virtual Circuits can be set up.
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PHYSICAL LAYER frequency concepts. Signals are often forced to be confined to a certain range of frequency content. Linear system: Scale change: Modulation property: The Sampling Theorem : 1. Sampling a bandlimited (W) waveform - (Sampling rate at least 2W samples/sec.) 2. Sending pulses through a bandlimited communication channel: response H(f) . If H(f) = 0 for * f *$ W, up to a maximum 2W pulses per second (bauds) can be sent through the channel - practically, W to 1.5W /sec.
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Channel impairments and limitations Distortion - linear, nonlinear, Noise, Attenuation, Interference, Limited frequency bandwidth Linear distortion: Combat with equalizer filter E(f), so E(f)H(f) has ideal filter characteristic. Nonlinear distortion : nonlinearity creates new difference frequencies (intermodulation distortion).
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  • Spring '09
  • JOHNMETZNER
  • Asynchronous Transfer Mode, telephone network, Multiplexing, virtual circuit, Virtual Circuit Networks

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L36__rev(2) - Review for Final Exam A layered architecture...

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