9-1 chapter 9 - communication department of information technology, radford university itec 352...
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9-3 Chapter 9 - Communication Department of Information Technology, Radford University ITEC 352 Computer Organization Modem Communication Communication over a telephone line with modems:TRANSCRIPT
9-1 Chapter 9 - Communication
Department of Information Technology, Radford University ITEC 352 Computer Organization
Principles of Computer ArchitectureMiles Murdocca and Vincent Heuring
Chapter 9: Communication
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Chapter Contents9.1 Modems9.2 Transmission Media9.3 Network Architecture: Local Area Networks9.4 Communication Errors and Error Correcting Codes9.5 Network Architecture: The Internet9.6 Case Study: Asynchronous Transfer Mode
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Modem Communication• Communication over a telephone line with modems:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Modulation Schemes• Three common forms of modulation:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Pulse Code Modulation• Conversion of an analog signal into a PCM binary sequence:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Ideal vs. Transmitted Waves
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Transmission Media
• Transmisson media. (a) Two-wire open lines; (b) twisted-pair lines; (c) coaxial cable; (d) optical fiber; (e)satellites.
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Department of Information Technology, Radford University ITEC 352 Computer Organization
The Seven Layers of the OSI Model
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Department of Information Technology, Radford University ITEC 352 Computer Organization
A Few Network Topologies• (a) Bus; (b) ring; and (c) star network topologies.
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Parity• Even parity bits are assigned to a few ASCII characters:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Check Bits• Check bits for a single error correcting ASCII code:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
SEC coded ‘a’• Format for a single error correcting ASCII code:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
SEC Coded ‘d’• Parity computation for an ASCII character in an SEC code:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
3-Bit SEC Hypercube• Hamming distance relationships among three-bit codewords.
Valid codewords are 000 and 111. The remaining codewords represent errors.
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Department of Information Technology, Radford University ITEC 352 Computer Organization
LRC and VRC Checking• Combined LRC and VRC checking. Checksum bits form even
parity for each column.
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Cyclic Redundancy Checking
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Internet Protocol Stack• Layering in the TCP/IP protocol suite:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
IPv4 Address Classes
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Encapsulation• Encapsulation in the TCP/IP protocol suite:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Hub vs. Router vs.
Switch
• Configurations shown for (a) a hub; (b) a router; and (c) a switch.
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Self-Routing Switch• A 44 self-routing switch based on the bubblesort algorithm:
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Department of Information Technology, Radford University ITEC 352 Computer Organization
TDM vs. ATM• (a) Time division multiplexing vs. (b) asynchronous transfer mode.
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Format of an ATM Packet• Format of an ATM packet. (a) User-to-network interface (UNI) format; and (b) network-to-network interface (NNI)
format.
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Department of Information Technology, Radford University ITEC 352 Computer Organization
Simple ATM Network