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Principles of Computer Architecture Miles Murdocca and Vincent Heuring Chapter 9: Communication. Chapter Contents. 9.1 Modems 9.2 Transmission Media 9.3 Network Architecture: Local Area Networks 9.4 Communication Errors and Error Correcting Codes 9.5 Network Architecture: The Internet

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Principles of computer architecture miles murdocca and vincent heuring chapter 9 communication
Principles of Computer ArchitectureMiles Murdocca and Vincent HeuringChapter 9: Communication


Chapter contents
Chapter Contents

  • 9.1 Modems

  • 9.2 Transmission Media

  • 9.3 Network Architecture: Local Area Networks

  • 9.4 Communication Errors and Error Correcting Codes

  • 9.5 Network Architecture: The Internet

  • 9.6 Case Study: Asynchronous Transfer Mode


Modem communication
Modem Communication

  • • Communication over a telephone line with modems:


Modulation schemes
Modulation Schemes

  • • Three common forms of modulation:


Pulse code modulation
Pulse Code Modulation

  • • Conversion of an analog signal into a PCM binary sequence:



Transmission media
Transmission Media

  • • Transmisson media. (a) Two-wire open lines; (b) twisted-pair lines; (c) coaxial cable; (d) optical fiber; (e)satellites.



A few network topologies
A Few Network Topologies

  • • (a) Bus; (b) ring; and (c) star network topologies.


Parity
Parity

  • • Even parity bits are assigned to a few ASCII characters:


Check bits
Check Bits

  • • Check bits for a single error correcting ASCII code:


Sec coded a
SEC coded ‘a’

  • • Format for a single error correcting ASCII code:


Sec coded d
SEC Coded ‘d’

  • • Parity computation for an ASCII character in an SEC code:


3 bit sec hypercube
3-Bit SEC Hypercube

  • • Hamming distance relationships among three-bit codewords. Valid codewords are 000 and 111. The remaining codewords represent errors.


Lrc and vrc checking
LRC and VRC Checking

  • • Combined LRC and VRC checking. Checksum bits form even parity for each column.



Internet protocol stack
Internet Protocol Stack

  • • Layering in the TCP/IP protocol suite:



Encapsulation
Encapsulation

  • • Encapsulation in the TCP/IP protocol suite:


Hub vs router vs switch
Hub vs. Router vs. Switch

  • • Configurations shown for (a) a hub; (b) a router; and (c) a switch.


Self routing switch
Self-Routing Switch

  • • A 4´4 self-routing switch based on the bubblesort algorithm:


Tdm vs atm
TDM vs. ATM

  • • (a) Time division multiplexing vs. (b) asynchronous transfer mode.


Format of an atm packet
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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