CSC 1212- Data Comm

• Data communication


  The exchange of digital data between two devices via transmission medium over a network
• Telecommunication


  The exchange of information over significant distances using electrical signals or electromagnetic waves

  
• Examples of telecommunication


  • Telephone network
  • Radio broadcasting system
  • Computer networks
  • Internet
• Data communication is a subset of telecommunications
• 5 components of a data communication system

  • Message
  • Sender
  • Receiver
  • Transmission medium
  • Protocol

  
• Protocol


  A set of rules that govern data communications, representing an agreement between the communicating devices

  
• 3 elements of a protocol

  • Syntax
  • Semantics
  • Timing
• 6 components of a telecommunication system

  • Input and output devices
  • Telecommunication channels
  • Telecommunication processors
  • Control software
  • Messages
  • Protocols
• 4 fundamental characteristics of effective data communications

  • Delivery
  • Accuracy
  • Timeliness
  • Jitter
• Jitter


  The variation in the packet arrival time, the uneven delay in the delivery of audio or video packets

  
• Internet


  The global system of interconnected computer networks that use the Internet protocol suite to link devices worldwide
• Intranet


  A private network contained within an enterprise that is used to securely share company information and computing resources among employees
• Extranet


  An organization's private network available only for selected users, connecting to third parties like vendors, customers and partners in a secure and controlled network
• Internet Service Provider (ISP)


  A company that provides access to the internet to both personal and business customers, and may also provide other services including email, domain registration and web hosting
• Networking


  A group of computers (nodes) and other devices connected by a communication medium, configured with a wired/wireless system to send/receive data to many locations
• 3 types of networks

  • Local Area Network (LAN)
  • Metropolitan Area Network (MAN)
  • Wide Area Network (WAN)
• 10 components of computer networks

  • Servers
  • Clients
  • Transmission Media
  • Shared data
  • Shared printers and other peripherals
  • Network Interface Card
  • Local Operating System
  • Network Operating System
  • Hub
  • Switch
• Standards


  Models/guidelines so that all products can work together, developed by cooperation among government regulatory agencies, forums and standards creation committees
• Purposes of standards


  • To create and maintain an open and competitive market for equipment manufacturers
  • To guarantee national and international interoperability of data
• Malaysian Communications and Multimedia Commission (MCMC)


  A regulatory body that is granted jurisdiction over communications and multimedia activities in Malaysia, including the authority to enforce laws and to supervise the conduct of providers of communications and multimedia services