DATA COMMUNICATIONS

DATA COMMUNICATIONS

1. Definitions

   • Communication
     • A process of exchange of ideas between a sender and a receiver
   • Data Communication
     • A process of exchange of digital information between computers.
   • Telecommunications
     • Refers to a process that permits exchange of information using signals.
   • Networking
     • A system of connection between computer made to share data.

2. Components

   • Information Source
     • A device that generates data.
   • Transmiiter
     • Encodes the data in a form that it can be transmitted.
   • Channel
     • It refers to the method on how the data will be transmitted.
   • Receiver
     • Decodes the data back to its original form to understood.
   • Information Destination
     • A device that accepts the data.
   • Noise
     • It refers to any unwanted signal that interferes the wanted signals.
     • External Noise
       • Industrial
       • Static
       • Space
     • Internal Noise
       • Thermal
       • Shot
       • Transmit Time
       • Flicker

3. Data Transmission Basis

   • Direction of the Exchange
     • Simplex
       • Flow of data is in one direction only.
     • Half Duplex
       • Flow of data can be both way but not simultaneously.
     • Full Duplex
       • Flow of data can be both way simultaneously.
   • Number of Bits sent simultaneously
     • Serial Transmission
       • Data bits are sent at one bit at a time.
     • Parallel Transmission
       • Multiple bits are sent all at the same time through multiple wires.
   • Synchronization between Transmitter and Receiver
     • Synchronous Transmission
       • Transmission of bits is at a regular time interval.
     • Asynchronous Transmission
       • Transmission of bits is at an irregular time interval.