CODEC

CODEC

1. transmishons

   • Simplex Transmission Sends data in one direction only Example: Tv remote
   • Half-duplex transmission Allows 2 way communication, although only one at a time Example: Walkys talkies
   • Full-duplex transmission Allows 2 way communication at the same time. Example: Phone call

2. parallel and serial transmissions

   • Parallel transmission A number of bits of data are transmitted simultaneously over an equal number of channels It has a very short range
   • Serial Transmission Bits are transmitted one at a time over a single channel. This reduces the cost of cable, but makes data transmission slower. Also more complex, as bytes have to be disassembled into individual bits before transmission and reassembled after. Can be used over longer distances. USB Universal Serial Bus is a serial transmission method introduced to make computer connections consistent
   • Bi-directional Transmission Transmitting in 2 directions. Fibre-Optics – light passes in one direction only, so extra fibres are added to the bundle to carry the signal in the opposite direction

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