Data Transmission

Data Transmission

1. Codec

   • a device or program that compresses data to enable faster transmission and decompresses received data.
   • Codecs accomplish the conversion by sampling the audio signal several thousand times per second. For instance, a G.711 codec samples the audio at 64,000 times a second. It converts each tiny sample into digitized data and compresses it for transmission. When the 64,000 samples are reassembled, the pieces of audio missing between each sample are so small that to the human ear, it sounds like one continuous second of audio signal. There are different sampling rates in VoIP depending on the codec being used

2. The 3 common modes of transmission with examples

   • Simplex
     • A radio broadcast
   • Half duplex
     • Manufacturing monitoring system. Sends a message and responds
   • Full Duplex
     • Telephone system

3. Parallel and Serial

4. Client-side and server side