Transmission Modes

There are 3 different transmission modes

1. Simplex
    Message transmission only in one direction. No backward transmission.
    Eg: Radio.

2. Duplex
    Message transmission in both directions; one direction at a time.
    Eg: Wireless walkie talkie (one way transmisson).
    Specified one way transmission because now there is two way transmission wireless walkie talkie.
   
3. Full Duplex
    Message transmission in both directions simultaneously; both directions at a time.
    Eg: Mobile Phone.