CGS 2100C Lecture Notes - Lecture 7: Laser Diode, Remote Control, Death Ray
9 Jul 2016
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Based on the use of only one frequency channel to accommodate the communication. Only one station can transmit or broadcast. Examples are radio am stations, radio fm stations, tv stations: half duplex technology (also known as hdx technology) Uses only one frequency channel to accommodate both transmitting and receiving of communicating devices. All stations can transmit and receive, but not simultaneously (only one station can transmit at a time) Must push a button/switch to switch from receiving to transmitting and vice versa. Ex. ) citizens band (cb) radio, walkie-talkies, military radio equipment. Walkie-talkie has low transmission power; can be used for range of up to 5 miles. Not controlled by a technology protocol that enforces transmission priorities. Transmitting station should end its transmission message by the word over or any other signal that invites other stations to transmit if they wanted to. Microwave communication: high frequency radio signals sent up to 30 miles through the air, line-of-sight communications, satellite transmission.
