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NOC Network Operations Centre. This centre is monitoring the entire network in relation to the communication.
Optimum Traffic Frequency is usually the most effective frequency for ionospheric reflection of radio waves between two specified points on Earth. Commonly is taken as 85 % of MUF.
POR is the Pacific Ocean Region. This region is one of the four Inmarsat satellite coverage areas
A receiver is a device, such as a part of a radio, television set, or telephone, that receives incoming radio signals and converts them to perceptible forms, such as sound or light.
Radio Telephony - Radio communication known as RT uses a Tx (radio transmitter) to send out radio waves of a certain frequency and a Rx (radio receiver) to receive the radio waves at the same frequency. Radio waves consist of electro-magnetic energy in specific frequency bands within the radio frequency spectrum. Frequency of waves means the number of occurrences of a wave per second. For example, marine VHF RT works in the VHF part of the marine radio frequency spectrum, which extends between 156 MHz to 174 MHz.