ALOHA is a protocol for satellite and terrestrial radio transmissions. In pure Aloha, a user can transmit at any time but risks collisions with other users' messages. "Slotted Aloha" reduces the chance of collisions by dividing the channel into time slots and requiring that the user send only at the beginning of a time slot. Aloha was the basis for Ethernet, a local area network protocol. Pure ALOHA Graph of frames being sent from 4 different stations according to the pure ALOHA protocol with respect to time, with overlapping frames shaded to denote collision. The first version of the protocol (now called "Pure ALOHA", and the one implemented in ALOHAnet) was quite simple: If you have data to send, send the data If, while you are transmitting data, you receive any data from another station, there has been a message collision. All transmitting stations will need to try re sending "later". Boxes indicate frames. Shaded boxes indicate frames which have ...
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