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Slotted ALOHA is a significant improvement over Pure ALOHA in the field of Data Communication and Computer Networks, especially in the context of managing data transmission in shared communication channels. Both protocols belong to the ALOHA family, developed originally for wireless data communication in the 1970s, and are fundamental to the development of modern Medium Access Control (MAC) protocols used in networks such as Ethernet and Wi-Fi. These protocols are designed to resolve the problem of collisions that occur when multiple devices try to send data over a shared medium. Pure ALOHA and Slotted ALOHA are both random access protocols, meaning they allow multiple stations to transmit data whenever they have data to send. However, they differ significantly in how they control the timing of these transmissions, which directly impacts their efficiency and throughput. In Pure ALOHA, stations transmit data packets whenever they are ready, without checking if the channel is free or not. This approach results in a higher chance of collisions, especially in networks with high traffic. When a collision occurs, the data is considered lost, and the station waits for a random backoff time before attempting to retransmit the data. This method can lead to significant inefficiencies, especially as the network load increases. Slotted ALOHA, on the other hand, introduces the concept of time slots. Time is divided into discrete intervals or slots, and each station is required to wait until the beginning of the next time slot to send data. This synchronization reduces the probability of collisions because it ensures that transmissions start at the same time slot boundaries. If two stations transmit in the same slot, a collision still occurs, but the number of possible collision scenarios is significantly reduced compared to Pure ALOHA. The key improvement of Slotted ALOHA over Pure ALOHA lies in the doubling of the maximum throughput. In Pure ALOHA, the maximum theoretical throughput is approximately 18.4% or 1/(2e), where *e* is the base of the natural logarithm. This means that only about 18.4% of the time is effectively used for successful data transmission, and the rest is lost due to collisions or idle time. In contrast, Slotted ALOHA achieves a maximum theoretical throughput of about 36.8% or 1/e. This means that Slotted ALOHA can successfully _______ ______ ____ ________ ________.
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