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The current congestion control mechanism used in TCP has difficulty reaching full utilization on high speed links, particularly on wide-area connections. One of reason is that regular TCP lays constraint on the congestion windows in order to keep packet drop rate in control, and the packet drop rate needed to fill a Gigabit pipe using the present TCP protocol is below the currently achievable fiber optic error rates. High Speed TCP and Cubic proposed as modifications of TCP's congestion control mechanism to allow it to achieve reasonable performance in high-speed wide are links.
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