Round Trip Time
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In telecommunications, the round-trip delay time (RTD) or round-trip time (RTT) is the length of time it takes for a signal to be sent plus the length of time it takes for an acknowledgment of that signal to be received. This time delay therefore consists of the transmission times between the two points of a signal.*In the context of computer networks, the signal is generally a Network packet|data packet, and the RTT is also known as the ping time. An internet user can determine the RTT by using the ping command. *In space technology, the round-trip delay time or round trip light time is the time light (and hence any signal) takes to go to a space probe and return. Network links with both a high bandwidth (computing)|bandwidth and a high RTT can have a very large amount of data (the bandwidth-delay product) in flight at any given time. Such long fat pipes require a special protocol design. One example is the TCP window scale option. The RTT was originally estimated in TCP by: : RTT =...
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