!!! Overview
[{$pagename}] ([RTT]) in [telecommunications] or [Round-trip] delay time (RTD) is the length of [time] ([Lifetime]) it takes for a signal or [packet] to be sent plus the length of [time] it takes for an [acknowledgement] of that signal to be received. [{$pagename}] includes the propagation times for the paths between the two communication [endpoints].

In space technology, the round-trip delay time or round-trip [Lifetime] is the time light (and hence any signal) takes to go to a space probe and return.

In the context of computer [networks], the signal is generally a [data] [packet], and the [RTT] is also known as the "ping" time. An internet user can determine the [RTT] by using the ping command.!! More Information
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