Round-trip delay time
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In telecommunications, the term round-trip delay time has the following meanings:
1. The elapsed time for transit of a signal over a closed circuit.
Note: Round-trip delay time is significant in systems that require two-way interactive communication such as voice telephony or ACK/NAK data systems where the round-trip time directly affects the throughput rate. It may range from a very few microseconds for a short line-of-sight (LOS) radio system to many seconds for a multiple-link circuit with one or more satellite links involved. This includes the node delays as well as the media transit time.
2. In primary or secondary radar systems, the time required for a transmitted pulse to reach a target and for the echo or transponder reply to return to the receiver.
Source: from Federal Standard 1037C and from MIL-STD-188