In telecommunication

Telecommunication

Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...

, receive-after-transmit time delay is the time

Time

Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....

 interval between (a) the instant of keying

Keying (telecommunications)

Keying is a family of modulation forms where the modulating signal takes one of two values at all times. The goal of keying is to transmit a digital signal over an analogue channel. The name derives from the Morse code key used for telegraph signaling....

 off the local transmitter to stop transmitting and (b) the instant the local receiver output

Output

Output is the term denoting either an exit or changes which exit a system and which activate/modify a process. It is an abstract concept, used in the modeling, system design and system exploitation.-In control theory:...

 has increased to 90% of its steady-state value in response to an rf signal from a distant transmitter.

The rf signal from the distant transmitter must exist at the local receiver input prior to, or at the time of, keying off the local transmitter.

Receive-after-transmit time delay applies only to half-duplex operation.