In infrared transmission systems, a steady infrared light that is used (a) to assist the transmitter in locating a receiving station and (b) for keeping the transmitted light pointed in the proper direction for satisfactory reception. [ From Weik '89 ]
POINT OF TRAIN
Meaning of POINT OF TRAIN in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012