transponder, tag

electronic transmitter/responder which responds to the receipt of suitable modulated or unmodulated downlink signals and transmits predetermined information according to predefined protocols at a predetermined frequency
NOTE: The transmissions can be powered from energy obtained from the downlink or can be assisted by an on-board power supply. Forms the core, but not necessarily the only, function of an OBE. Within the AVI/AEI context it is fitted to AVI/AEI vehicle or equipment and its prime function is to provide the identity of the item, but can also contain additional information. In some special purposes transponders can be installed in fixed positions and read by mobile equipment.

Application Area: Automatic Vehicle and Equipment Identification (AVI/AEI)