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The IFF / Mode S transponder product, providing enhanced surveillance (EHS), extended squitter (ES) and TCAS II version 7.1 compatibility in accordance with RTCA DO-181E. Full Mode S Extended Length Message (ELM) capability is available by software upgrade.Replies to ATCRBS interrogation modes 1, 2, 3/A and C. .ADTL has undertaken manufacturing, assembling, testing and integration of these IFF transponders for aircrafts.