Article 3 Interoperability and performance requirements

Mode S operators shall ensure that the radar head electronics constituent of their Mode S interrogators using an operational interrogator code:

1. 1..

   support the use of SI codes and II codes in compliance with the International Civil Aviation Organisation provisions specified in Annex I point 1;

2. 2..

   support the use of II/SI code operation in compliance with the requirements specified in Annex III.