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ANNEX IIIU.K.II/SI code operation referred to in Article 3(2)
1.Mode S interrogators, when operating with an SI code and if enabled by an appropriate operational parameter, shall also acquire targets through all call replies which are encoded using the matching II code.U.K.
2.Mode S interrogators, when operating with an SI code and if enabled by an appropriate operational parameter, shall consider transponders replying with all call replies encoded using the matching II code as non-SI equipped transponders, irrespectively of the SI capability reported in the data link capability report defined in the document referred to in Annex I point 2.U.K.
3.Mode S interrogators, when operating with an SI code and if enabled by an appropriate operational parameter, shall interrogate transponders lacking SI code capability using the Mode S multisite lockout protocol messages foreseen for II code operation. The II code to be used shall be the matching II code.U.K.
4.Mode S interrogators, when operating with an SI code and if enabled by an appropriate operational parameter, shall be configurable by the operator to either:U.K.
not use lockout on the matching II code for transponders lacking SI code capability, or
use intermittent lockout on the matching II code for transponders lacking SI code capability.
5.Mode S interrogators, when operating with an II code and if enabled by an appropriate operational parameter, shall be configurable by the operator to either:U.K.
not use lockout for transponders which report no SI capability in their data link capability report or cannot report their data link capability, or
use intermittent lockout for transponders which report no SI capability in their data link capability report or cannot report their data link capability.
6.When the II/SI code operation is activated, the lockout maps shall not be taken into account for transponders lacking SI code capability.U.K.