CONTENTS

 1     Introduction
 2     Conversion of information elements
        2.1     Signalling System R2
        2.2     Signalling System No. 7 (TUP)
        2.3     Signalling System No. 5
 3     Incoming INMARSAT aeronautical logic procedures (air-to-ground calls)
 4     Outgoing INMARSAT aeronautical logic procedures (ground-to-air calls)
 5     Interworking of INMARSAT aeronautical signalling system with itself
 6     Interworking of incoming INMARSAT aeronautical to Signalling System R2
 7     Interworking of Signalling System R2 to outgoing INMARSAT aeronautical
 8     Interworking of incoming INMARSAT aeronautical to Signalling System No. 7 (TUP)
 9     Interworking of Signalling System No. 7 (TUP) to outgoing INMARSAT aeronautical
10     Interworking of incoming INMARSAT aeronautical to Signalling System No. 5
11     Interworking of Signalling System No. 5 to outgoing INMARSAT aeronautical