CONTENTS

Policy on Intellectual Property Right (IPR)
Annex 1  System characteristics and operational procedures  for setting up calls and passing data messages
 1 General
 2 Mobile to gateway
 3 Gateway to mobile
 4 Fixed user to gateway
Annex 2  Contents of DSC messages used to establish initial contact  between the maritime mobile user and the gateway
 1 General
 2 DSC calling messages originated by mobile user and gateway acknowledgements
Mobile calling message
Gateway acknowledgement message
 3 DSC calling messages originated by gateway and mobile acknowledgements
Gateway calling message
Mobile acknowledgement message
 4 DSC position request messages originated by gateway and mobile acknowledgements
Position request call
Position request acknowledgement
Annex 3  Protocol and structure of messages used to pass data over the working channel  between the maritime mobile user and the gateway
 1 General
        1.1 Physical layer
        1.2 Data link layer
        1.3 Network layer
        1.4 Reliable transfer server (RTS)
        1.5 Application layer
 2 Reliable transfer server (RTS)
        2.1 General
        2.2 Messages
                  2.2.1 Types of message
                  2.2.2 Control messages
                  2.2.3 Data messages
        2.3 Data file compression and decompression
        2.4 Data file segmentation and desegmentation
                  2.4.1 Header field
                  2.4.2 Control field
                  2.4.3 Information field
                  2.4.4 Data unit control sequence
        2.5 Mechanism for data flow control and synchronization
        2.6 Encryption and decryption of segments of data
 3 ARQ scheme
        3.1 General
        3.2 Data frames
                  3.2.1 Frame structure
                  3.2.2 Types of frames
Annex 4  Technical characteristics of DSC and HF modems
 1 DSC modems
 2 HF modems