CONTENTS

 1     Scope 
 2     References 
 3     Definitions  
 4     Abbreviations   
 5     GPAD framework           
        5.1     Assumptions          
 6     General configuration       
        6.1     Data stations          
        6.2     Transmission considerations           
        6.3     Protocol sequence 
 7     Elements of procedure     
        7.1     Definition of PDUs and PDU components  
        7.2     Procedures
        7.3     Full/Half-duplex considerations      
        7.4     Timeout function considerations      
        7.5     Link end points association
        7.6     Error detection and recovery          
        7.7     Addressing conventions     
 8     Structure and encoding of Protocol Data Units (PDUs)     
        8.1     PDU types
        8.2     Data transparency  
 9     Classes of procedures      
        9.1     X.42 PAD configuration    
        9.2     Normal Poll Mode class    
        9.3     Selective Poll Mode class – Description of procedures       
        9.4     Poll priority mode class      
        9.5     Encapsulation Mode Class – Description and procedures   
10     Proxy operation  
Annex A – Point to Multipoint (PMP) network    
Annex B – Explanatory notes on the implementation of frame check sequences    
        B.1     Longitudinal Redundancy Check (LRC)     
        B.2     Diagonal Redundancy Check (DRC)         
Annex C    
Annex D – Proxy Operation – X.42 PAD with proxy terminal IP code    
Appendix I