Preface
1
Scope
2
Functional aspects
2.1 Dial-in and dial-out considerations
2.2 Identification
2.3 Service aspects
2.4 DTE identification methods
2.5 DCE identification methods
2.6 Dial-in-by-the-DTE and dial-out-by-the-PSPDN operation
2.7 DTE service requirement
2.8 Duplex and half-duplex operation
2.9 Identification protocol
2.10 Negotiation of values
3
DTE service descriptions
3.1 DTE service attributes
3.2 Summary of DTE services
3.3 Non-identified DTE service
3.4 Identified DTE service
3.5 Customized DTE service
4
Interface characteristics (physical layer)
4.1 X.21 interface
4.2 X.21 bis interface
4.3 V-Series interface
5
Link access procedure across the DTE/DCE interface
5.1 Introduction
5.2 Data link layer address assignment
5.3 Use of exchange
identification (XID) frames
5.4 Link set-up disconnection
5.5 Multilink
5.6 Half-duplex operation
6
Packet layer
6.1 Scope and field of application
6.2 Identification and authentication of the DTE using the NUI
selection facility in call set‑up packets
7
X.32 procedures, formats and facilities
7.1 Identification protocol
7.2 Procedures for X.32 optional user facilities
7.3 Coding of the identification protocol elements
7.4 Security grade 2 method
7.5 DCE timers T14 and T14 bis
7.6 DCE timer T15
Annex A – Actions taken by the DCE in the roles of questioning
and challenged parties for security grade
1 and security grade 2 identifications
A.1 Introduction
A.2 Security grade 1 identification
A.3 Security grade 2 identification
Annex B – Abbreviations
Appendix I – Implementation of LAPX
I.1 Introduction
I.2 Control and status functions
I.3 Table of transitions between states
I.4 HDTM/physical layer control and status functions expressed in
terms applicable to a modem interface
Appendix II – RSA public key algorithm
Appendix III – Relationship of timers T14 and T14 bis to the different methods of DTE
identification