CCITT Rec. X.31 (11/1988) – SUPPORT OF PACKET MODE TERMINAL EQUIPMENT BY AN ISDN
CONTENTS
1 General service aspects
2 Reference configurations
2.1 Configuration when accessing PSPDN services (Case A)
2.2 Configuration for the ISDN virtual circuit service (Case B)
3 Service aspects
3.1 Access to PSPDN services (Case A)
3.2 Access to the ISDN virtual circuit service (Case B)
3.3 Compatibility checking
4 Addressing and routing aspects
4.1 Terminal interface selection
4.2 Access to PSPDN services (Case \A)
4.3 Access to the ISDN virtual-circuit service (Case B)
5 Interworking with dedicated networks
5.1 Circuit-mode access to PSPDN services (Case A)
5.2 Access to PSPDNs via virtual circuit service (Case B)
6 Packet communications at the S/T reference point
6.1 Outgoing access
6.2 Incoming access
6.3 Virtual call establishment and release
6.4 Call clearing
6.5 Access collision
7 TERMINAL ADAPTOR FUNCTIONALITIES
7.1 General
7.2 Physical interfaces
7.3 Access through the B-channel
7.4 Access through the D-channel
7.5 Access through the B and D channel
7.6 Test loops
APPENDIX I – B-channel TA acting on layers 2 and 3 of X.25
I.1 Introduction
I.1 Call control
APPENDIX II – Interconnection of packet mode TE2s which use the circuit-mode bearer service of the ISDN
APPENDIX III – Example message flow diagrams and example conditions for cause mapping
III.1 Example message flow diagrams
III.2 Example conditions for cause mapping
APPENDIX IV – D-channel TAs requiring full protocol terminal in the TA
IV.1 Introduction
IV.2 Call control
APPENDIX V – References