1 Scope
2
References
3
Term and definitions
4
Abbreviations
5
Conventions
6
General service aspects
7
Reference configurations
7.1 Configuration when accessing PSPDN services (Case A)
7.2 Configuration for the
ISDN virtual circuit service (Case B)
8
Service aspects
8.1 Access to PSPDN services (Case A)
8.1.1 Service characteristics
8.1.2 User access capabilities
8.1.3
Basic rules
8.1.4 Notification classes
8.2 Access to the ISDN virtual circuit service (Case B)
8.2.1 Service characteristics
8.2.2 User access capabilities
8.2.3
Notification classes for X.25 incoming calls
8.3 Compatibility checking
9
Addressing and routing aspects
9.1 Terminal interface selection
9.1.1 Terminal interface selection by means of
MSN/DDI
9.1.2 Terminal interface selection by means of
ISDN subaddressing
9.2 Access to PSPDN services (Case A)
9.2.1 Channel type selection
9.2.2 Addressing scheme for outgoing calls
9.3 Access to the ISDN virtual circuit service (Case B)
9.3.1 Channel type selection
9.3.2 Addressing scheme for outgoing calls
10 Interworking with dedicated
networks
10.1 Circuit-mode access to PSPDN services (Case A)
10.2 Access to PSPDNs via virtual circuit service (Case B)
11 Packet communications at the
S/T-reference point
11.1 Outgoing access
11.1.1 Circuit-switched access to PSPDN services
(Case A)
11.1.2 Access to the ISDN virtual circuit
service (Case B)
11.2 Incoming access
11.2.1 Access from PSPDN services (Case A)
11.2.2 Access from the ISDN virtual circuit
service (Case B)
11.3 X.25 Virtual call establishment and release
11.3.1 Link layer establishment and release
11.3.2 Packet layer virtual call set-up and
release
11.4 Call clearing
11.4.1
B-Channel
11.4.2 D-Channel
11.4.3 Additional error handling information
11.4.4 Cause mappings
11.5 Access collision
12 Terminal adaptor functionalities
12.1 General
12.2 Physical interfaces
12.3 Access through the B-channel
12.3.1 General
12.3.2 Rate adaption
12.3.3 Signalling
12.3.4 Synchronization
12.4 Access through the D-channel
12.4.1 General
12.4.2 LAPB-LAPD mapping
12.4.3 Signalling
12.5 Access through the B- and D-channels
12.5.1 General
12.5.2 X.25 outgoing call
12.5.3 X.25 Incoming call
12.6 Access through the semi-permanent H-channel
12.6.1 General
12.6.2 Rate adaption
12.6.3
Signalling
12.7 Test loops
12.7.1 Test loops for TA with access through the
B-channel
12.7.2 Test loops for TA with access through the
D-channel
Appendix I – B-channel TA acting on
layers 2 and 3 of X.25
I.1 Introduction
I.2 Call control
I.2.1 Idle phase
I.2.2 Establishment phase
I.2.3 Data transfer phase
I.2.4 Clearing phase
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.1.1 Key to the figures
III.1.2 Example message flow diagrams
III.2 Example conditions for cause mapping
Appendix IV – D-channel TAs requiring
full protocol termination in the TA
IV.1 Introduction
IV.2 Call control
IV.2.1 Idle phase
IV.2.2 Establishment phase
IV.2.3 Data transfer phase
IV.2.4 Clearing phase