Table of Contents

Foreword
Introduction
Normative references
1 Scope
2 General service aspects
3 Reference configurations
  3.1 Configuration when accessing PSPDN services
      (Case A)
  3.2 Configuration for the ISDN virtual circuit
      service (Case B)
4 Service aspects
  4.1 Access to PSPDN services (Case A)
  4.2 Access to the ISDN virtual circuit service
      (Case B)
  4.3 Compatibility checking
5 Addressing and routing aspects
  5.1 Terminal interface selection
  5.2 Access to PSPDN services (Case A)
  5.3 Access to the ISDN virtual circuit service
      (Case B)
6 Interworking with dedicated networks
  6.1 Circuit-mode access to PSPDN services (Case A)
  6.2 Access to PSPDNs via virtual circuit service
      (Case B)
7 Packet communications at the S/T reference point
  7.1 Outgoing access
  7.2 Incoming access
  7.3 Virtual call establishment and release
  7.4 Call clearing
  7.5 Access collision
8 Terminal adaptor functionalities
  8.1 General
  8.2 Physical interfaces
  8.3 Access through the B-channel
  8.4 Access through the D-Channel
  8.5 Access through the B- and D-channel
  8.6 Test loops
Appendix I (informative): B-channel TA acting on layer
                          2 and 3 of CCITT
                          Recommendation X.25
           I.1 Introduction
           I.2 Call control
Appendix II (informative): Interconnection of
                           packet-mode TE2s which use
                           the circuit-mode bearer
                           service of the ISDN
Appendix III (informative): Example message flow
                            diagrams and example
                            conditions for cause mapping
Appendix IV (informative): D-channel TAs requiring full
                           protocol termination in the TA
           IV.1 Introduction
           IV.2 Call control
Annex A (informative): States applicable to packet mode
                       access connection (case B
                       services)
           A.1 Access connection states at the user side
               of the interface
           A.2 Access connection states at the network
               side of the interface
Annex B (normative): Messages for control of packet-mode
                     access connections
           B.1 Alerting
           B.2 Call proceeding
           B.3 Connect
           B.4 Connect acknowledge
           B.5 Disconnect
           B.6 Progress
           B.7 Release
           B.8 Release complete
           B.9 Setup
           B.10 Status
           B.11 Status enquiry
Annex C (normative): Information elements for the
                     control of packet-mode access
                     connections
           C.1 Protocol discriminator
           C.2 Call reference
           C.3 Message type
           C.4 Other information elements
           C.5 Redirecting number
Annex D (informative): Example of ISDN CCITT
                       Recommendation X.25 packet-mode
                       bearer service access on the
                       D-channel through a NT2 with
                       frame handling Functions
History

Abstract

Defines user-network signalling requirements to support: the ISDN packet mode bearer services (both B and D Channels); the application of the ISDN circuit mode 8 kHz structured 64 kbit/s unrestricted bearer service category for access to a Packet Switched Public Data Network (PSPDN); for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunication operators at the T reference point or coincident S and T reference point, by using the Digital Subscriber Signalling System number one (DSS1). Stage three identifies the switching functions and protocols needed to support telecommunication services. Applies to user and network equipment supporting case a) or case b), to be attached at either side of a T reference point or coincident S & T reference points.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	SPS 5