ITU-T Rec. I.327 (1991) – B-ISDN FUNCTIONAL ARCHITECTURE
FOREWORD
Preamble to B-ISDN Recommendations
1 Introduction
2 General architecture of the B-ISDN
3 Architectural aspects of the B-ISDN
    3.1 Low Layer capabilities
    3.2 High Layer capabilities
4 Location of functions in the B-ISDN
    4.1 Overall
    4.2 Partitioning of the overall B-ISDN connection
        4.2.1 Connection elements
        4.2.2 Functional groups in the B-ISDN connection elements
        4.2.3 B-ISDN connection element generic description
    4.3 Functional architecture models for the B-ISDN
ANNEX A – Support of connectionless data services in a B-ISDN
APPENDIX 1 – Examples for functional architecture models for B-ISDN
ANNEX B – Alphabetical list of abbreviations used in this Recommendation