ITU-T Rec. I.432 (1991) – B-ISDN USER-NETWORK INTERFACE – PHYSICAL LAYER SPECIFICATION
FOREWORD
Preamble to B-ISDN Recommendations
1 Introduction
2 Physical medium characteristics of the UNI at 155 520 Mbit/s
    2.1 Characteristics of the interface at the TB reference point
        2.1.1 Bit rate and interface symmetry
        2.1.2 Physical characteristics
    2.2 Characteristics of the interface at the SB reference point
3 Physical medium characteristics of the UNI at 622 080 Mbit/s
    3.1 Characteristics of the interface at the TB reference point
        3.1.1 Bit rate and interface symmetry
        3.1.2 Physical characteristics
    3.2 Characteristics of the interface at the SB reference point
4 Functions provided by the transmission convergence sublayer
    4.1 Transfer capability
        4.1.1 Interface at 155 520 Mbit/s
        4.1.2 Interface at 622 080 Mbit/s
    4.2 Transmission frame adaptation
        4.2.1 Physical Layer for the cell-based interface
        4.2.2 Physical Layer for the SDH-based interface
    4.3 Header error control
        4.3.1 Header error control functions
        4.3.2 Header error control (HEC) sequence generation
    4.4 Idle cells
    4.5 Cell delineation and scrambling
        4.5.1 Cell delineation and scrambling objectives
        4.5.2 Cell delineation performance
        4.5.3 Scrambler operation
ANNEX A – Impact of random bit errors on HEC performance
ANNEX B – Impact of random bit errors on cell delineation performance
ANNEX C – Alphabetical list of abbreviations used in this Recommendation