ITU-T Rec. I.361 (1991) – B-ISDN ATM LAYER SPECIFICATION
FOREWORD
Preamble to B-ISDN Recommendations
1 Introduction
2 Cell structure coding
    2.1 Cell structure
    2.2 Cell header format and encoding at UNI
        2.2.1 Pre-assigned values of the cell header
        2.2.2 Generic flow control (GFC) field
        2.2.3 Routing field (VPI/VCI)
        2.2.4 Payload type (PT) field
        2.2.5 Cell loss priority (CLP) field
        2.2.6 Header error control (HEC) field
        2.2.7 Reserved (RES) field
    2.3 Cell header format and encoding at NNI
        2.3.1 Pre-assigned values of the cell header
        2.3.2 Routing field (VPI/VCI)
        2.3.3 Payload type (PT) field
        2.3.4 Cell loss priority (CLP) field
        2.3.5 Header error control (HEC) field
        2.3.6 Reserved (RES) field
    2.4 Cell information field
        2.4.1 Pre-assigned values
3 ATM protocol procedures
    3.1 GFC protocol
ANNEX A – Alpahbetical list of abbreviations used in this Recommendation