Foreword
1 Scope
2 Normative references
3 Definitions and abbreviations
  3.1 Definitions
  3.2 Abbreviations
4 Configuration and application
  4.1 Configuration
  4.2 Application
  4.3 Modelling and relationship between the access
       digital section and the ET
5 Functions
  5.1 B-channel
  5.2 H0-channel
  5.3 H1-channel
  5.4 D-channel
  5.5 Bit timing
  5.6 Octet timing
  5.7 Frame alignment
  5.8 CRC-4 procedure
  5.9 M-channel
  5.10 Power feeding
  5.11 Operation and maintenance of the access digital
       section
6 Signal transfer delay
7 Jitter
  7.1 Output/input jitter at T reference point
  7.2 Jitter at the V3 reference point
8 Operation and maintenance
  8.1 Control facilities
       8.1.1 Loopbacks
  8.2 Monitoring
       8.2.1 Functions
       8.2.2 Defect conditions and consequent actions
  8.3 Error performance monitoring
9 Operation and maintenance procedures
  9.1 Partitioning of functions
  9.2 Definitions of signals at the T reference point
  9.3 Definition of signals at the V3 reference point
  9.4 Definition of ET layer 1 state machine
  9.5 Definition of DS state machine
       9.5.1 DS states
       9.5.2 DS state transition table
Annex A (normative): System management
        requirements
A.1 Introduction
A.2 System management requirements
    A.2.1 General
    A.2.2 Error indications
    A.2.3 Loopback operations
    A.2.4 Information to be sent in the D-channel
          during loopback operation
    A.2.5 Configuration control
A.3 Handling of CRC error information in the ET
A.4 Definition of ET layer 1 state machine
    A.4.1 ET layer 1 states
    A.4.2 PH and MPH primitives
          A.4.2.1 The repertoire of PH and MPH
                  primitives
          A.4.2.2 Repertoire of MPH primitives
    A.4.3 ET layer 1 state transition table
          A.4.3.1 Definition of notations
          A.4.3.2 Classification of ET states
Annex B (normative): Combined ET and LT functions
Annex C (normative): Conformance testing
Annex D (informative): Bibliography
Annex E (informative): NT1 functions with 2 048 kbit/s
        and Option 2
History