ITU-T Rec. G.763 (10/1998) – Digital circuit multiplication equipment using G.726 ADPCM and digital speech interpolation
Summary
Source
FOREWORD
CONTENTS
Introduction
1 General
    1.1 Scope
    1.2 Purpose
    1.3 Application
2 Definitions relating to digital circuit multiplication equipment (DCME)
3 DCME functions
    3.1 General
    3.2 Purpose
4 Operational modes
    4.1 General
    4.2 Modes of assignment of channels to the bearer structure
5 Interface requirements
    5.1 Transmission interface: trunk side
    5.2 Transmission interface: bearer side
    5.3 Signalling interfaces to switching equipment (ISC)
    5.4 Man-machine interface
    5.5 Operations function interface
    5.6 Local alarms interface
    5.7 External clock interface
    5.8 DCME frame structure
    5.9 BC numbering and use of the bearer frame
6 DCME transmit unit
    6.1 Transmit channel processing function
7 DCME receive unit structure
    7.1 Receive channel processing function
8 On-demand 64 kbit/s circuit handling
    8.1 Overview of establishment and disestablishment of 64 kbit/s unrestricted class connections (transparent circuits)
    8.2 Transparent circuit handler (TCH)
    8.3 On-demand circuit establishment
    8.4 On-demand circuit disestablishment
    8.5 Dual seizure handling
    8.6 Spurious disconnect handling
9 Dynamic load control
    9.1 Overview
    9.2 Load condition calculation (see Note)
    9.3 Voice/voiceband data DLC
    9.4 On-demand 64 kbit/s DLC
10 Test procedures
    10.1 Channel check procedure
    10.2 Internal tests
11 Control channel (CC)
    11.1 CC error protection
    11.2 CC synchronization
    11.3 CC message structure
12 Activity detection and data/speech discrimination
    12.1 Transmit activity detector
    12.2 Data/speech discriminator
    12.3 Signalling detector
    12.4 Receive activity detector
13 DCME synchronization and echo control
    13.1 DCME synchronization
    13.2 Echo control
14 ADPCM encoders and decoders
15 Operations and maintenance functions
    15.1 Configuration of the DCME for operation in a network
    15.2 System management functions
    15.3 Synchronizer
    15.4 Communication links
    15.5 Reports
    15.6 System configuration
    15.7 Failure protection strategy
    15.8 Coordinated traffic rearrangements
    15.9 Voice orderwire (VOW)
    15.10 In-service monitoring
    15.11 Fault conditions and consequent actions
16 Abbreviations
ANNEX A – Examples of DCME transmit/receive unit structure and SDL diagrams
A.1 An example of a DCME transmit unit structure
A.2 An example of a DCME receive unit structure
A.3 An example of DCME SDL diagrams
APPENDIX I – Additional requirements
I.1 Load measurements for voice and voiceband data traffic
I.2 Transmit activity detector threshold and operate time characteristic
I.3 Data/speech discriminator
I.4 2400 Hz tone detector
I.5 Speech detector/echo control device interactions
I.6 Timing synchronization
I.7 Performance