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