CCITT REC. G.763 – DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT USING 32 KBIT/S ADPCM AND DIGITAL SPEECH INTERPOLATION
1 General
    1.1 Scope
    1.2 Attributes
    1.3 Application
2 Definitions relating to digital circuit multiplication equipment
    2.1 digital circuit multiplication equipment (DCME)
    2.2 digital circuit multiplication system (DCMS)
    2.3 low rate encoding (LRE)
    2.4 variable bit rate (VBR)
    2.5 digital speech interpolation (DSI)
    2.6 DCME frame
    2.7 transmission channel
    2.8 bearer channel (BC)
    2.9 trunk channel (TC)
    2.10 assignment message
    2.11 assignment map
    2.12 control channel
    2.13 ensemble activity
    2.14 speech activity factor
    2.15 voice band data ratio
    2.16 64 kbit/s unrestricted digital data ratio
    2.17 DCME overload (mode)
    2.18 overload channels
    2.19 average bits per sample
    2.20 transmission overload
    2.21 freeze-out
    2.22 freeze-out fraction (FOF)
    2.23 interpolation gain (IG)
    2.24 transcoding gain (TG)
    2.25 DCME gain (DCMG)
    2.26 clique
    2.27 multi-clique mode
    2.28 multi-destination mode
3 Tutorial
    3.1 Use of digital circuit multiplication system (DCMS)
    3.2 Location
    3.3 Transmission requirements
    3.4 DCME gain (DCMG)
    3.5 ISDN bearer services
    3.6 Restoration of services
    3.7 Control of transmission overload
    3.8 Control channel
4 DCME functions
    4.1 Digital speech interpolation
    4.2 DCME low rate encoding algorithm
    4.3 DCME gain
    4.4 DCME bearer services
    4.5 Operational modes
    4.6 Activity detector
    4.7 Data/speech discrimination
    4.8 Control channel
    4.9 Communication to the ISC
    4.10 Trunk channel idle noise level detection and injection
    4.11 Time slot interchange (TSI)
    4.12 Signalling transmission
    4.13 Voice-band data transmission
    4.14 Echo protection
    4.15 Bearer channel preassignment
5 Interfaces
    5.1 Transmission interface; trunk side
    5.2 Transmission interface: bearer side
    5.3 Control interfaces to switching equipment (at the ISC)
    5.4 Man-machine interface
    5.5 Operations function interface(s)
    5.6 Local alarms interface (provisional)
    5.7 External clock interface
6 Timing synchronization
    6.1 General
7 Performance
    7.1 Speech performance
    7.2 Voice-band data performance
8 System management functions
    8.1 Transmission facilities
    8.2 Terminal traffic handling performance
    8.3 Synchronizer
    8.4 Communication links
    8.5 Reports
    8.6 System configuration
    8.7 Failure strategy
9 Maintenance functions and alarms
    9.1 Maintenance functions
    9.2 DCME alarm conditions
APPENDIX I – Timing synchronization
    I.1 Point-to-point operation
    I.2 Multi-clique operation
    I.3 Multi-destination operation
APPENDIX II – Channel state classification and system management statistics
    II.1 Channel state classifications
    II.2 System management statistics
References