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• ITU-T Rec. Q.50 – SIGNALLING BETWEEN CIRCUIT MULTIPLICATION EQUIPMENTS ...
• 1 Introduction
• 2 Definitions relating to CME
  • 2.1 Digital circuit multiplication equipment (DCME) and CME
  • 2.2 Speech interpolation; digital speech interpolation (DSI)
  • 2.3 Low rate encoding (LRE)
  • 2.4 Speech activity
  • 2.5 CME gain
  • 2.6 Trunk
  • 2.7 Transmission channel, bearer channel
  • 2.8 Freeze-out
  • 2.9 Freeze-out fraction
  • 2.10 Transmission overload
  • 2.11 Operating modes
• 3 Requirements for control
  • 3.1 Reasons for use of circuit multiplication equipments (CME)
  • 3.2 Integration of CMEs into the telephone network
• 4 Bearer services and CME techniques in the context of signalling
• 5 Division of functionality between the ISC and the CME
  • 5.1 CME dynamic load control process
  • 5.2 Call set-up process
  • 5.3 Inter-dependency between dynamic load control and call set-up process
• 6 Control information elements between ISC and CME
  • 6.1 Information elements for Type 1 CME
  • 6.2 Information elements for Type 2 CME
• 7 Transmission techniques for ISC-CME signalling
  • 7.1 External data path
  • 7.2 Channel associated signalling
  • 7.3 Common channel signalling in the PCM access stream
• 8 Recommendation for signalling system
• 9 Example systems
• ANNEX A – Controlled DCME interface utilizing time-slot 16
• ANNEX B – Example of a signalling system between DCME and ISC
  • B.1 General
  • B.2 Physical level of interface
  • B.3 Distribution of functions between DCME and ISC
  • B.4 Signalling code
  • B.5 Signalling procedures
  • B.6 DCME load tests