CONTENTS

 1     Introduction
 2     Definitions relating to Circuit Multiplication Equipment
       2.11     Operating modes
                 2.11.1     Point-to-point mode [see diagrams a) and b) of Figure 2]
                 2.11.2     Multi-clique mode (see Figure 3)
                 2.11.3     Multi-destination mode
 3     Requirements for control
        3.1     Reasons for use of Circuit Multiplication Equipments (CME)
        3.2     Integration of Circuit Multiplication Equipments into the circuit-switched international network
        3.3     Factors for signalling functions determination
                  3.3.1     Capabilities and limitations
                  3.3.2     Connection types supported on Circuit Multiplication Equipment links
 4     Connection types and Circuit Multiplication Equipment techniques in the context of signalling
 5     Division of functionality between the International Switching Centre and the Circuit Multiplication Equipment
        5.1     Circuit Multiplication Equipment dynamic load control process
        5.2     Call set-up process
                  5.2.1     Seizure/select
                  5.2.2     Release
                  5.2.3     Dual seizure
        5.3     Change of connection of type after call set-up
        5.4     Inter-dependency between dynamic load control and call set-up process
 6     Control information elements between International Switching Centre and Circuit Multiplication Equipment
        6.1     Information elements for Type 1 Circuit Multiplication Equipment
        6.2     Information elements for Type 2 Circuit Multiplication Equipment
        6.3     Notification of dynamic load control actions
 7     Transmission techniques for International Switching Centre/Circuit Multiplication Equipment signalling
        7.1     External data path
        7.2     Channel associated links
        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.3.1     DCME functions
                  B.3.2     ISC functions
        B.4     Signalling code
        B.5     Signalling procedures
                  B.5.1     Successful call set-up
                  B.5.2     Unsuccessful call set-up
                  B.5.3     Call release
                  B.5.4     Maintenance procedures
        B.6     DCME load tests