CONTENTS

 1     Scope
 2     References
 3     Terms and definitions
 4     Abbreviations
 5     Recovery mechanisms for international multiplex sections
        5.1     Multiplex section protection
                  5.1.1     Automatic switching to alternative MS
                  5.1.2     Forced switching to alternative MS
                  5.1.3     Switching time (automatic switching)
                  5.1.4     Criteria for automatic return to normal in the case of automatic protection (revertive)
        5.2     Multiplex section restoration
 6     Recovery mechanisms for international connections in the SDH VC trail layer
        6.1     Subnetwork connection recovery mechanisms
                  6.1.1     Automatic protection for subnetwork connections
                  6.1.2     Manual protection for subnetwork connections
                  6.1.3     Subnetwork connection recovery times
        6.2     VC trail recovery mechanisms
                  6.2.1     VC trail protection
                  6.2.2     VC trail restoration
                  6.2.3     VC trail recovery times
        6.3     VC trail restoration during maintenance activities
        6.4     VC trail restoration exercises
        6.5     High priority and pre-emptible VC trails
Appendix I - Bibliography
Appendix II - Manual restoration using Digital Cross-Connect Equipment