CONTENTS

 1     Scope 
 2     References
 3     Terms and definitions   
 4     Abbreviations 
 5     Hypothetical reference model   
 6     Allocation principles for end-to-end VC connections  
 7     Performance objectives 
 8     Evaluation of error performance events
        8.1     Evaluation of ES/BBE/SES events from in-service measurements        
        8.2     Out-of-Service (OOS) measurements    
 9     Performance limits – general considerations    
        9.1     Relationship between performance limits and objectives
        9.2     Types of limits   
10     Performance limits for bringing-into-service   
       10.1     Calculation of path performance objectives and limits  
       10.2     BIS limit values for paths        
       10.3     Calculation of multiplex sections performance objectives and limits    
       10.4     BIS limit values for multiplex sections  
11     Performance limits for maintenance    
       11.1     Performance levels and limits    
       11.2     Performance limit thresholds    
12     Long-term quality monitoring/measurement   
13     Effects of timing impairments on error performance   
14     Availability and unavailability 
       14.1     Criteria for entry/exit to/from the unavailable state      
       14.2     Consequences for error performance measurements     
       14.3     Inhibiting performance monitoring during unavailable time      
       14.4     Unavailability limits     
Annex A – Example applications of path allocation from Table 2a    
Annex B – In-service ES, BBE and SES event evaluation criteria    
Annex C –Values for bringing-into-service limits for international digital paths and multiplex sections, based on ITU-T Rec. G.826    
Annex D –Values for bringing-into-service limits for international digital paths and multiplex sections, based on ITU-T Rec. G.828    
Annex E – Default unacceptable performance level threshold values