Table of Contents

 1     Scope          
 2     References
 3     Definitions 
        3.1     Terms defined elsewhere        
        3.2     Terms defined in this Recommendation            
 4     Abbreviations and acronyms             
 5     Conventions             
 6     Interface at 64 kbit/s (E0)    
        6.1     Functional requirements          
        6.2     Electrical characteristics             
 7     Interface at 1544 kbit/s (E11)             
        7.1     General characteristics              
        7.2     Pulse specification       
        7.3     Eye diagrams 
 8     Interface at 6312 kbit/s (E21)             
 9     Interface at 32 064 kbit/s     
10     Interface at 44 736 kbit/s (E32)        
11     Interface at 2048 kbit/s (E12)           
       11.1     General characteristics             
       11.2     Specifications at the output ports       
       11.3     Specifications at the input ports           
       11.4     Grounding of outer conductor or screen          
12     Interface at 8448 kbit/s (E22)           
       12.1     General characteristics             
       12.2     Specification at the output ports         
       12.3     Specifications at the input ports           
       12.4     Grounding of outer conductor              
13     Interface at 34 368 kbit/s (E31)        
       13.1     General characteristics             
       13.2     Specification at the output ports         
       13.3     Specifications at the input ports           
       13.4     Grounding of outer conductor              
14     Interface at 139 264 kbit/s (E4)        
       14.1     General characteristics             
       14.2     Specifications at the output ports       
       14.3     Specifications at the input ports           
       14.4     Grounding of outer conductor              
15     2048 kHz synchronization interface (T12)    
       15.1     General characteristics             
       15.2     Specifications at the output ports       
       15.3     Specifications at the input ports           
       15.4     Grounding of outer conductor or screen          
16     Interface at 97 728 kbit/s   
17     Interface at 155 520 kbit/s STM-1 interface (ES1)
       17.1     General characteristics             
       17.2     Specifications at the output ports       
       17.3     Specifications at the input ports           
       17.4     Specifications at the cross-connect points       
       17.5     Grounding of outer conductor              
18     Interface at 51 840 kbit/s (STM-0 interface)               
       18.1     General characteristics             
       18.2     Specifications at the output ports       
       18.3     Specifications at the input ports           
       18.4     Specifications at the cross-connect points       
       18.5     Grounding of outer conductor              
19     Time synchronization interfaces defined in ITU-T G.8271/Y.1366     
       19.1     ITU-T V.11-based time/phase distribution interface   
       19.2     1PPS 50 W phase-synchronization measurement interface      
20     10 MHz synchronization interface  
       20.1     General characteristics             
       20.2     Specifications at the output ports       
       20.3     Specifications at the input ports           
Annex A – Definition of codes    
        A.1     Definition of B3ZS (also designated HDB2) and HDB3   
        A.2     Definition of B6ZS and B8ZS    
        A.3     Definition of CMI         
Appendix I – 1544 kbit/s specification in the 1991 version of this Recommendation    
        I.1     General             
        I.2     Interface specification
        I.3     Pulse mask      
Appendix II – 64 and 6312 kHz synchronization interface specification for use in Japan    
       II.1     64 kHz synchronization interface           
       II.2     6312 kHz synchronization interface       
Appendix III – 3152 kbit/s interface specification for use in North America (From Annex A – [ITU-   T G.931)    
Bibliography