Rec. ITU-T G.703 Amendment 1 (05/2021) Physical/Electrical Characteristics of Hierarchical Digital Interfaces
Summary
History
FOREWORD
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
          6.1.1 Three types of envisaged interfaces
               6.1.1.1 Codirectional interface
               6.1.1.2 Centralized clock interface
               6.1.1.3 Contradirectional interface
     6.2 Electrical characteristics
          6.2.1 Electrical characteristics of 64 kbit/s codirectional interface
               6.2.1.1 General characteristics
               6.2.1.2 Specifications at the output ports
               6.2.1.3 Specifications at the input ports
               6.2.1.4 Grounding of screen
          6.2.2 Electrical characteristics of the 64 kbit/s centralized clock interface
               6.2.2.1 General characteristics
               6.2.2.2 Characteristics at the output ports
               6.2.2.3 Characteristics at the input ports
               6.2.2.4 Cable characteristics
          6.2.3 Electrical characteristics of 64 kbit/s contradirectional interface
               6.2.3.1 General characteristics
               6.2.3.2 Specifications at the output ports
               6.2.3.3 Specifications at the input ports
               6.2.3.4 Grounding of screen
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
          19.1.1 1PPS rise and fall time specification
          19.1.2 Signal timing
     19.2 1PPS 50 ( phase-synchronization measurement interface
          19.2.1 Performance specification
          19.2.2 Voltage levels
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
Annex B  High accuracy one pulse-per-second (1PPS) requirements
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
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