ITU-T Rec. G.703 (11/2001) iii
CONTENTS
Page
1 Scope ............................................................................................................................ 1
2 References..................................................................................................................... 1
3 Abbreviations................................................................................................................ 2
4 Interface at 64 kbit/s (E0) ............................................................................................. 3
4.1 Functional requirements ................................................................................. 3
4.1.1 Three types of envisaged interfaces ............................................................... 3
4.2 Electrical characteristics................................................................................. 5
4.2.1 Electrical characteristics of 64 kbit/s codirectional interface......................... 5
4.2.2 Electrical characteristics of the 64 kbit/s centralized clock interface............. 8
4.2.3 Electrical characteristics of 64 kbit/s contradirectional interface................... 10
5 Interface at 1544 kbit/s (E11) ....................................................................................... 13
5.1 General characteristics.................................................................................... 13
5.2 Pulse specification .......................................................................................... 16
5.3 Eye diagrams .................................................................................................. 16
6 Interface at 6312 kbit/s (E21) ....................................................................................... 16
7 Interface at 32 064 kbit/s .............................................................................................. 19
8 Interface at 44 736 kbit/s (E32) .................................................................................... 21
9 Interface at 2048 kbit/s (E12) ....................................................................................... 23
9.1 General characteristics.................................................................................... 23
9.2 Specifications at the output ports ................................................................... 24
9.3 Specifications at the input ports ..................................................................... 25
9.4 Grounding of outer conductor or screen......................................................... 26
10 Interface at 8448 kbit/s (E22) ....................................................................................... 26
10.1 General characteristics.................................................................................... 26
10.2 Specification at the output ports ..................................................................... 26
10.3 Specifications at the input ports ..................................................................... 28
10.4 Grounding of outer conductor ........................................................................ 28
11 Interface at 34 368 kbit/s (E31) .................................................................................... 28
11.1 General characteristics.................................................................................... 28
11.2 Specification at the output ports ..................................................................... 28
11.3 Specifications at the input ports ..................................................................... 30
11.4 Grounding of outer conductor ........................................................................ 30
12 Interface at 139 264 kbit/s (E4) .................................................................................... 30
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2009-07-29
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爱爱爱1123222013-02-12确实是ITU-T G.703正式规范
