ITU-T-G.703标准_ITU-TG.703标准

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INTERNATIONAL TELECOMMUNICATION UNION

ITU-T

G.703

TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

(10/98)

SERIES G: TRANSMISSION SYSTEMS AND MEDIA,

DIGITAL SYSTEMS AND NETWORKS

Digital transmission systems – Terminal equipments –

General

Physical/electrical characteristics of hierarchical

digital interfaces

ITU-T Recommendation G.703

(Previously CCITT Recommendation)

ITU-T G-SERIES RECOMMENDATIONS

TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS

For further details, please refer to ITU-T List of Recommendations.

INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100–G.199

INTERNATIONAL ANALOGUE CARRIER SYSTEM

GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-

TRANSMISSION SYSTEMS

G.200–G.299

INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE

SYSTEMS ON METALLIC LINES

G.300–G.399

GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE

SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION

WITH METALLIC LINES

G.400–G.449

COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450–G.499

TESTING EQUIPMENTS

TRANSMISSION MEDIA CHARACTERISTICS

DIGITAL TRANSMISSION SYSTEMS

TERMINAL EQUIPMENTS G.700–G.799

General G.700–G.709

Coding of analogue signals by pulse code modulation G.710–G.719

Coding of analogue signals by methods other than PCM G.720–G.729

Principal characteristics of primary multiplex equipment G.730–G.739

Principal characteristics of second order multiplex equipment G.740–G.749

Principal characteristics of higher order multiplex equipment G.750–G.759

Principal characteristics of transcoder and digital multiplication equipment G.760–G.769

Operations, administration and maintenance features of transmission equipment G.770–G.779

Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.780–G.789

Other terminal equipment G.790–G.799

DIGITAL NETWORKS G.800–G.899

General aspects G.800–G.809

Design objectives for digital networks G.810–G.819

Quality and availability targets G.820–G.829

Network capabilities and functions G.830–G.839

SDH network characteristics G.840–G.849

Telecommunications management network G.850–G.859

DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900–G.999

General G.900–G.909

Parameters for optical fibre cable systems G.910–G.919

Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920–G.929

Digital line transmission systems on cable at non-hierarchical bit rates G.930–G.939

Digital line systems provided by FDM transmission bearers G.940–G.949

Digital line systems G.950–G.959

Digital section and digital transmission systems for customer access to ISDN G.960–G.969

Optical fibre submarine cable systems G.970–G.979

Optical line systems for local and access networks G.980–G.989

Access networks G.990–G.999

Recommendation G.703 (10/98)

FOREWORD

ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of

telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of

the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing

Recommendations on them with a view to standardizing telecommunications on a worldwide basis.

The World Telecommunication Standardization Conference (WTSC), which meets every four years,

establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations

on these topics.

The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in

WTSC Resolution No. 1.

In some areas of information technology which fall within ITU-T’s purview, the necessary standards are

prepared on a collaborative basis with ISO and IEC.

NOTE

In this Recommendation the term recognized operating agency (ROA) includes any individual, company,

corporation or governmental organization that operates a public correspondence service. The terms

Administration, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992).

INTELLECTUAL PROPERTY RIGHTS

The ITU draws attention to the possibility that the practice or implementation of this Recommendation may

involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence,

validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others

outside of the Recommendation development process.

As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property,

protected by patents, which may be required to implement this Recommendation. However, implementors are

cautioned that this may not represent the latest information and are therefore strongly urged to consult the

TSB patent database.

 ITU 1999

electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU.

Recommendation G.703 (10/98) iii

CONTENTS

Page

1 Scope..........................................................................................................................1

2 References.................................................................................................................. 1

3 Abbreviations ............................................................................................................. 2

4 Interface at 64 kbit/s................................................................................................... 2

4.1 Functional requirements............................................................................................. 2

4.1.1 Three types of envisaged interfaces.............................................................. 3

4.2 Electrical characteristics............................................................................................. 4

4.2.1 Electrical characteristics of 64 kbit/s codirectional interface........................ 4

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............................................................................................... 13

5.1 General characteristics................................................................................................ 13

5.2 Pulse specification...................................................................................................... 16

5.3 Eye diagrams.............................................................................................................. 16

6 Interface at 6312 kbit/s............................................................................................... 16

7 Interface at 32 064 kbit/s............................................................................................ 19

8 Interface at 44 736 kbit/s............................................................................................ 21

9 Interface at 2048 kbit/s............................................................................................... 24

9.1 General characteristics................................................................................................ 24

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............................................................................................... 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............................................................................................ 28

11.1 General characteristics................................................................................................ 28

11.2 Specification at the output ports................................................................................. 28

11.3 Specifications at the input ports ................................................................................. 29

11.4 Grounding of outer conductor.................................................................................... 30

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