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ITU-T G.703
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SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments – General
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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T
G.703
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
(11/2001)
SERIES G: TRANSMISSION SYSTEMS AND MEDIA,
DIGITAL SYSTEMS AND NETWORKS
Digital terminal equipments – General
Physical/electrical characteristics of
hierarchical digital interfaces
ITU-T Recommendation G.703
ITU-T G-SERIES RECOMMENDATIONS
TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS
INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100–G.199
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 G.500–G.599
TRANSMISSION MEDIA CHARACTERISTICS G.600–G.699
DIGITAL 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
DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900–G.999
QUALITY OF SERVICE AND PERFORMANCE G.1000–G.1999
TRANSMISSION MEDIA CHARACTERISTICS G.6000–G.6999
DIGITAL TERMINAL EQUIPMENTS G.7000–G.7999
DIGITAL NETWORKS G.8000–G.8999
For further details, please refer to the list of ITU-T Recommendations.
ITU-T Rec. G.703 (11/2001) i
ITU-T Recommendation G.703
Physical/electrical characteristics of hierarchical digital interfaces
Summary
This Recommendation specifies the recommended physical and electrical characteristics of the
interfaces at hierarchical bit rates as described in ITU-T Recs. G.702 (PDH) and G.707 (SDH). The
interfaces are defined in terms of general characteristics, specifications at the output ports and input
ports and/or cross-connect points, earthing of outer conductor or screen and coding rules.
Source
ITU-T Recommendation G.703 was prepared by ITU-T Study Group 15 (2001-2004) and approved
under the WTSA Resolution 1 procedure on 29 November 2001.
History
Issue Notes
10/2001 This revision contains the following modifications:
– Addition of clause 16 on 51 840 kbit/s (STM-0) interface.
– Addition of Appendix III on 3152 kbit/s interface (from G.931/Annex A).
– Amendments to clause 13 on 2048 kbit/s synchronization interface.
– Amendments of clauses 4, 9, 10, 11 with the inclusion of output return loss requirements for
the 64 kbit/s (codirectional), 2048, 8448, 34 368 kbit/s interfaces.
– Insertion of names of hierarchical interfaces (E0, E11, E21 etc.) into the headings of the
corresponding clauses.
– Giving of references to ITU-T Rec. G.824 (2000) with jitter parameters for the 1544 kbit/s
hierarchy.
Some editorial corrections were made including changes of references to the last versions of
G.823, G.825 (2000).
10/98 This revision includes a correction to the specification of the 1544 and 44 736 kbit/s interfaces
and the addition of Appendix I. Appendix I contains a previous version of the 1544 kbit/s
interface specification.
The overvoltage protection requirements have been deleted and replaced with a reference to
Recommendation K.41 "Resistibility of internal interfaces of telecommunication centres to surge
overvoltages".
The grounding requirements for the screen (if existing) of a symmetrical pair, or the outer
conductor of a coaxial cable have been enhanced.
Editorial modifications are included to comply with Recommendation A.3. Clauses 1 to 12 in the
1991 revision are as a consequence renumbered into clauses 4 to 15.
Appendix II on 64 and 6312 synchronization interfaces for use in Japan has been added.
1991 Previous revision
1972 Initial version
ii ITU-T Rec. G.703 (11/2001)
FOREWORD
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of
ITU. 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 Assembly (WTSA), which meets every four years,
establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on
these topics.
The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 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 expression "Administration" is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
INTELLECTUAL PROPERTY RIGHTS
ITU draws attention to the possibility that the practice or implementation of this Recommendation may
involve the use of a claimed Intellectual Property Right. 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, 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 2002
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the
prior written permission of ITU.
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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