1、Union internationale des tlcommunications Place des Nations 1211 GENEVE 20 Suisse Switzerland Suiza COVERING NOTE GENERAL SECRETARIAT OF THE INTERNATIONAL TELECOMMUNICATION UNION Geneva, 20 July 2005 ITU TELECOMMUNICATION STANDARDIZATION SECTOR Subject: Erratum 1 (07/2005) to ITU-T Recommendation G.
2、703 (11/2001), Physical/electrical characteristics of hierarchical digital interfaces 1) In Figure 22/G.703 “Mask of a pulse corresponding to a binary 0 (at the 155 520 kbit/s interface)“, mask values were incorrect (pulse period of 19.3 ns instead of 6.43 ns). Replace the whole figure by the follow
3、ing: 2 2) In Figure 26/G.703 “Mask of a pulse corresponding to a binary 0 (at the 51 840 kbit/s interface)“, correct Note 4 as follows: NOTE 4 For the purpose of these masks, the rise time and decay time should be measured between 0.4 V and 0.4 V, and should not exceed 26 ns. INTERNATIONAL TELECOMMU
4、NICATION UNION ITU-T G.703TELECOMMUNICATION 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-SER
5、IES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON
6、 METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERIS
7、TICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 General G.700G.709 Coding of analogue signals by pulse code modulation G.710G.719 Coding of analogue signals by methods other than PCM G.720G.729 Principal characteristics of primary multiplex equipment G.730G.739 Principal characteristics of se
8、cond order multiplex equipment G.740G.749 Principal characteristics of higher order multiplex equipment G.750G.759 Principal characteristics of transcoder and digital multiplication equipment G.760G.769 Operations, administration and maintenance features of transmission equipment G.770G.779 Principa
9、l characteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.
10、6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.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 Recommendati
11、on 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-co
12、nnect 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 modificati
13、ons: 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
14、 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 correc
15、tions 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 spe
16、cification. 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
17、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 ad
18、ded. 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. I
19、TU-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 s
20、tudy 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-Ts purview, the necessary standards are prepared on
21、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
22、 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 p
23、rocess. 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 stro
24、ngly 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
25、 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
26、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
27、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. 2
28、6 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 26
29、4 kbit/s (E4) 30 iv ITU-T Rec. G.703 (11/2001) Page 12.1 General characteristics 30 12.2 Specifications at the output ports . 31 12.3 Specifications at the input ports . 34 12.4 Grounding of outer conductor 34 13 2048 kHz synchronization interface (T12). 34 13.1 General characteristics 34 13.2 Speci
30、fications at the output ports . 34 13.3 Specifications at the input ports . 35 13.4 Grounding of outer conductor or screen. 36 14 Interface at 97 728 kbit/s 36 15 Interface at 155 520 kbit/s STM-1 interface (ES1) . 37 15.1 General characteristics 37 15.2 Specifications at the output ports . 37 15.3
31、Specifications at the input ports . 38 15.4 Specifications at the cross-connect points 38 15.5 Grounding of outer conductor 41 16 Interface at 51 840 kbit/s (STM-0 interface) 41 16.1 General characteristics 41 16.2 Specifications at the output ports . 42 16.3 Specifications at the input ports . 46 1
32、6.4 Specifications at the cross-connect points 47 16.5 Grounding of outer conductor 48 Annex A Definition of codes 48 A.1 Definition of B3ZS (also designated HDB2) and HDB3 . 48 A.2 Definition of B6ZS and B8ZS 48 A.3 Definition of CMI. 48 Appendix I 1544 kbit/s specification in the 1991 version of t
33、his Recommendation 49 I.1 General . 49 I.2 Interface specification 49 I.3 Pulse mask 49 Appendix II 64 and 6312 kHz synchronization interface specification for use in Japan 51 II.1 64 kHz synchronization interface. 51 II.2 6312 kHz synchronization interface. 52 Appendix III 3152 kbit/s interface spe
34、cification for use in North America . 53 ITU-T Rec. G.703 (11/2001) 1 ITU-T Recommendation G.703 Physical/electrical characteristics of hierarchical digital interfaces 1 Scope This Recommendation provides the recommended physical and electrical characteristics of the interfaces at hierarchical bit r
35、ates as described in ITU-T Recs. G.702 (PDH) and G.707 (SDH), to enable the interconnection of digital network components (digital sections, multiplex equipment, exchanges) to form an international digital link or connection. The characteristics given in this Recommendation should be applied to new
36、equipment (component) designs. NOTE 1 The characteristics of interfaces at non-hierarchical bit rates, except n 64 kbit/s interfaces conveyed by 1544 kbit/s or 2048 kbit/s interfaces and 3152 kbit/s interface in North American hierarchy, are specified in the respective equipment Recommendations. NOT
37、E 2 The jitter specifications contained in this Recommendation are intended to be imposed at international interconnection points. NOTE 3 The interfaces described in clauses 5 to 12 correspond to the ports T (output port) and T (input port) as recommended for interconnection in ITU-R Rec. F.596-1 (I
38、nterconnection of digital radio-relay systems). NOTE 4 For signals with bit rates of n 64 kbit/s (n = 2 to 31) which are routed through multiplexing equipment specified for the 2048 kbit/s hierarchy, the interface shall have the same physical/electrical characteristics as those for the 2048 kbit/s i
39、nterface specified in clause 9. For signals with bit rates of n 64 kbit/s (n = 2 to 23) which are routed through multiplexing equipment specified for the 1544 kbit/s hierarchy, the interface shall have the same physical/electrical characteristics as those for the 1544 kbit/s interface specified in c
40、lause 5. NOTE 5 The specifications contained in this Recommendation are related to the physical interface only (i.e. to characterize the line codes and input/output equipment interfaces); in particular, the required frequency tolerances do not imply overall equipment performances which may be driven
41、 by tighter requirements in Recommendations for specific network/equipment applications (e.g. ITU-T Recs. G.813 and G.783). 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At
42、 the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references list
43、ed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation G.701 (1993), Vocabulary of digital transmission and multiplexing, and pulse code modulation (PCM) terms. ITU-T Recommendation G.702 (1988), Digital hierarchy bit rates. ITU-T Recommendation G.
44、704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels. ITU-T Recommendation G.707/Y.1322 (2000), Network node interface for the synchronous digital hierarchy (SDH). ITU-T Recommendation G.742 (1988), Second order digital multiplex equipment ope
45、rating at 8448 kbit/s and using positive justification. 2 ITU-T Rec. G.703 (11/2001) ITU-T Recommendation G.747 (1988), Second order digital multiplex equipment operating at 6312 kbit/s and multiplexing three tributaries at 2048 kbit/s. ITU-T Recommendation G.751 (1988), Digital multiplex equipments
46、 operating at the third order bit rate of 34 368 kbit/s and the fourth order bit rate of 139 264 kbit/s and using positive justification. ITU-T Recommendation G.752 (1988), Characteristics of digital multiplex equipment based on a second order bit rate of 6312 kbit/s and using positive justification
47、. ITU-T Recommendation G.753 (1988), Third order digital multiplex equipment operating at 34 368 kbit/s and using positive/zero/ negative justification. ITU-T Recommendation G.755 (1988), Digital multiplex equipment operating at 139 264 kbit/s and multiplexing three tributaries at 44 736 kbit/s. ITU
48、-T Recommendation G.811 (1997), Timing characteristics of primary reference clocks. ITU-T Recommendation G.812 (1998), Timing requirements of slave clocks suitable for use as node clocks in synchronization networks. ITU-T Recommendation G.813 (1996), Timing characteristics of SDH equipment slave clo
49、cks (SEC). ITU-T Recommendation G.823 (2000), The control of jitter and wander within digital networks which are based on the 2048 kbit/s hierarchy. ITU-T Recommendation G.824 (2000), The control of jitter and wander within digital networks which are based on the 1544 kbit/s hierarchy. ITU-T Recommendation G.825 (2000), The control of jitter and wander within digital networks which are based on the synchronous digital hierarchy (SDH). ITU-T Recommendation K.27 (1996), Bonding c
