1、 International Telecommunication Union ITU-T G.803TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(06/2005) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital networks General aspects Architecture of transport networks based on the synchronous digital hierarchy
2、 (SDH) Amendment 1 ITU-T Recommendation G.803 (2000) Amendment 1 ITU-T G-SERIES 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.
3、299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON 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 TELEP
4、HONY G.450G.499 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 General aspects G.800G.809 Design objectives for digital networks G.810G.819 Quality and availability targets G.820G.829 Network capabilities and functions G.830G.839 SDH
5、network characteristics G.840G.849 Management of transport network G.850G.859 SDH radio and satellite systems integration G.860G.869 Optical transport networks G.870G.879 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1
6、999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.803 (2000)/Amd.1 (06/2005) i ITU-T Recom
7、mendation G.803 Architecture of transport networks based on the synchronous digital hierarchy (SDH) Amendment 1 Summary This amendment replaces some definitions with a reference to ITU-T Rec. G.780/Y.1351 and the modifications contained in Study Group 15 Report COM 15-R 5 Annex C. Source Amendment 1
8、 to ITU-T Recommendation G.803 (2000) was approved on 29 June 2005 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.803 (2000)/Amd.1 (06/2005) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the fie
9、ld 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 Wo
10、rld 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. I
11、n some areas of information technology which fall within ITU-Ts 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 reco
12、gnized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The wo
13、rds “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility tha
14、t 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 Recommendat
15、ion 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 a
16、re therefore strongly urged to consult the TSB patent database. ITU 2005 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.803 (2000)/Amd.1 (06/2005) iii CONTENTS Page 1) Clause 2 References 1 2) Cla
17、use 3 Terms and definitions 1 3) Clause 6.3 Sublayer monitoring . 2 ITU-T Rec. G.803 (2000)/Amd.1 (06/2005) 1 ITU-T Recommendation G.803 Architecture of transport networks based on the synchronous digital hierarchy (SDH) Amendment 1 1) Clause 2 References Add the following new reference alphanumeric
18、ally: ITU-T Recommendation G.808.1 (2003), Generic protection switching Linear trail and subnetwork protection. 2) Clause 3 Terms and definitions Replace the original terms and definitions with the new text as follows and remove footnotes: Original term Replacement text 3.1 SDH higher-order path lay
19、er networks: Those layer networks with characteristic information of VC-31, VC-3-Xv (X = 2 48)2, VC-4, VC-4-Xc (X = 4, 16)3or VC-4-Xv (X = 2 16)3. 3.1 SDH higher-order path layer networks: See ITU-T Rec. G.780/Y.1351. 3.2 SDH lower-order path layer networks: Those layer networks with characteristic
20、information of VC-11, VC-11-Xv (X = 2 84), VC-12, VC-12-Xv (X = 2 63), VC-2, VC-2-Xc (X = 2 7)4, VC-2-Xv (X = 2 21)5or VC-31or VC-3-Xv (X = 2 3)5. 3.2 SDH lower-order path layer networks: See ITU-T Rec. G.780/Y.1351. 3.3 SDH path layer: A transport assembly composed of the SDH higher-order path laye
21、r network and lower-order path layer network together with the associated adaptation functions. 3.3 SDH path layer: See ITU-T Rec. G.780/Y.1351. 3.4 SDH section layer: A transport assembly composed of the SDH multiplex section layer network and regenerator section layer network together with the ass
22、ociated adaptation functions. 3.4 SDH section layer: See ITU-T Rec. G.780/Y.1351. 3.5 SDH multiplex section layer: A layer network with characteristic information of STM-N, i.e., with a bit rate of STM-N and the multiplex section overhead as defined in ITU-T Rec. G.707. 3.5 SDH multiplex section lay
23、er: See ITU-T Rec. G.780/Y.1351. 2 ITU-T Rec. G.803 (2000)/Amd.1 (06/2005) Original term Replacement text 3.6 SDH regenerator section layer: A layer network with characteristic information of STM-N, i.e., with a bit rate of STM-N and the regenerator section overhead as defined in ITU-T Rec. G.707. 3
24、.6 SDH regenerator section layer: See ITU-T Rec. G.780/Y.1351. Footnotes: 1 The VC-3 is considered to be a higher-order path if it is supported directly by an AU-3 in a multiplex section layer network; it is considered a lower-order path if it is supported by a TU-3 in a VC-4 layer network. 2 Values
25、 of X larger than 48 may be required. 3 Values of X larger than 16 may be required. 4 Transported in one higher order VC-3 5 Transported in one higher order VC-4. 3) Clause 6.3 Sublayer monitoring After Figure 6-1 insert the following text and figures: Note that SDH supports only one level of TCM pe
26、r VC-n path level. Nesting and overlapping of TCM as shown in Figure 6-1a is, therefore, not supported. Figure 6-1a/G.803 Not supported SDH tandem connection monitoring (nesting, overlapping) Together with VC-n subnetwork protection SNC (see 11.2/G.808.1) TCM can be used to provide the protection sw
27、itching criteria by monitoring the working and protection subnetwork connection between the protection switching points (SNC/S as defined in 11.2/G.808.1) or for monitoring of the protected signal as shown in Figure 6-1b. ITU-T Rec. G.803 (2000)/Amd.1 (06/2005) 3 NENE NENEG.803AMD.1_F6-1bNESNC/SNENE
28、 NENENENENE NENENENESNC/I or SNC/NVC-n TC protectedVC-n TC protectionVC-n TC workingprotectionswitchingnodeVC-n TCSNC/I or SNC/Nprotectionswitchingnodeprotectionswitchingnodeprotectionswitchingnodeprotectionswitchingnodemonitoring ofprotected connectionworking connectionprotection connectionmonitori
29、ng ofworking and protection connection (SNC/S)working connectionprotection connectionoverlapping of TCM and protectionnot allowedworking connectionprotection connectionprotectionswitchingnodeFigure 6-1b/G.803 SDH tandem connection monitoring SNC protection Note that TCM for the working and protectio
30、n connection and the protected connection at the same time is not possible as nesting of TCM is not supported. Overlapping of TCM and subnetwork connection protection is not allowed as the relation between TCM source and sink functions will change with every protection switch. Printed in Switzerland
31、 Geneva, 2005 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and m
32、edia, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installatio
33、n and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone trans
34、mission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
