1、 International Telecommunication Union ITU-T G.7712/Y.1703TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(10/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Data over Transport Generic aspects Transport network control aspects SERIES Y: GLOBAL INFORMATION INF
2、RASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Operation, administration and maintenance Architecture and specification of data communication network Amendment 1 Recommendation ITU-T G.7712/Y.1703 (2010) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSM
3、ISSION 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 METALLIC LINES G.300G.399
4、 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 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQU
5、IPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 General G.70
6、00G.7099 Transport network control aspects G.7700G.7799PACKET OVER TRANSPORT ASPECTS G.8000G.89ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.7712/Y.1703 (2010)/Amd.1 (10/2013) i Recommendation ITU-T G.7712/Y.1703 Architecture and sp
7、ecification of data communication network Amendment 1 Summary Amendment 1 to Recommendation ITU-T G.7712/Y.1703 (2010) contains the specification and requirements for using the data communication network (DCN) for optical channel (OCh) overhead communication. A DCN that is used for overhead communic
8、ation is referred to as the overhead communications network (OCN). The OCN provides one or more point-to-point channels for the communication of the overhead. These channels are referred to as the overhead communications channel (OCC). History Edition Recommendation Approval Study Group 1.0 ITU-T G.
9、7712/Y.1703 2001-11-29 15 2.0 ITU-T G.7712/Y.1703 2003-03-16 15 3.0 ITU-T G.7712/Y.1703 2008-06-22 15 4.0 ITU-T G.7712/Y.1703 2010-09-06 15 4.1 ITU-T G.7712/Y.1703 (2010) Amd. 1 2013-10-07 15 Keywords Data communication network (DCN), Internet protocol (IP), optical channel (OCh), overhead communica
10、tions channel (OCC), overhead communications network (OCN). ii Rec. ITU-T G.7712/Y.1703 (2010)/Amd.1 (10/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The
11、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 Standard
12、ization 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 te
13、chnology 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 recognized operating agency. Compl
14、iance 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 words “shall“ or some other ob
15、ligatory 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 that the practice or implementa
16、tion 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
17、of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to c
18、onsult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.7712/Y.1703 (2010)/Amd.1 (10/2013) iii Table of Contents Page 1) Scope 1 2)
19、Updates to ITU-T G.7712 . 1 2.1) Clause 2, References 1 2.2) Clause 3.2, Terms defined in this Recommendation 1 2.3) Clause 4, Abbreviations and acronyms 1 2.4) Clause 6.3 . 2 Rec. ITU-T G.7712/Y.1703 (2010)/Amd.1 (10/2013) 1 Recommendation ITU-T G.7712/Y.1703 Architecture and specification of data
20、communication network 1) Scope This amendment contains the specification and requirements for using the data communication network (DCN) for OCh overhead communication when the optical supervisory channel (OSC) is not available. 2) Updates to ITU-T G.7712 2.1) Clause 2, References Add the following
21、new references in clause 2: ITU-T G.698.1 Recommendation ITU-T G.698.1 (2009), Multichannel DWDM applications with single-channel optical interfaces. ITU-T G.698.2 Recommendation ITU-T G.698.2 (2009), Amplified multichannel dense wavelength division multiplexing applications with single channel opti
22、cal interfaces. ITU-T G.872 Recommendation ITU-T G.872 (2012), Architecture of optical transport networks; plus Amendment 1 (2013). 2.2) Clause 3.2, Terms defined in this Recommendation Re-number the existing clause 3.2.8 on SCC as 3.2.10 and add the following two new definitions as 3.2.8 and 3.2.9:
23、 3.2.8 overhead communications channel (OCC): The overhead communications network (OCN) provides one or more channels for the communication of the overhead. These channels are referred to as the overhead communications channel (OCC). 3.2.9 overhead communications network (OCN): A data communication
24、network (DCN) that is used for overhead communication is referred to as the overhead communications network (OCN). 2.3) Clause 4, Abbreviations and acronyms Add the following new abbreviations in clause 4: AP Access Point NC Network Connection NIM Non-Intrusive Monitoring OCC Overhead Communications
25、 Channel OCh Optical Channel OCh-O OCh Overhead OCh-P OCh Payload OCN Overhead Communications Network TCP Termination Connection Point 2 Rec. ITU-T G.7712/Y.1703 (2010)/Amd.1 (10/2013) 2.4) Clause 6.3 6.3 Other applications requiring communication networks Besides TMN and ASON applications, other ap
26、plications such as overhead communication (e.g., OCh overhead), voice communications (e.g., orderwire), software downloads and operator specific communications require a communication network to provide transport of information between components. A DCN that is used for overhead communication is ref
27、erred to as the overhead communications network (OCN). The OCN provides one or more channels for the communication of the overhead. These channels are referred to as the overhead communications channel (OCC). Described below is an application of the OCN for OCh layer overhead communication. 6.3.1 OC
28、h overhead communication application The OCh layer network uses non-associated overhead (OCh-O), which is normally transported in the OTM-n.m via the OTM overhead signal (OOS) carried in the optical supervisory channel (OSC). For the case where an OCh signal is transported in a single channel intra-
29、domain interface as described in ITU-T G.698.1 and ITU-T G.698.2, the OSC may not be available. To transport this OCh-O across the interface between the OCh subnetwork and the OCh source/sink, an overhead communications channel (OCC) within the overhead communications network (OCN) is used as shown
30、in Figure 6-17. The OCh-O messages must be carried in a PDU that is encapsulated into the OCN packet/frame format for the technology used in the OCN. The OCh-O PDU must contain sufficient information so that the source, sink and intermediate points can verify the connectivity. In this application, t
31、he OCN provides point-to-point connectivity between two OCh-O connection points (OCh-O CP) to transport the OCh-O associated with the OCh payload (OCh-P) (see Figure 6-17). The OCN should be able to support one or more of these point-to-point connections simultaneously. An OCN should be designed to
32、ensure that a single fault does not prevent the transfer of the OCh-O messages. The OCN should be designed to ensure that the messages are delivered correctly and does not impose blocking or excessive delay. NOTE The specification for how the primitive and information elements described in Amendment
33、 2 of ITU-T G.709 are carried across an OCN is for further study. Rec. ITU-T G.7712/Y.1703 (2010)/Amd.1 (10/2013) 3 G.7712-Y.1703(10)-Amd.1(13)_F6-17OCh AP OCh AP OCh-P CP OCh-P CP OCh-P LC OCh-P LC OCh Trail OCh-P network connection OCh-P OCh-PNetwork media channelChannel port Channel portOCh-O APO
34、Ch-O CP OCh-O CPOCh-PNIMOCh-PNIMMI MIOCh-O OCh-OOCh subnetworkOCCOCNOCh-O NCOCNOCh-OOCh-Ocarried by OSCSSRROCCOCh-OOCh-OMatrix channel Link channelMedia channel matrixMatrix channelMedia channel matrixLink channel Matrix channelMedia channel matrixOCh-Ocarried by OSCOCh-O TrailOCh-O APOCh-O TCPFigur
35、e 6-17 OCh overhead transport for the case of single channel IaDI (based on Figure 12-1 of Amendment 1 of ITU-T G.872) ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Service
36、s, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Service
37、s and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799Charg
38、ing Y.1800Y.1899 IPTV over NGN Y.1900Y.1999 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services an
39、d networks in NGN Y.2250Y.2299 Enhancements to NGN Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 FUTURE NETWO
40、RKS Y.3000Y.3499 CLOUD COMPUTING Y.3500Y.3999 For further details, please refer to the list of ITU-T Recommendations. Printed in Switzerland Geneva, 2013 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation,
41、telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmis
42、sion of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance
43、: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and objective assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Seri
44、es 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
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