1、 International Telecommunication Union ITU-T G.8031/Y.1342TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(08/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Packet over Transport aspects Ethernet over Transport aspects SERIES Y: GLOBAL INFORMATION INFRASTRUCT
2、URE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Ethernet linear protection switching Amendment 1 Clarifications to APS format Recommendation ITU-T G.8031/Y.1342 (2011) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL S
3、YSTEMS 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 GENERAL CHARACTERISTICS OF INTERNA
4、TIONAL 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 EQUIPMENTS G.700G.799 DIGITAL NETWORKS
5、 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 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 Ethe
6、rnet over Transport aspects G.8000G.8099MPLS over Transport aspects G.8100G.8199 Quality and availability targets G.8200G.8299 Service Management G.8600G.8699 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.8031/Y.1342 (2011)/Amd.1 (0
7、8/2013) i Recommendation ITU-T G.8031/Y.1342 Ethernet linear protection switching Amendment 1 Clarifications to APS format Summary Amendment 1 to Recommendation ITU-T G.8031/Y.1342 (2011) clarifies clause 11.1 (APS format). History Edition Recommendation Approval Study Group 1.0 ITU-T G.8031/Y.1342
8、2006-06-06 15 1.1 ITU-T G.8031/Y.1342 (2006) Amd. 1 2007-10-07 15 1.2 ITU-T G.8031/Y.1342 (2006) Cor. 1 2008-06-06 15 2.0 ITU-T G.8031/Y.1342 2009-11-13 15 2.1 ITU-T G.8031/Y.1342 (2009) Cor. 1 2010-09-06 15 3.0 ITU-T G.8031/Y.1342 2011-06-22 15 3.1 ITU-T G.8031/Y.1342 (2011) Cor. 1 2012-02-13 15 3.
9、2 ITU-T G.8031/Y.1342 (2011) Amd.1 2013-08-29 15 ii Rec. ITU-T G.8031/Y.1342 (2011)/Amd.1 (08/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecom
10、munication 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 Ass
11、embly (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 wh
12、ich 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. Compliance with
13、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 obligatory la
14、nguage 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 implementation of thi
15、s 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
16、 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 consult the
17、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.8031/Y.1342 (2011)/Amd.1 (08/2013) 1 Recommendation ITU-T G.8031/Y.1342 Ethernet linear
18、 protection switching Amendment 1 Clarifications to APS format 1) Scope This amendment clarifies clause 11.1 (APS format). 2) Text modifications to Recommendation ITU-T G.8031/Y.1342 The following clauses contain modifications to be made to ITU-T G.8031/Y.1342. 2.1) Modifications to clause 11.1, APS
19、 format Change the first paragraph of clause 11.1 as follows: APS information is carried within the APS PDU which is one of a suite of Ethernet OAM PDUsmessages. OAM PDU formats for each type of Ethernet OAM operation are defined in ITU-T Y.1731. APS-specific information is transmitted by a MEP with
20、in specific fields in the APS PDU. The APS messages use the Multicast Class 1 DA. The APS PDU is identified by a specific Ethernet OAM OpCode. In this version of the Recommendation, 4 octets in the APS PDU are used to carry APS-specific information. This is illustrated in Figure 11-1. In addition, i
21、t should be noted that for the current version of this Recommendation, the TLV Offset field is required to be set to 0x04. Change the second paragraph of clause 11.1 as follows: The Version field shall be set to 0x00. For other fields such as Version, OpCode, Flags and END TLV, the following values
22、shall be used as defined in ITU-T Y.1731. a) Version: 0x00 ba) OpCode: 0d39 (=0x27) cb) Flags: 0x00 dc) END TLV: 0x00 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services
23、, 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 Services
24、 and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Chargi
25、ng 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 and
26、 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 NETWOR
27、KS 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, t
28、elephone 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 transmiss
29、ion 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:
30、 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 Serie
31、s 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
