1、 International Telecommunication Union ITU-T G.7043/Y.1343TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(12/2006) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Data over Transport Generic aspects General SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PR
2、OTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Virtual concatenation of plesiochronous digital hierarchy (PDH) signals Corrigendum 1 ITU-T Recommendation G.7043/Y.1343 (2004) Corrigendum 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS
3、 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 INTERNATIONAL
4、 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 CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIO
5、NS AND DIGITAL LINE SYSTEM G.900G.999 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.7000G.7099 Transport network control aspects G.7700G.7799 PACKET OVER TRAN
6、SPORT ASPECTS G.8000G.8999ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.7043/Y.1343 (2004)/Cor.1 (12/2006) i ITU-T Recommendation G.7043/Y.1343 Virtual concatenation of plesiochronous digital hierarchy (PDH) signals Corrigendum 1 Su
7、mmary This corrigendum provides a correction to the differential delay calculation for 34 368 kbit/s signal and modifies the text in three areas where ambiguities have been identified that could potentially lead to interworking issues. These areas pertain to MST frame alignment, the definition of a
8、“container frame“, and the proper operation of MFI2 MSBs for 1544 and 2048 kbit/s signals. Source Corrigendum 1 to ITU-T Recommendation G.7043/Y.1343 (2004) was approved on 14 December 2006 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.7043/Y.1343
9、(2004)/Cor.1 (12/2006) 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 an
10、d 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 R
11、ecommendations 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 a collaborative basis with ISO and IEC. NOTE In this Rec
12、ommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoper
13、ability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “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 c
14、ompliance with the Recommendation is required of any party. 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, vali
15、dity 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 requ
16、ired to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduc
17、ed, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.7043/Y.1343 (2004)/Cor.1 (12/2006) iii CONTENTS Page 1) Clause 6.1.1 1 2) Clause 6.1.2.1 . 1 3) Clause 6.1.2.2 . 1 4) Clause 6.2.1 2 5) Clause 6.2.2.2 . 2 6) Clause 6.3.1 2 7) Clause 6.3.2.1 . 2 8) Clause 6.3.2.2
18、. 2 9) Clause 6.4.1 2 ITU-T Rec. G.7043/Y.1343 (2004)/Cor.1 (12/2006) 1 ITU-T Recommendation G.7043/Y.1343 Virtual concatenation of plesiochronous digital hierarchy (PDH) signals Corrigendum 1 1) Clause 6.1.1 Add the following sentence to the end of the first paragraph in 6.1.1: For the purpose of v
19、irtual concatenation, the 1544-kbit/s container frame is the multiframe shown in Figure 6-1. 2) Clause 6.1.2.1 Modify the heading of Figure 6-3 and add notes as follows: Concatenation overhead VLI octet MFI2 bit 8 (LSB) value Bit 1 Bit 2 Bit 3 Bit 4 0 1 2 3 0 4 5 6 7 8 9 10 11 1 12 13 14 15 Member n
20、umbers NOTE 1 There are 8 member statuses reported per control packet. The 16 members require 2 control packets at a rate of 48 ms each for the 1544 kbit/s signal and 32 ms each for the 2048-kbit/s signal. If there is only one return channel, this results in the member status being refreshed every 9
21、6 ms for the 1544-kbit/s signal and every 64 ms for the 2048-kbit/s signal. NOTE 2 Since there is a maximum of 16 members, only the MFI2 bit 8 (LSB) is used to determine which member status is transmitted in the 8-bit MST field of a control packet. MFI2 bit 8 corresponds to concatenation overhead oc
22、tet bit 4 when MFI1 = 1001. The interpretation of the member status bits according to this table is based on the MFI2 value at the moment the member status word is received. In other words, MFI2 bit 8 is read and used as an index into this table to identify the members for which the status will be s
23、ent in the subsequent MST field. This subsequent MST field is carried in the first 8 bits of the next control packet. Figure 6-3/G.7043/Y.1343 Member status bit assignments for N 1544/2048 kbit/s signals 3) Clause 6.1.2.2 Modify 6.1.2.2 as follows: All N 1544 kbit/s member signals that constitute a
24、VCG are aligned at their transmission from the VCG source with respect to their 1544-kbit/s clock frequency, PDH signal frame and multiframe, MFI1 and MFI2. The VCG sink can determine the differential delay that the different members encountered in the network by comparing their respective MFI1 and
25、MFI2 values, and performing the proper realignment. Note that the four MSBs of MFI2 are not used for differential delay compensation. The maximum differential delay that can be detected is (256)(24)(125s)/2 = 384 ms. Note that even though they are not used for differential delay calculation, the fou
26、r MFI2 MSBs shall continue to increment as part of the 12-bit MFI1-MFI2 counter. 2 ITU-T Rec. G.7043/Y.1343 (2004)/Cor.1 (12/2006) 4) Clause 6.2.1 Add the following sentence to the end of the first paragraph in 6.2.1: For the purpose of virtual concatenation, the 2048-kbit/s container frame is the m
27、ultiframe shown in Figure 6-4. 5) Clause 6.2.2.2 Modify 6.2.2.2 as follows: The differential delay compensation for the 2048 kbit/s signal is the same as specified in 6.1.2.2 except that the clock frequency is 2048 kbit/s. Note that the four MSBs of MFI2 are not used for differential delay compensat
28、ion. The maximum differential delay that can be detected is (256)(16)(125s)/2 = 256 ms. Note that even though they are not used for differential delay calculation, the four MFI2 MSBs shall continue to increment as part of the 12-bit MFI1-MFI2 counter. 6) Clause 6.3.1 Add the following sentence to th
29、e end of the first paragraph in 6.3.1: For the purpose of virtual concatenation, the 34 368-kbit/s container frame is the multiframe shown in Figure 6-5. 7) Clause 6.3.2.1 Modify the heading of Figure 6-7 as follows: Concatenation overhead VLI octet Frame number (MFI1) Bit 1 Bit 2 Bit 3 Bit 4 0 0 1
30、2 3 1 4 5 6 7 Member numbers Figure 6-7/G.7043/Y.1343 Member status bit assignments for N 34 368 and N 44 736 kbit/s signals 8) Clause 6.3.2.2 Modify 6.3.2.2 as follows: All N 34 368 kbit/s member signals that constitute a VCG are aligned at their transmission from the VCG source with respect to the
31、ir 34 368 kbit/s clock frequency, PDH signal frame and multiframe, MFI1 and MFI2. The VCG sink can determine the differential delay that the different members encountered in the network by comparing their respective MFI1 and MFI2 values, and performing the proper realignment. The maximum differentia
32、l delay that can be detected is (536537)(8)(212)/2/34368000 = 255256 ms. 9) Clause 6.4.1 Add the following sentence to the end of the first paragraph in 6.4.1: For the purpose of virtual concatenation, the 44 736-kbit/s container frame is the multiframe shown in Figure 6-8. ITU-T Y-SERIES RECOMMENDA
33、TIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y
34、.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interwork
35、ing Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y
36、.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Numbering, naming and addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Secu
37、rity Y.2700Y.2799 Generalized mobility Y.2800Y.2899 For further details, please refer to the list of ITU-T Recommendations. Printed in Switzerland Geneva, 2007 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network opera
38、tion, 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 tr
39、ansmission 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 Maint
40、enance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph service
41、s 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
