1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.7043/Y.1343TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(01/2005) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments General SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASP
2、ECTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Virtual concatenation of plesiochronous digital hierarchy (PDH) signals Amendment 1 ITU-T Recommendation G.7043/Y.1343 (2004) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS
3、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 CARRIER TELEP
4、HONE 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 SECTIONS AND DIGITAL
5、 LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE - GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 General G.7000G.7099 Coding of analogue signals by pulse code modulation G.7100G.7199 Coding of analogue
6、 signals by methods other than PCM G.7200G.7299 Principal characteristics of primary multiplex equipment G.7300G.7399 Principal characteristics of second order multiplex equipment G.7400G.7499 Principal characteristics of higher order multiplex equipment G.7500G.7599 Principal characteristics of tra
7、nscoder and digital multiplication equipment G.7600G.7699 Operations, administration and maintenance features of transmission equipment G.7700G.7799 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.7800G.7899 Other terminal equipment G.7900G.7999 DIGITAL NE
8、TWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.7043/Y.1343 (2004)/Amd.1 (01/2005) i ITU-T Recommendation G.7043/Y.1343 Virtual concatenation of plesiochronous digital hierarchy (PDH) signals Amendment 1 Summary This amendment changes the spec
9、ification of frame formats from nibbles to octets. Source Amendment 1 to ITU-T Recommendation G.7043/Y.1343 (2004) was approved on 13 January 2005 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.7043/Y.1343 (2004)/Amd.1 (01/2005) FOREWORD The Interna
10、tional 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 and tariff questions and issuing Recommendati
11、ons 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 Recommendations on these topics. The approva
12、l 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 Recommendation, the expression “Administration
13、“ 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. interoperability or applicability) and compliance wi
14、th 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 compliance with the Recommendation is requir
15、ed 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, validity or applicability of claimed Intellectu
16、al 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 required to implement this Recommendation. Howe
17、ver, implementors are cautioned that this may not represent the latest information and are 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. I
18、TU-T Rec. G.7043/Y.1343 (2004)/Amd.1 (01/2005) 1 ITU-T Recommendation G.7043/Y.1343 Virtual concatenation of plesiochronous digital hierarchy (PDH) signals Amendment 1 Modify clause 6.4 as follows: 6.4 Interface at N 44 736 kbit/s with virtual concatenation of a clear channel payload 6.4.1 Multifram
19、e format for N 44 736 kbit/s The multiframe structure for 44 736 kbit/s signal described in ITU-T Rec. G.704 shall be used. For the case of an N 44 736 kbit/s signal, the first octet (two nibbles) following the first framing bit (X1) of the multiframe is used to carry the concatenation overhead in e
20、ach constituent 44 736 kbit/s signal, as illustrated in Figure 6-8. This octet is reserved for all values of N (N = 18). 6.4.2 Concatenation of N 44 736 kbit/s signals The concatenation overhead octet allows the virtual concatenation of N 44 736 kbit/s signals to form a single channel referred to as
21、 a virtual concatenation group (VCG). The payload container bandwidth of the resulting VCG is N (44 736)(7)(680 8) 8/(7)(680) kbit/s N 44 134 kbit/s. Client data signals are mapped into the N 44 736 kbit/s signal members of the VCG on an nibbleoctet-wise, round robin basis. The round robin sequence
22、follows the ascending order of the per-member sequence numbers that are communicated in each members concatenation overhead octet. For example, if the most significant nibble of GFP frame data packets octet 1 is mapped into the 44 736 kbit/s signal with sequence number 0, the least significant nibbl
23、e of GFP frame octet 1 next packet octet is mapped into the 44 736 kbit/s signal with sequence number 1, the most significant nibble of GFP frame octet 2 is mapped into the 44 736 kbit/s signal with sequence number 2, etc. Up to eight 44 736 kbit/s signals can be virtually concatenated into a single
24、 VCG. NOTE The bits F1, F2, F3 and F4 will be located in the middle of a data packets octet. ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middle
25、ware 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 and applications Y.1100Y
26、.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.1799 Charging Y.1800Y.1899 NEXT GEN
27、ERATION 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 networks in NGN Y.2250Y.2299 Numbering, naming and
28、 addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 For further details, please refer to the list of ITU-T Recommendations. Printed in Switzerland Geneva, 2005 SERIES OF ITU-T RECOMM
29、ENDATIONS 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 media, digital systems and networks S
30、eries 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, installation and protection of cables and other
31、 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 transmission quality, telephone installat
32、ions, 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
