1、 International Telecommunication Union ITU-T G.709/Y.1331TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(04/2011) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments General SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPE
2、CTS AND NEXT-GENERATION NETWORKS Internet protocol aspects Transport Interfaces for the Optical Transport Network (OTN) Amendment 2 Recommendation ITU-T G.709/Y.1331 (2009) Amendment 2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE
3、 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 TELEPHONE SYSTEMS ON RADIO-R
4、ELAY 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 General G.700G.709Coding of voice and audio signals G.710G.
5、729 Principal characteristics of primary multiplex equipment G.730G.739 Principal characteristics of second order multiplex equipment G.740G.749 Principal characteristics of higher order multiplex equipment G.750G.759 Principal characteristics of transcoder and digital multiplication equipment G.760
6、G.769 Operations, administration and maintenance features of transmission equipment G.770G.779 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM
7、 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 ACCESS NETWORKS G.9000G.9999 For further details, please
8、 refer to the list of ITU-T Recommendations. Rec. ITU-T G.709/Y.1331 (2009)/Amd.2 (04/2011) i Recommendation ITU-T G.709/Y.1331 Interfaces for the Optical Transport Network (OTN) Amendment 2 Summary Amendment 2 to Recommendation ITU-T G.709/Y.1331 (2009) contains extensions related to the addition o
9、f Infiniband single, double and quad data rate (IB SDR, IB DDR and IB QDR) client mappings, enhancement of the recommended ODUflex(GFP) bit rate values, modification of the BIP-8 processing in 40GBASE-R and 100GBASE-R, clarification of the ODU maintenance signal (AIS, LCK, OCI) bit rate range, clari
10、fication of the number of tributary slots occupied by ODUflex signals transported in OPU2, OPU3 and OPU4, and extension of Table IX.1 with additional clients into LO OPU mapping types and replacement of “n“ in CnDby their standardized values. History Edition Recommendation Approval Study Group 1.0 I
11、TU-T G.709/Y.1331 2001-02-09 15 1.1 ITU-T G.709/Y.1331 (2001) Amd. 1 2001-11-29 15 2.0 ITU-T G.709/Y.1331 2003-03-16 15 2.1 ITU-T G.709/Y.1331 (2003) Amd. 1 2003-12-14 15 2.2 ITU-T G.709/Y.1331 (2003) Cor. 1 2006-12-14 15 2.3 ITU-T G.709/Y.1331 (2003) Amd. 2 2007-11-22 15 2.4 ITU-T G.709/Y.1331 (200
12、3) Cor.2 2009-01-13 15 2.5 ITU-T G.709/Y.1331 (2003) Amd. 3 2009-04-22 15 3.0 ITU-T G.709/Y.1331 2009-12-22 15 3.1 ITU-T G.709/Y.1331 (2009) Cor. 1 2010-07-29 15 3.2 ITU-T G.709/Y.1331 (2009) Amd. 1 2010-07-29 15 3.3 ITU-T G.709/Y.1331 (2009) Amd. 2 2011-04-13 15 ii Rec. ITU-T G.709/Y.1331 (2009)/Am
13、d.2 (04/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is respon
14、sible 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 Assembly (WTSA), which meets every four years, establishes the topics for study by the IT
15、U-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 which fall within ITU-Ts purview, the necessary standards are prepared on a collaborativ
16、e 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 this Recommendation is voluntary. However, the Recommendation may contain certain mand
17、atory 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 language such as “must“ and the negative equivalents are used to express requirements. T
18、he 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 this Recommendation may involve the use of a claimed Intellectual Property Right. ITU tak
19、es 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 of approval of this Recommendation, ITU had received notice of intellectual property,
20、 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 TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2012 All rights reserved. No
21、part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.709/Y.1331 (2009)/Amd.2 (04/2011) iii Table of Contents Page 1) Scope 1 2) Additions 1 2.1) Clause 3.2 . 1 2.2) Clause 4 1 2.3) Clause 7.3 . 2 2.4) Clause 7.3 . 3 2.5) Claus
22、e 7.3 . 4 2.6) Clause 12.2.5 4 2.7) Figure 12-3 . 5 2.8) Clause 15.9.2.1.1 5 2.9) Clause 17.7.4.1 . 7 2.10) Clause 17.7.5.1 . 7 2.11) Clause 17.9 . 7 2.12) Clause 19.6.1 8 2.13) Clause 19.6.2 9 2.14) Clause 19.6.3 10 2.15) Clause B.3.1 11 2.16) Clause E.3 . 11 2.17) Clause E.3.2 11 2.18) Clause E.4.
23、1 11 2.19) Clause E.4.2 11 2.20) Appendix VIII 12 2.21) Appendix IX . 13 2.22) Appendix X 14 2.23) Appendix XI . 17 2.24) Bibliography . 21 Rec. ITU-T G.709/Y.1331 (2009)/Amd.2 (04/2011) 1 Recommendation ITU-T G.709/Y.1331 Interfaces for the Optical Transport Network (OTN) Amendment 2 1) Scope This
24、amendment contains extensions to ITU-T Recommendation G.709/Y.1331 (2009), related to the addition of: Addition of Infiniband single data rate (IB SDR), Infiniband double data rate (IB DDR) and Infiniband quad data rate (IB QDR) client mappings (clauses 2, 4, 15.9.2.1.1, 17.9, Appendix IX, Bibliogra
25、phy). Enhancement of the recommended ODUflex(GFP) bit rate values (clauses 3.2, 4, 7.3, 12.2.5, Appendix XI). Modification of the BIP-8 processing in 40GBASE-R and 100GBASE-R (clauses 17.7.4.1, 17.7.5.1, B.3.1, E.3, E.3.2, E.4.1, E.4.2). Clarification of the ODU maintenance signal (AIS, LCK, OCI) bi
26、t rate range (clause 7.3). Clarification of the number of tributary slots occupied by ODUflex signals transported in OPU2, OPU3 and OPU4 (clauses 7.3, 19.6.1, 19.6.2, 19.6.3, Appendix VIII, Appendix X). Extension of Table IX.1 with 40GBASE-R, 100GBASE-R, IB SDR, IB DDR and IB QDR client into LO OPU
27、mapping types and replacement of “n“ in CnDby their standardized values (Appendix IX). 2) Additions 2.1) Clause 3.2 Add to clause 3 the following definition: 3.2.1 ODUk.ts: The ODUk.ts is an increment of bandwidth, which, when multiplied by a number of tributary slots, gives the recommended size of
28、an ODUflex(GFP) optimized to occupy a given number of tributary slots of a higher order OPUk. 2.2) Clause 4 Add to clause 4 the following abbreviations: DDR Double Data Rate IB InfiniBand ODUk.ts Optical channel Data Unit k fitting in ts tributary slots QDR Quad Data Rate SDR Single Data Rate 2 Rec.
29、 ITU-T G.709/Y.1331 (2009)/Amd.2 (04/2011) 2.3) Clause 7.3 Modify Tables 7-2 and 7-3 as follows: Table 7-2 ODU types and bit rates ODU type ODU nominal bit rate ODU bit-rate tolerance ODU0 1 244 160 kbit/s 20 ppm ODU1 239/238 2 488 320 kbit/s ODU2 239/237 9 953 280 kbit/s ODU3 239/236 39 813 120 kbi
30、t/s ODU4 239/227 99 532 800 kbit/s ODU2e 239/237 10 312 500 kbit/s 100 ppm ODUflex for CBR client signals 239/238 client signal bit rate client signal bit rate tolerance, with a maximum of 100 ppm (Notes 2, 3) ODUflex for GFP-F mapped client signals configured bit rate (see Table 7-8) 2100 ppm NOTE
31、1 The nominal ODUk rates are approximately: 2 498 775.126 kbit/s (ODU1), 10 037 273.924 kbit/s (ODU2), 40 319 218.983 kbit/s (ODU3), 104 794 445.815 kbit/s (ODU4) and 10 399 525.316 kbit/s (ODU2e). NOTE 2 The bit rate tolerance for ODUflex(CBR) signals is specified as 100 ppm. This value may be larg
32、er than the tolerance for the client signal itself (e.g., 20 ppm). In such cases, the tolerance is determined by the ODUflex(CBR) maintenance signals, which have a tolerance of 100 ppm. NOTE 3 For ODUflex(CBR) signals with nominal bit rates close to the maximum ODTUk.ts payload bit rate and client r
33、ate tolerances less than 100 ppm (e.g., 10 ppm), the ODUflex(CBR) maintenance signal bit rate may exceed the ODTUk.ts payload bit rate. For such cases either an additional tributary slot may be used (i.e., ODTUk.(ts+1), or the nominal bit rate of the ODUflex(CBR) signal may be artificially reduced t
34、o a value of 100 ppm below the maximum ODUflex(CBR) signal bit rate. Table 7-3 OPU types and bit rates OPU type OPU payload nominal bit rate OPU payload bit rate tolerance OPU0 238/239 1 244 160 kbit/s 20 ppm OPU1 2 488 320 kbit/s OPU2 238/237 9 953 280 kbit/s OPU3 238/236 39 813 120 kbit/s OPU4 238
35、/227 99 532 800 kbit/s OPU2e 238/237 10 312 500 kbit/s 100 ppm OPUflex for CBR client signals client signal bit rate client signal bit rate tolerance, with a maximum of 100 ppm OPUflex for GFP-F mapped client signals 238/239 ODUflex signal rate 2100 ppm Rec. ITU-T G.709/Y.1331 (2009)/Amd.2 (04/2011)
36、 3 Table 7-3 OPU types and bit rates OPU type OPU payload nominal bit rate OPU payload bit rate tolerance OPU1-Xv X 2 488 320 kbit/s 20 ppm OPU2-Xv X 238/237 9 953 280 kbit/s OPU3-Xv X 238/236 39 813 120 kbit/s NOTE The nominal OPUk payload rates are approximately: 1 238 954.310 kbit/s (OPU0 Payload
37、), 2 488 320.000 kbit/s (OPU1 Payload), 9 995 276.962 kbit/s (OPU2 Payload), 40 150 519.322 kbit/s (OPU3 Payload), 104 355 975.330 (OPU4 Payload) and 10 356 012.658 kbit/s (OPU2e Payload). The nominal OPUk-Xv Payload rates are approximately: X 2 488 320.000 kbit/s (OPU1-Xv Payload), X 9 995 276.962
38、kbit/s (OPU2-Xv Payload) and X 40 150 519.322 kbit/s (OPU3-Xv Payload). 2.4) Clause 7.3 Replace Table 7-8 with the following: Table 7-8 Recommended ODUflex(GFP) bit rates and tolerance ODU type Nominal bit-rate Tolerance ODU2.ts (Note) 1249177.230 kbit/s ODU3.ts (Note) 1254470.354 kbit/s ODU4.ts (No
39、te) 1301467.133 kbit/s ODUflex(GFP) of n tributary slots, 1 n 8 n ODU2.ts 100 ppm ODUflex(GFP) of n tributary slots, 9 n 32 n ODU3.ts 100 ppm ODUflex(GFP) of n tributary slots, 33 n 80 n ODU4.ts 100 ppm NOTE The values of ODUk.ts are chosen to permit a variety of methods to be used to generate an OD
40、Uflex(GFP) clock. See Appendix XI for the derivation of these values and example ODUflex(GFP) clock generation methods. 4 Rec. ITU-T G.709/Y.1331 (2009)/Amd.2 (04/2011) 2.5) Clause 7.3 Modify Table 7-9 as follows: Table 7-9 Number of tributary slots required for ODUj into HO OPUk # 2.5G tributary sl
41、ots # 1.25G tributary slots LO ODU OPU2 OPU3 OPU1 OPU2 OPU3 OPU4 ODU0 1 1 1 1 ODU1 1 1 2 2 2 ODU2 4 8 8 ODU2e 9 8 ODU3 31 ODUflex(CBR) ODUflex(IB SDR) ODUflex(IB DDR) ODUflex(IB QDR) ODUflex(FC-400) ODUflex(FC-800) Note 1 3 5 4 7 Note 2 3 5 9 4 7 Note 3 2 4 8 4 7 ODUflex(GFP) n n n NOTE 1 Number of
42、tributary slots = Ceiling(ODUflex(CBR) nominal bit rate/(TODTU2.ts nominal bit rate) (1+ODUflex(CBR) bit rate tolerance)/(1HO OPU2 bit rate tolerance). NOTE 2 Number of tributary slots = Ceiling(ODUflex(CBR) nominal bit rate/(TODTU3.ts nominal bit rate) (1+ODUflex(CBR) bit rate tolerance)/(1HO OPU3
43、bit rate tolerance). NOTE 3 Number of tributary slots = Ceiling(ODUflex(CBR) nominal bit rate/(TODTU4.ts nominal bit rate) (1+ODUflex(CBR) bit rate tolerance)/(1HO OPU4 bit rate tolerance). NOTE 4 T represents the transcoding factor. Refer to clauses 17.7.3, 17.7.4 and 17.7.5. 2.6) Clause 12.2.5 Mod
44、ify the text in clause 12.2.5 as follows: ODUflex(GFP) signals are generated using a local clock. This clock may be the local HO ODUk (or OTUk) clock, or an equipment internal clock of the signal over which the ODUflex is carried through the equipment. Any bit rate is possible for an ODUflex(GFP) si
45、gnal, however it is suggested for maximum efficiency that the ODUflex(GFP) will occupy a fixed number of ODTUk.ts payload bytes (in the initial ODTUk.ts)fill an integral number of tributary slots of the smallest HO ODUk path over which the ODUflex(GFP) may be carried. The recommended bit-rates to me
46、et this criteria are specified in Table 7-8. The derivation of the specific values is provided in Appendix XI. NOTE Such ODUflex(GFP) may be transported through more than one HO ODUk path. The Cmvalue will be fixed in the first HO ODUk path; it will not be fixed in the other HO ODUk paths. This fixe
47、d number of bytes per ODTUk.ts is controlled by configuration of the value Cm(refer to Annex D). The value of Cmshould be selected such that the ODUflex signal can be transported over “n“ OPUk tributary slots under worst-case conditions (i.e., maximum ODUflex bit rate and minimum HO OPUk bit rates).
48、 The ODUflex signal may be transported over a series of HO ODUk paths; the following are some example sequences: HO ODU2; HO ODU2 ODU3; HO ODU2 ODU4; HO ODU2 ODU3 ODU4; HO ODU3; HO ODU3 ODU4; HO ODU4. Rec. ITU-T G.709/Y.1331 (2009)/Amd.2 (04/2011) 5 The ODUflex(GFP) has a bit rate tolerance of 20 pp
49、m. This tolerance requires that the maximum value of Cmis 15230 for ODTU2.ts and ODTU3.ts, and 15198 for ODTU4.ts. These Cmvalues are to be reduced when the ODUflex(GFP) signal is generated by, e.g., a HO ODUk clock while the signal has to be transported also over a HO ODUj (j4) and each end of the 100 ppm range.
