1、 International Telecommunication Union ITU-T G.707/Y.1322TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(11/2009) 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 Network node interface for the synchronous digital hierarchy (SDH) Amendment 2 Recommendation ITU-T G.707/Y.1322 (2007) Amendment 2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNA
3、TIONAL 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 TELEPHONE SY
4、STEMS 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 General G.700G.709Coding of voice and audio
5、 signals G.710G.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
6、 equipment G.760G.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 DIG
7、ITAL 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 ACCESS NETWORKS G.9000G.9999 For further
8、 details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.707/Y.1322 (2007)/Amd.2 (11/2009) i Recommendation ITU-T G.707/Y.1322 Network node interface for the synchronous digital hierarchy (SDH) Amendment 2 Summary Amendment 2 to Recommendation ITU-T G.707/Y.1322 contains additional
9、material to be incorporated in the Recommendation and adds the necessary functionality for adaptation of STM-256 over multichannel parallel interfaces. Source Amendment 2 to Recommendation ITU-T G.707/Y.1322 (2007) was approved on 13 November 2009 by ITU-T Study Group 15 (2009-2012) under Recommenda
10、tion ITU-T A.8 procedures. ii Rec. ITU-T G.707/Y.1322 (2007)/Amd.2 (11/2009) 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 Standardizat
11、ion 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 Assembly (WTSA), which mee
12、ts 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 which fall within ITU-Ts
13、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 this Recommendation is
14、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 language such as “must“ and
15、 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 this Recommendation may invo
16、lve 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 of approval of this Reco
17、mmendation, 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 TSB patent database at ht
18、tp:/www.itu.int/ITU-T/ipr/. ITU 2010 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.707/Y.1322 (2007)/Amd.2 (11/2009) 1 Recommendation ITU-T G.707/Y.1322 Network node interface for the synchronous
19、 digital hierarchy (SDH) Amendment 2 1 Modify clause 4 Add the following abbreviation to clause 4: STL Synchronous Transport Lane 2 Modify Table 6-2 Enhance Table 6-2 with the bit-rate of an STL-256.4: Table 6-2 SDH hierarchical bit rates Synchronous digital hierarchy level Hierarchical bit rate (kb
20、it/s) 0 51 840 1 155 5204 622 080 16 2 488 320 64 9 953 280 256 39 813 120 STL-256.4 9 953 280 NOTE The specification of levels higher than 256 requires further study. 3 Add new clause 6.7 Add the following clause: 6.7 Parallel interfaces STM-256 may be inversely multiplexed over four STL-256.4s. Se
21、e Annex I for the inverse multiplexing of STM-256 over STL-256.4s. The four STL-256.4s are optically multiplexed onto a single multilane section (see Rec. ITU-T G.783). NOTE Interconnection of equipment that supports the newer synchronous transport lane (STL) structures with older equipment only sup
22、porting the non-STL interface defined in older versions of this Recommendation cannot be achieved automatically. For interconnection of equipment supporting the newer STL structures with older equipment only supporting the non-STL interface defined in older versions of this Recommendation, it will b
23、e necessary for the former to support the non-STL interface. 2 Rec. ITU-T G.707/Y.1322 (2007)/Amd.2 (11/2009) 4 Insert new Annex I Add the following annex: Annex I Adaptation of STM-256 over multichannel parallel interfaces (This annex forms an integral part of this Recommendation) NOTE This mechani
24、sm is designed to allow the use of the optical modules being developed for IEEE 40GBASE-R signals for short-reach client-side STM-256 interfaces. So that STM-256 signals may be carried over parallel interfaces consisting of four lanes, the STM-256 frame is inversely multiplexed over physical/logical
25、 lanes on a 16-byte boundary aligned with the frame as illustrated in Figure I.1. 1 691201 1:16 17:32 33:48 49:64 69105:691202 69121:69136 69137:69152 69153:69168 69169:69184 138225:1382403 138241:138256 138257:138272 138273:138288 138289:138304 207345:2073604 207361:207376 207377:207392 207393:2074
26、08 207409:207424 276465:2764805 276481:276496 276497:276512 276513:276528 276529:276544 345585:3456006 345601:345616 345617:345632 345633:345648 345649:345664 414705:4147207 414721:414736 414737:414752 414753:414768 414769:414784 483825:4838408 483841:483856 483857:483872 483873:483888 483889:483904
27、 552945:5529609 552961:552976 552977:552992 552993:553008 553009:553024 622065:622080 Figure I.1 STM-256 frame divided on 16-byte boundary Each 16-byte increment of the STM-256 frame is distributed, round robin, to each of the four physical lanes as illustrated in Figure I.2. Next f rameLane 0 1:16
28、65:80 705:720 (A1) 769:784 (A2) 622017:622032 1:16Lane 1 17:32 81:96 721:736 (A1) 785:800 (A2) 622033:622048 17:32Lane 2 33:48 97:112 737:752 (A1) 801:816 (A2) 622049:622064 33:48Lane 3 49:64 113:128 753:768 (A1) 817:832 (A2) 622065:622080 49:64 Figure I.2 Distribution of bytes from STM-256 to paral
29、lel lanes Since the STM-256 frame has 64 unscrambled A1 bytes followed by 64 unscrambled A2 bytes, each lane receives 16 A1 bytes followed by 16 A2 bytes. The last A2 byte position in each lane is borrowed as a logical lane marker. For maximum skew detection range, the lane marker value increments b
30、y four on successive frames (from 0 to 252 for lane 0, from 1 to 253 for lane 1, from 2 to 254 for lane 2 and from 3 to 255 for lane 3). The logical lane number can be recovered from this value by a modulo 4 operation. Since a possible future application may re-form a single bit stream via a simple
31、bit multiplex of the four lanes, it is necessary to delay the lanes with respect to each other to avoid the frame alignment bytes overlapping and producing a portion of the frame with very low clock content. Consequently, the lanes must be arranged to have at least 32 bytes of time offset between th
32、e A1 to A2 transition of any two of the lanes. Rec. ITU-T G.707/Y.1322 (2007)/Amd.2 (11/2009) 3 The parallel lanes can be reassembled at the sink by first recovering framing on each of the parallel lanes using the 16 A1 bytes followed by 15 A2 bytes. As lane positions may not be preserved by the opt
33、ical modules to be used for this application, the lanes are identified using the lane marker in the byte following the fifteenth A2 byte, deskewed, and reassembled into the original STM-256 frame according to the lane marker. Since each lane marker cycles through 64 distinct values, the lanes can be
34、 deskewed and reassembled by the receiver as long as the total skew does not exceed 32 STM-256 frame periods (approximately 4 ms). In mapping from lanes back to the STM-256 frame, the byte following the fifteenth A2 byte which was borrowed for lane marking is restored to the value A2. This mechanism
35、 handles any normally framed STM-256 sequence. The additional sequence to be handled is generic AIS, which is an unframed PN-11 sequence at the STM-256 rate. The source function for this adaptation will detect generic AIS by recognizing the PN-11 sequence. While receiving generic AIS, the source fun
36、ction for distributing the STM-256 to parallel lanes will generate a framing pattern of 16 A1 + 15 A2 + 0xFF once per 155520 bytes at the STL bit rate as specified in Table 6-2 on each of the logical lanes. The remainder of the frame is the PN-11 pattern distributed in 16-byte increments across the
37、lanes. When the sink function sees the lane marker fixed at 0xFF on any lane, it will generate a PN-11 sequence at the STM-256 rate in the egress direction. ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS GLOBAL INFORMATION INF
38、RASTRUCTURE 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.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCO
39、L ASPECTS General Y.1000Y.1099 Services 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, administrat
40、ion and maintenance Y.1700Y.1799 Charging 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 as
41、pects: 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 Future networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier gra
42、de open environment Y.2900Y.2999 For further details, please refer to the list of ITU-T Recommendations. Printed in Switzerland Geneva, 2010 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone ser
43、vice, 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 transmission of telev
44、ision, 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: internation
45、al 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 Series T Terminal
46、s 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
