1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.798 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2 (01/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Other terminal equipment Characteristics of opti
2、cal transport network hierarchy equipment functional blocks Amendment 2 Recommendation ITU-T G.798 (2012) Amendment 2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON
3、 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-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.4
4、00G.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.709 Coding of voice and audio signals G.710G.729 Principal characteristics of primary multiplex equipment G.730
5、G.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.760G.769 Operations, administration and maintenance features of trans
6、mission 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 G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC
7、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 refer to the list of ITU-T Recommendations. Rec. ITU-T G.798 (201
8、2)/Amd.2 (01/2015) i Recommendation ITU-T G.798 Characteristics of optical transport network hierarchy equipment functional blocks Amendment 2 Summary Amendment 2 to Recommendation ITU-T G.798 (2012) contains material related to the: addition of adaptation functions for 64B/66B encoded client signal
9、s with forward error correction (FEC); addition of FC-1600 client signals with optional FEC. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.798 2002-01-06 15 11.1002/1000/5604 1.1 ITU-T G.798 (2002) Amd. 1 2002-06-13 15 11.1002/1000/6057 2.0 ITU-T G.798 2004-06-13 15 11.1
10、002/1000/7329 3.0 ITU-T G.798 2006-12-14 15 11.1002/1000/8983 3.1 ITU-T G.798 (2006) Amd. 1 2008-12-12 15 11.1002/1000/9669 3.2 ITU-T G.798 (2006) Cor.1 2009-01-13 15 11.1002/1000/9647 4.0 ITU-T G.798 2010-10-22 15 11.1002/1000/10877 4.1 ITU-T G.798 (2010) Cor. 1 2011-04-13 15 11.1002/1000/11117 4.2
11、 ITU-T G.798 (2010) Amd. 1 2011-07-22 15 11.1002/1000/11116 4.3 ITU-T G.798 (2010) Cor. 2 2012-02-13 15 11.1002/1000/11488 4.4 ITU-T G.798 (2010) Amd. 2 2012-04-06 15 11.1002/1000/11487 5.0 ITU-T G.798 2012-12-22 15 11.1002/1000/11778 5.1 ITU-T G.798 (2012) Amd. 1 2014-05-14 15 11.1002/1000/12179 5.
12、2 ITU-T G.798 (2012) Amd. 2 2015-01-13 15 11.1002/1000/12367 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.798 (2012)/A
13、md.2 (01/2015) 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 respo
14、nsible 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 I
15、TU-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 collaborati
16、ve 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 man
17、datory 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.
18、The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 2015 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.798 (2012)/Amd.2 (01/2015) iii Table of Contents Page 1) Scope . 1 2) Modifications to ITU-T G.798 . 1 2.1) Clause 4 1 2.2) Annex A, Introduction 1 2.3) Clause A.3.1.1 1 2.4
22、) Clause A.3.1.2 3 2.5) Clause A.3.1.3 5 2.6) Clause A.3 5 2.7) Bibliography . 13 Rec. ITU-T G.798 (2012)/Amd.2 (01/2015) 1 Recommendation ITU-T G.798 Characteristics of optical transport network hierarchy equipment functional blocks Amendment 2 1) Scope This amendment contains text modifications an
23、d additions extending the set of constant bit rate signal of bit rate range x (CBRx) atomic functions in ITU-T G.798 to support 64B/66B encoded clients with optional or mandatory forward error correction (FEC). 2) Modifications to ITU-T G.798 2.1) Clause 4 In clause 4, add the following abbreviation
24、s in alphabetical order: dLFA Loss of FEC word Alignment defect dLOCA Loss Of Client Alignment defect FCWS FEC code word start 2.2) Annex A, Introduction Modify Table A.1B as follows: Table A.1B Jitter standard and replacement signals (fibre channel) x Jitter standard Replacement signal FEC FC-100 b
25、-ANSI INCITS 352 17.7.1.2 of ITU-T 709 None FC-200 b-ANSI INCITS 352 17.7.2.1 of ITU-T 709 None FC-400 b-ANSI INCITS 352 17.9.1 of ITU-T 709 None FC-800 b-ANSI INCITS 352 17.9.1 of ITU-T 709 None FC-1200 b-ANSI INCITS 364 17.8.2 of ITU-T 709 None FC-1600 b-ANSI INCITS 352 17.9.2 of ITU-T 709 Optiona
26、l b-ANSI INCITS 470 NOTE FC-y is used throughout this clause as shorthand for the defined values for x for fibre channel type interfaces. 2.3) Clause A.3.1.1 Modify clause A.3.1.1 header as follows: A.3.1.1 OSx to CBRx adaptation source function without FEC (OSx/CBRx_A_So) (x = 2G5, 10G, 40G, FC-y)
27、Modify clause A.3.1.1 as follows: For SDH OSn type interfaces and fibre channel type interfaces, the information flow and processing of the OSx/CBRx_A_So function is defined with reference to Figures A.7 and A.8. 2 Rec. ITU-T G.798 (2012)/Amd.2 (01/2015) NOTE For SDH OSM256.4 type interfaces, please
28、 see A.3.1.1.3A.3.1.3. Symbol G . 798(1 2)_ FA . 7O S x/C B R xO S x_A PC B R x_C PG . 7 9 8 (1 2 )- A md . 2 (1 5 )_ F A . 7O Sx CBRx/O Sx _ A PC B R x _ C PO Sx / C B R x _ A _ So _ M PFigure A.7 OSx/CBRx_A_So function Interfaces Table A.4 OSx/CBRx_A_So inputs and outputs Input(s) Output(s) CBRx_C
29、P: CBRx_CI_D CBRx_CI_CK OSx/CBRx_A_So_MP: OSx/CBRx_A_So_MI_Active OSx_AP: OSx_AI_D Processes The processes associated with the OSx/CBRx_A_So function are depicted in Figure A.8. Activation The OSx/CBRx_A_So function shall access the access point when it is activated (MI_Active is true). Otherwise, i
30、t shall not access the access point. Mod (optical carrier modulation): See clause 8.11.1. For parameters of SDH type interfaces, ITU-T G.957 and ITU-T G.691 apply. Optical signal pre-conditioning: Pre-conditioning of the single wavelength optical signal might be required. The specific conditioning p
31、rocesses depend on the OSx interface type (see ITU-T G.957 and ITU-T G.691 for SDH type interfaces). For optical pre-conditioning processes, see clause 8.11.2. For SDH type interfaces, the jitter and wander requirements, as defined in clause 9.3.1.1 of ITU-T G.783, apply. For fibre channel type inte
32、rfaces, the input clock ranges are defined in Table A.1A and the jitter and wander requirements, as defined in the specifications referenced in Table A.1B, apply. Rec. ITU-T G.798 (2012)/Amd.2 (01/2015) 3 G . 7 9 8 (1 2 )_ F A. 8C B R x _ C PC I_ D C I_ C KO p ticals ig n alp re-co n d itio n in gA
33、I_ DO Sx _ A PMo dG . 7 9 8 (1 2 )-Amd . 2 (1 5 )_ F A. 8C BR x _ C PCI_ D CI_ CKO p t i cals i g n alp re- co n d i t i o n i n gA I_ DOSx _ A PMo dMI_ A ct i v eOSx/CBRx_A_So_MPFigure A.8 OSx/CBRx_A_So processes 2.4) Clause A.3.1.2 Modify clause A.3.1.2 header as follows: A.3.1.2 OSx to CBRx adapt
34、ation sink function without FEC (OSx/CBRx_A_Sk) (x = 2G5, 10G, 40G, FC-y) Modify clause A.3.1.2 as follows: For SDH OSn type interfaces and fibre channel type interfaces, the information flow and processing of the OSx/CBRx_A_Sk function is defined with reference to Figures A.9 and A.10. NOTE For SDH
35、 OSM256.4 type interfaces, please see clause A.3.1.1.4A.3.1.4. 4 Rec. ITU-T G.798 (2012)/Amd.2 (01/2015) Symbol G . 798(1 2)_ FA . 9O S x/C B R xO S x_A PC B R x_C PG . 7 9 8 (1 2 )-A md . 2 (1 5 )_ F A. 9O Sx CBRx/O Sx _ A PCBR x _ CPO Sx / CBR x _ A _ Sk _ MPFigure A.9 OSx/CBRx_A_Sk function Inter
36、faces Table A.5 OSx/CBRx_A_Sk inputs and outputs Input(s) Output(s) OSx_AP: OSx_AI_D OSx_AI_TSF OSx/CBRx_A_Sk_MP: OSx/CBRx_A_Sk_MI_Active CBRx_CP: CBRx_CI_D CBRx_CI_CK CBRx_CI_SSF Processes The processes associated with the OSx/CBRx_A_Sk function are depicted in Figure A.10. Activation The OSx/CBRx_
37、A_Sk function shall access the access point and perform the common and specific processes operation specified below when it is activated (MI_Active is true). Otherwise, it shall activate the SSF signals at its output (CP) and not report its status via the management point. Optical signal post-condit
38、ioning: Post-conditioning of the single wavelength signal might be required. The specific conditioning processes depend on the OSx interface type (see ITU-T G.957 and ITU-T G.691 for SDH type interfaces). For optical post-conditioning processes, see clause 8.11.2. DMod (optical carrier demodulation)
39、: See clause 8.11.1. For parameters of SDH type interfaces, ITU-T G.957 and ITU-T G.691 apply. Clock recovery: The function shall recover the clock signal from the incoming data. For SDH type interfaces, the input clock ranges are defined in Table A.1 and the jitter and wander requirements, as defin
40、ed in clause 9.3.1.2 of ITU-T G.783, apply. For fFibre cChannel type interfaces, the input clock ranges are defined in Table A.1A and the jitter and wander requirements, as defined in the specifications referenced in Table A.1B, apply. Rec. ITU-T G.798 (2012)/Amd.2 (01/2015) 5 To ensure adequate imm
41、unity against the presence of consecutive identical digits (CID) in the signal, the function shall comply with the specification in clause 15.1.4 of ITU-T G.783 for SDH type interfaces. G . 7 9 8 (1 2 )- Amd . 1 (1 4 )_ F A. 1 0C I_ D C I_ C KC B R x _ C PC I_ SSFR ep l ac em en ts i g n al g en er
42、at o rC l o ck re co v er yA I_ PL DO Sx _ A PA I_ T SFD odmO p t i ca l s i g n alp o s t -c o n d i t i o n i n gFigure A.10 OSx/CBRx_A_Sk processes Defects: None. Consequent actions The OSx/CBRx_A_Sk function performs the following consequent actions. aSSF AI_TSF aAIS AI_TSF On declaration of aAI
43、S, the function shall output a replacement signal as defined in clause 16.6 of ITU-T G.709 for SDH type interfaces and in Table A.1B for fibre channel type interfaces within X 6 Rec. ITU-T G.798 (2012)/Amd.2 (01/2015) ms. On clearing of aAIS, the replacement signal shall be removed within Y ms, with
44、 normal data being output. The values for X and Y are for further study. The replacement signal clock start shall be independent from the incoming clock. For the defined values of x, the replacement signal clock has to be within the range defined in Table A.1 for SDH type interfaces and Table A.1A f
45、or fibre channel type interfaces. Defect correlations: None. Performance monitoring: None. 2.5) Clause A.3.1.3 Modify Figure A.11 and Table A.6 in clause A.3.1.3 as follows: OSM 256.4/CBRxOSM 256.4_APCBRx_CPFigure A.11 OSM256.4/CBRx_So function Table A.6 OSM256.4/CBRx_So inputs and outputs Input(s)
46、Output(s) CBRx_CP: CBRx_CI_D CBRx_CI_CK OSM256.4/CBRx_A_So_MP: OSM256.4/CBRx_So_MI_Active OSM256.4_AP: OSM256.4_AI_D OSM256.4_AI_CK OSM256.4_AI_FS OSM256.4/CBRx_A_So_MP: OSM256.4/CBRx_A_So_MI_cLOF 2.6) Clause A.3 Add new clauses A.3.1.5, A.3.1.6 and A.3.1.7 describing OSx/CBRx adaptation functions:
47、A.3.1.5 OSx to CBRx adaptation source function for 64B/66B encoded clients with FEC (OSx/CBRx-b_A_So) (x = FC-y) The information flow and processing of the OSx/CBRx-b_A_So function is defined with reference to Figures A.15 and A.16. Rec. ITU-T G.798 (2012)/Amd.2 (01/2015) 7 Symbol G . 7 9 8 (1 2 )-A
48、 md . 2 (1 5 )_ F A. 1 5O S x CBR x -b/O S x _ A PCBR x _ CPO S x / CBR x -b _ A _ S o _ MPFigure A.15 OSx/CBRx-b_A_So function Interfaces Table A.8 OSx/CBRx-b_A_So inputs and outputs Input(s) Output(s) CBRx_CP: CBRx_CI_D CBRx_CI_CK CBRx_CI_SSF OSx/CBRx-b_A_So_MP: OSx/CBRx-b_A_So_MI_Active OSx_AP: O
49、Sx_AI_D Processes The processes associated with the OSx/CBRx-b_A_So function are depicted in Figure A.16. Activation The OSx/CBRx-b_A_So function shall access the access point when it is activated (MI_Active is true). Otherwise, it shall not access the access point. Block alignment: Block alignment consists of the recovering 64B/66B block lock per the state diagram in Figure 49-12 of IEEE 802.3. Transcoder: Transcoding of the 64B/66B
