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 1 (05/2014) 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 1 Recommendation ITU-T G.798 (2012) Amendment 1 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.1 (05/2014) i Recommendation ITU-T G.798 Characteristics of optical transport network hierarchy equipment functional blocks Amendment 1 Summary Amendment 1 to Recommendation ITU-T G.798 (2012): completes the management interfaces of the optical modulation and wavelength multiplexing processes
9、 for support of WDM interfaces; adds an indication to refer to the HAO capable ODUk to MPLS-TP adaptation function in Recommendation ITU-T G.8121; adds adaptation of multilane 40 Gigabit/s SDH signals with parallel interfaces (STL256.4) for mapping into LO OPU3; adds CM-XGPON and the payload types f
10、or clients bit-synchronously mapped into ODUflex to the ODUkP to CBRx adaptation functions; adds the ODU2eP to FC-1200 signal adaptation functions; adds fibre channel clients to Annex A; and corrects the payload type for SBCON/ESCON clients and the frequency tolerance of ODUflex signals. History Edi
11、tion 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 11.1002/1000/7329 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 1
12、5 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 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
13、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 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web brow
14、ser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.798 (2012)/Amd.1 (05/2014) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and co
15、mmunication technologies (ICTs). 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 Recommendations on them with a view to standardizing telecommunications on a worldwide basis.
16、 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 approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resoluti
17、on 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“ is used for conciseness to indicate both a telecommunication administration and
18、 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 with the Recommendation is achieved when all of these mandatory provisions are me
19、t. 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 required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibi
20、lity 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 Intellectual Property Rights, whether asserted by ITU members or others outside of the Rec
21、ommendation development process. As of the date of approval of this Recommendation, 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 a
22、nd are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2014 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.798 (2012)/Amd.1 (05/2014) 1 Recommendat
23、ion ITU-T G.798 Characteristics of optical transport network hierarchy equipment functional blocks 1 Scope This amendment contains modified text to be added to complete Recommendation ITU-T G.798, by adding missing management information (MI) with respect to optical channel (OCh) optical interface a
24、pplication code and frequency/wavelength support of the wavelength assignment process for support of wave division multiplexing (WDM) interfaces and by completing content on ODUflex mapped signals, fibre channel client interfaces, and STM256 multilane interfaces. 2) Modifications to ITU-T G.798 2.1)
25、 Clause 2, References In clause 2, add the following references: ITU-T G.694.2 Recommendation ITU-T G.694.2 (2003), Spectral grids for WDM applications: CWDM wavelength grid. ITU-T G.695 Recommendation ITU-T G.695 (2010), Optical interfaces for coarse wavelength division multiplexing applications. I
26、TU-T G.696.1 Recommendation ITU-T G.696.1 (2010), Longitudinally compatible intra-domain DWDM applications. ITU-T G.698.1 Recommendation ITU-T G.698.1 (2009), Multichannel DWDM applications with single-channel optical interfaces. ITU-T G.698.2 Recommendation ITU-T G.698.2 (2009), Amplified multichan
27、nel dense wavelength division multiplexing applications with single channel optical interfaces. ITU-T G.8121 Recommendation ITU-T G.8121/Y.1381 (2013), Characteristics of MPLS-TP equipment functional blocks. 2.2) Clause 8.11.1, Optical modulation and wavelength multiplexing processes Update clause 8
28、.11.1 with the additional text: 8.11.1 Optical modulation and wavelength multiplexing processes The processes listed below are mandatory when they are listed in atomic functions. Specific parameters of these processes depend on the interface type. Refer to ITU-T G.959.1, ITU-T G.694.2, ITU-T G.696.1
29、, ITU-T G.695, ITU-T G.698.1, ITU-T G.698.2 and ITU-T G.694.1 for the currently standardized OTN interfaces and central frequencies. The parameters are managed, if applicable, by the MI_nominalCentralFrequencyOrWavelength (both input and output), MI_selectedApplicationIdentifier, and MI_supportableA
30、pplicationIdentifierList management interfaces. Optical carrier modulation (Mod): This process performs modulation of an optical carrier with the payload signal (PLD) signal by means of a defined modulation scheme. The modulation scheme and optical parameters (e.g., operating wavelength) depend on t
31、he specific interface type. This process is used for the generation of a non-coloured optical signal. 2 Rec. ITU-T G.798 (2012)/Amd.1 (05/2014) Optical carrier modulation and wavelength assignment (Mod/WA): This process performs modulation of an optical carrier of a specific wavelength with the payl
32、oad (PLD) signal by means of a defined modulation scheme. The modulation scheme and optical parameters for the individual channels (e.g., central frequency) depend on the specific interface type. This process is used for the generation of a coloured optical signal. Optical carrier demodulation (DMod
33、): This process demodulates the payload signal (PLD) signal from the optical carrier. The modulation scheme depends on the specific interface type. This process is used for the termination of coloured and non-coloured optical signal. Optical multiplexing (OM): This process performs optical channel m
34、ultiplexing to form an optical multiplex signal. Optical demultiplexing and wavelength selection (ODM/WS): This process performs the optical channel demultiplexing and provides access to the individual wavelength signals. The physical parameters (e.g. channel spacing) depend on the specific interfac
35、e type. 2.3) Clause 12.2.1, OCh trail termination function (OCh_TT) Update the text and figures in clause 12.2.1 as follows: 12.2.1 OCh trail termination function (OCh_TT) The OCh_TT functions are responsible for the end-to-end supervision of the OCh trail. They provide full functionality based on t
36、he non-associated overhead information. Figure 12-7 shows the combination of the unidirectional sink and source functions to form a bidirectional function. G .798 (1 0) _F 12- 7O C h_A P O C h_A POhCOhCO C h_T C PO C h_T C PFigure 12-7 OCh_TT 12.2.1.1 OCh trail termination source function (OCh_TT_So
37、) The OCh_TT_So function conditions the data for transmission over the optical medium and presents it at the OCh_TCP. The information flow and processing of the OCh_TT_So function is defined with reference to Figures 12-8 and 12-9. Symbol Figure 12-8 OCh_TT_So function Rec. ITU-T G.798 (2012)/Amd.1
38、(05/2014) 3 Interfaces Table 12-2 OCh_TT_So inputs and outputs Input(s) Output(s) OCh_AP: OCh_AI_D OCh_TT_So_MP: OCh_TT_So_MI_nominalCentralFrequencyOrWavelength OCh_TT_So_MI_selectedApplicationIdentifier OCh_TCP: OCh_CI_PLD OCh_TT_So_MP: OCh_TT_So_MI_nominalCentralFrequencyOr Wavelength OCh_TT_So_M
39、I_supportableApplicationIdentifierList Processes The processes associated with the OCh_TT_So function are as depicted in Figure 12-9. Payload generation: The function shall generate the OCh payload signal (baseband signal). The physical specifications of the signal are outside the scope of this Reco
40、mmendation. Optical carrier modulation and wavelength assignment (Mod/WA): See clause 8.11.1. Optical signal pre-conditioning: Pre-conditioning of the single wavelength optical signal might be required. The specific conditioning processes depend on the OTM-n interface type and are outside the scope
41、of this Recommendation. The processes OA, DAc, DAa and PMDC, as defined in clause 8.11.2, are possible. Figure 12-9 OCh_TT_So processes Defects: None. Consequent actions: None. Defect correlations: None. Performance monitoring: None. 4 Rec. ITU-T G.798 (2012)/Amd.1 (05/2014) 12.2.1.2 OCh trail termi
42、nation sink function (OCh_TT_Sk) The OCh_TT_Sk function recovers the OCh payload signal and reports the state of the OCh trail. It extracts the OCh overhead including the FDI-P, FDI-O and OCI signals from the OCh signal at its OCh_TCP, detects for LOS, OCI, FDI-P and FDI-O defects. Symbol G. 798 (10
43、)_F 12-10O Ch_ A POhCO Ch_ T CPO Ch_ T T _S k_M PFigure 12-10 OCh_TT_Sk function Interfaces Table 12-3 OCh_TT_Sk inputs and outputs Input(s) Output(s) OCh_TCP: OCh_CI_PLD OCh_CI_OH OCh_CI_SSF-P OCh_CI_SSF-O OCh_AP: OCh_AI_D OCh_AI_TSF-P OCh_AI_TSF-O OCh_TT_Sk_MP: OCh_TT_Sk_MI_cLOS-P OCh_TT_Sk_MI_cOC
44、I OCh_TT_Sk_MI_cSSF OCh_TT_Sk_MI_cSSF-P OCh_TT_Sk_MI_cSSF-O OCh_TT_Sk_MI_supportableApplicationIdentifierList Processes The processes associated with the OCh_TT_Sk function are as depicted in Figure 12-11. Optical carrier demodulation (DMod): See clause 8.11.1. Optical signal post-conditioning: Post
45、-conditioning of the single wavelength signal might be required. The specific conditioning processes depend on the OTM-nr/OTM-0 interface type (see ITU-T G.959.1) and are outside the scope of this Recommendation. The processes OA, DAc, DAa and PMDC, as defined in clause 8.11.2, are possible. Payload
46、 recovery: This function shall recover the OCh payload signal. The physical specifications of the signal are outside the scope of this Recommendation. FDI-P: The FDI-P information (OCh-FDI-P) shall be extracted from the OCh overhead of the OOS. It shall be used for FDI-P defect detection. The specif
47、ic implementation for extracting FDI-P from the OOS and detecting its value is outside the scope of this Recommendation. Rec. ITU-T G.798 (2012)/Amd.1 (05/2014) 5 FDI-O: The FDI-O information (OCh-FDI-O) shall be extracted from the OCh overhead of the OOS. It shall be used for FDI-O defect detection
48、. The specific implementation for extracting FDI-O from the OOS and detecting its value is outside the scope of this Recommendation. OCI: The OCI information (OCh-OCI) shall be extracted from the OCh overhead of the OOS. It shall be used for OCI defect detection. The specific implementation for extr
49、acting OCI from the OOS and detecting its value is outside the scope of this Recommendation. 6 Rec. ITU-T G.798 (2012)/Amd.1 (05/2014) Rec. ITU-T G.798 (2012)/Amd.1 (05/2014) 7 G . 7 9 8 _ F 1 2 -1 1E x t r a c t FD I - OE x t r a c t FD I - PE x t r a c t O CIL O S- P d e t e c t i o nd FD I - Od L O S- Pd FD I - Pd O CIdLOS-PdFDI-PdFDI-OCI_PLDCI_OHCI_SSF-OCI_SSF-PAI_TSF-PAI_TSF-OAI_DMI _ c L O S- PMI _ c SS F- PMI _ c SS F- OMI _ c O CIOC h_ A POC h_ TC PPayloadrecoveryOCh_TT_
