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.9802 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (08/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks Optical line systems for local and access networks Multiple
2、-wavelength passive optical networks (MW-PONs) Amendment 1 Recommendation ITU-T G.9802 (2015) 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 TO ALL ANAL
3、OGUE 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.400G.449 COOR
4、DINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND
5、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 Metallic access networks G.9700G.9799 Optical line systems for local and access networks G.9800G.
6、9899 In premises networks G.9900G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.9802 (2015)/Amd.1 (08/2015) i Recommendation ITU-T G.9802 Multiple-wavelength passive optical networks (MW-PONs) Amendment 1 Summary Amendment 1 to Recommendation ITU-T G.9802
7、(2015) continues the maintenance and evolution of the specification of multiple wavelength passive optical network (MW-PON) systems as defined in Recommendation ITU-T G.9802 (2015). History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.9802 2015-04-06 15 11.1002/1000/12398 1.1 I
8、TU-T G.9802 (2015) Amd. 1 2015-08-13 15 11.1002/1000/12540 _ * 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.9802 (2015)/Am
9、d.1 (08/2015) 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 respon
10、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
11、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
12、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
13、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
14、he 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 take
15、s 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 not received notice of intellectual proper
16、ty, 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 2016 All rights reserved.
17、No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.9802 (2015)/Amd.1 (08/2015) iii Table of Contents Page 1) Scope . 1 2) Clause 2 1 3) Clause 6.2.1 Addition of a clarification sentence 1 4) Annex B 2 Annex B Multiple wav
18、elength PONs with WM-based ODN . 2 B.1 Reference architecture 2 B.2 Wavelength assignment 4 B.3 Wavelength tuning 4 B.4 Wavelength resource administration 4 B.5 Wavelength channel performance supervision . 4 Rec. ITU-T G.9802 (2015)/Amd.1 (08/2015) 1 Recommendation ITU-T G.9802 Multiple-wavelength p
19、assive optical networks (MW-PONs) Amendment 1 1) Scope This amendment continues the maintenance and evolution of MW-PON specification as defined in Recommendation ITU-T G.9802 (2015). 2) Clause 2 Add the following reference to clause 2: ITU-T G.989.2 Recommendation ITU-T G.989.2 (2015), 40-Gigabit-c
20、apable passive optical networks 2 (NG-PON2): Physical media dependent (PMD) layer specification. 3) Clause 6.2.1 Addition of a clarification sentence Replace text of clause 6.2.1 with the following (the underlined sentence is added): 6.2.1 ODN There can be several types of ODN architectures to achie
21、ve service distribution in MW-PON. Figures 6-3 and 6-4 show examples of MW-PON with power-splitter-based ODN. Figures 6-5 and 6-6 are examples of MW-PON with wavelength-mux (demux)-based ODN. Figure 6-7 is an example of MW-PON with an ODN consisting of power splitters and multiple feeder fibres. Fig
22、ure 6-8 is an example of MW-PON with an ODN consisting of an NxM wavelength mux (demux) and multiple power splitters. Note that the burst mode receiving capability may be required at the ONUs in the architecture shown in Figures 6-5 and 6-7. Figure 6-9 is a reference diagram of MW-PON with Type C pr
23、otection and an ODN of one-stage power or wavelength mux (demux). Figure 6-10 is a reference diagram of the MW-PON in Figure 6-9 with a two-stage splitter ODN. Figure 6-11 is an example of MW-PON with wavelength muxs (demuxs) at the OLT and at the ODN. Note that Figures 6-3 to 6-11 simply provide re
24、ference examples of the ODN architectures. They are not intended to limit designs and implementations of OLTs and ONUs. In addition, the designs and implementations of MW-PON OLT and ONU are outside the scope of this Recommendation. Also note that this Recommendation recognizes ODN architectures wit
25、h multiple stages. Each stage can be a different type of ODN configuration depending on the chosen technology. 2 Rec. ITU-T G.9802 (2015)/Amd.1 (08/2015) 4) Annex B Add the following annex as Annex B: Annex B Multiple wavelength PONs with WM-based ODN (This annex forms an integral part of this Recom
26、mendation.) B.1 Reference architecture Figure B.1 depicts the functional optical access network architecture and reference points that apply to an MW-PON system with WM-based ODN. The ODN consists of the WM for the multiplexing/demultiplexing of the point-to-point WDM PON (PtP WDM) channels and, opt
27、ionally, reach extenders may also be used in the ODN. Wavelength signals from multiple OLT CTs are multiplexed by a WM at the SR-CG reference point. The WM at ODN directs different wavelength signals to different distribution fibres. Each ONU is served by a dedicated pair of downstream and upstream
28、wavelengths. There is no wavelength sharing among ONUs. Figure B.1 Reference configuration of MW-PON with WM-based ODN (WM only) Figures B.2 and B.3 depict MW-PON systems with ODNs consisting of one power splitter and two WMs. The ODN may optionally use reach extenders. In Figure B.2, the first WM i
29、s marked as WM1. WM1 is used for the Multiplexing/Demultiplexing of legacy system and PtP WDM channels. The second WM is marked as WM2, and is for the multiplexing/demultiplexing of PtP WDM channels. In Figure B.3, the power splitter forms the first stage of ODN. WMs are used as the second stage for
30、 the multiplexing/demultiplexing of PtP WDM channels. Configurations in Figures B.2 and B.3 support PtP WDM system coexistence with legacy systems. Rec. ITU-T G.9802 (2015)/Amd.1 (08/2015) 3 Figure B.2 Reference configuration of MW-PON with WM-based ODN (WM then power splitter) Figure B.3 - Referenc
31、e configuration of MW-PON with WM-based ODN (power splitter then WM) Figure B.4 depicts an MW-PON system with an ODN consisting of a WM and a reflector unit. The WM is used for the multiplexing/demultiplexing of PtP WDM channels. The reflector unit is marked as PRu. It is transparent for downstream
32、wavelength signals and partially reflective for upstream wavelength signals. The reflector unit is employed for the reference of upstream wavelength initialization and alignment of PtP WDM channels. This type of partially reflective unit can also be employed at the common port of WMs in Figures B.2
33、and B.3, for the same purpose of wavelength initialization and channel alignment. 4 Rec. ITU-T G.9802 (2015)/Amd.1 (08/2015) Figure B.4 Reference configuration of WM-based ODN with reflector unit B.2 Wavelength assignment In an MW-PON system with WM-based ODN, the ONU downstream and upstream wavelen
34、gths are assigned by the WM design. Wavelength assignment via protocol transmission is not required. B.3 Wavelength tuning In an MW-PON system with WM-based ODN, wavelength tuning may apply in ONU activation. During ONU activation, the OLT CTs would announce the wavelength channel pair information i
35、n the downstream management channel. Only one set of downstream and upstream wavelengths are directed and available for an ONU. A new ONU would first achieve downstream synchronization. An ONU with a tunable receiver scans available downstream wavelength channels to achieve downstream synchronizatio
36、n. An ONU without a tunable receiver synchronizes to the downstream wavelength channel configured by the WM in the ODN by skipping the downstream wavelength scanning. The ONU obtains its channel pair information from the downstream management channel. It tunes the upstream wavelength as the OLT CT i
37、nstructs. After the upstream transmission is successfully established, the ONU and the OLT CT enters normal operation. Note that there are several options to support the management channel. Annex B of ITU-T G.989.2 specifies transparent AMCC, which employs an auxiliary signal to transport the manage
38、ment information. Annex G of ITU-T G.989.3 specifies transcoding AMCC, which embeds management information into user data by improving user data coding efficiency. Wavelength tuning is not required after an ONU is activated for operation. B.4 Wavelength resource administration In an MW-PON system wi
39、th WM-based ODN, a logic ID representing the association of downstream and upstream wavelength channels is helpful in ONU activation. An ONU could obtain its assigned upstream wavelength channel information from the downstream management frames. B.5 Wavelength channel performance supervision In an M
40、W-PON system with WM-based ODN, the WM directs wavelengths to their optical paths and provides isolation among wavelength channels. This facilitates failure detection and performance supervision by monitoring the corresponding wavelengths. Printed in Switzerland Geneva, 2016 SERIES OF ITU-T RECOMMEN
41、DATIONS 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 Ser
42、ies 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 Environment and ICTs, climate change, e-waste, energy efficienc
43、y; construction, installation and protection of cables and other 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 equipm
44、ent 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 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
