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 (04/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks Optical line systems for local and access networks Multiple-wavelength
2、passive optical networks (MW-PONs) Recommendation ITU-T G.9802 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 ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.29
3、9 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 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHO
4、NY 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 USER-RELATED ASPECTS G.1000G.1999 TRANSMISS
5、ION 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.9899 In premises networks G.9900G.9999 For
6、further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.9802 (04/2015) i Recommendation ITU-T G.9802 Multiple-wavelength passive optical networks (MW-PONs) Summary Recommendation ITU-T G.9802 describes the general requirements and architecture of multiple-wavelength passive
7、optical network (PON) systems. It specifies the mechanism of wavelength assignment, wavelength tuning and wavelength maintenance in multiple-wavelength PON systems. The functionalities of wavelength resource management and wavelength channel performance monitoring and supervision are also included w
8、ithin the scope of this Recommendation. The specifications in this Recommendation can be applied to various types of multiple-wavelength PON systems. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.9802 2015-04-06 15 11.1002/1000/12398 _ * To access the Recommendation, typ
9、e 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 (04/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agen
10、cy 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 responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view
11、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 ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendatio
12、ns 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 collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for concisenes
13、s to indicate both a telecommunication administration and 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
14、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. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTEL
15、LECTUAL 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 takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whe
16、ther 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 property, protected by patents, which may be required to implement this Recommendation. However, implementers are c
17、autioned 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 part of this publication may be reproduced, by any means whatsoever, without the prior written permission
18、of ITU. Rec. ITU-T G.9802 (04/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Multiple-wavelength PON architecture 3 6.1 Network architecture 3 6.
19、2 Reference configuration . 4 7 General requirements on multiple-wavelength PON systems 12 8 Specifications for multiple-wavelength PON systems . 13 8.1 Wavelength assignment 13 8.2 Wavelength tuning 14 8.3 Wavelength resource administration 16 8.4 Wavelength channel performance supervision . 16 Ann
20、ex A Multiple-wavelength XG-PON enhancement . 17 A.1 Wavelength assignment 17 A.2 Wavelength tuning 17 A.3 Wavelength resource administration 17 A.4 Wavelength channel performance supervision . 17 Appendix I Multiple-wavelength 10G-EPON enhancement 18 I.1 Wavelength assignment 18 I.2 Wavelength tuni
21、ng 18 I.3 Wavelength resource administration 18 I.4 Wavelength channel performance supervision . 19 Rec. ITU-T G.9802 (04/2015) 1 Recommendation ITU-T G.9802 Multiple-wavelength passive optical networks (MW-PONs) 1 Scope This Recommendation describes the general requirements and architecture of mult
22、iple-wavelength passive optical network (PON) systems. It specifies the mechanism of wavelength assignment, wavelength tuning and wavelength maintenance in multiple-wavelength PON systems. The functionalities of wavelength resource management and wavelength channel performance monitoring and supervi
23、sion are also included within the scope of this Recommendation. The specifications in this Recommendation can be applied to various types of multiple-wavelength PON systems such as: a stack of several TDM PON systems in a single ODN, realized by assigning different wavelengths to each TDM PON system
24、, where wavelength tunable devices may be employed in the transceivers, a TDM PON enhanced by dynamic or semi-dynamic wavelength tuning to allow traffic load balancing, selective OLT-port sleep, etc., a WDM PON in which ONUs do not share wavelengths for offering logical point to point connectivity,
25、a hybrid scheme that combines these or other options. This Recommendation considers the following three classes as the tunability of ONU: fixed, electrically controlled and optically controlled. This Recommendation considers the following three classes as the wavelength tuning speed: slow ( 25 ms to
26、 1 s), middle (10 s to 25 ms), fast ( 10 s). This Recommendation includes specification of the functions necessary: to initiate the ONU discovery process, and recognize new ONUs on the PON and their tunability in a way that does not disrupt existing traffic, to assign a newly recognized ONU to an in
27、itial operating wavelength set, both upstream and downstream, to reassign an ONUs operating wavelength set during operation. Not every OLT, nor every ONU, need to implement all of these functions. The annex and appendix of this Recommendation provide specific implementations of MW-PON technologies i
28、n several systems. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are
29、 subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a docu
30、ment within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 2 Rec. ITU-T G.9802 (04/2015) ITU-T G.984.2 Recommendation ITU-T G.984.2 (2003), Gigabit-capable Passive Optical Networks (G-PON): Physical Media Dependent (PMD) layer specification. ITU-T G.
31、987 Recommendation ITU-T G.987 (2010), 10-Gigabit-capable passive optical network (XG PON) systems: Definitions, abbreviations and acronyms. ITU-T G.989.3 Recommendation ITU-T G.989.3 (2015), 40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification. 3 Defin
32、itions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined in ITU-T G.987: 3.1.1 optical distribution network (ODN): A point-to-multipoint optical fibre infrastructure. A simple ODN is entirely passive and is represented by a single-rooted point-to-multipoint tree of opt
33、ical fibres with splitters, combiners, filters, and possibly other passive optical components. A composite ODN consists of two or more passive segments interconnected by active devices, each of the segments being either an optical trunk line segment or an optical distribution segment. A passive opti
34、cal distribution segment is a simple ODN itself. Two ODNs with distinct roots can share a common subtree. 3.1.2 optical line termination (OLT): A network element in an ODN-based optical access network that terminates the root of at least one ODN and provides an OAN SNI. 3.1.3 optical network unit (O
35、NU): A network element in an ODN-based optical access network that terminates a leaf of the ODN and provides an OAN UNI. 3.1.4 passive optical network (PON) system: A combination of network elements in an ODN-based optical access network that includes an OLT and multiple ONUs and implements a partic
36、ular coordinated suite of physical medium dependent layer, transmission convergence layer, and management protocols. 3.2 Terms defined in this Recommendation This Recommendation defines the following term: 3.2.1 OLT port: Each of the physical ports in the optical line terminal (OLT) that connects to
37、/from a fibre of the optical distribution network (ODN). 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: CT Channel Termination demux demultiplexer DWDM Dense Wavelength Division Multiplexing EPON Ethernet Passive Optical Network LLID Logical Link IDen
38、tifier MAC Media Access Control mux multiplexer MPCP Multi-Point Control Protocol MW Multiple Wavelength Rec. ITU-T G.9802 (04/2015) 3 ODN Optical Distribution Network OLT Optical Line Terminal OMCC ONU Management and Control Channel ONU Optical Network Unit PLOAM Physical Layer Operation, Administr
39、ation and Maintenance PON Passive Optical Network PS Power Splitter R/S R/S Reference point Rx Receiver SNI Service Node Interface S/R S/R Reference point TDM Time Division Multiplexing TWDM Time and Wavelength Division Multiplexing Tx Transmitter UNI User-Network Interface WC WDM Coupler WDM Wavele
40、ngth Division Multiplexing WM Wavelength Multiplexer 5 Conventions This Recommendation uses conventions defined in ITU-T G.987. 6 Multiple-wavelength PON architecture 6.1 Network architecture Figures 6-1 and 6-2 show an MW-PON architecture with a single OLT and multiple OLTs, respectively. The archi
41、tecture includes an OLT or OLTs, ONUs and an ODN between them. In the downstream direction, the OLT or OLTs transmit multiple-wavelength signals to the ONUs. The ODN distributes signals via a point-to-multipoint optical fibre infrastructure. Depending on the deployment scenario, the ODN could be sin
42、gle or multiple stages. In the upstream direction, an ONU transmits one of the upstream wavelength signals during its transmission time. The ODN combines multiple upstream wavelengths. The OLT or OLTs receive and process more than one upstream wavelength. 4 Rec. ITU-T G.9802 (04/2015) Figure 6-1 MW-
43、PON architecture with a single OLT Figure 6-2 MW-PON architecture with multiple OLTs 6.2 Reference configuration 6.2.1 ODN There can be several types of ODN architecture to achieve service distribution in MW-PONs. Figures 6-3 and 6-4 show examples of MW-PON with power-splitter-based ODN. Figures 6-5
44、 and 6-6 are examples of MW-PON with wavelength-mux (demux)-based ODN, where “mux“ denotes “multiplexer“. Figure 6-7 is an example of an MW-PON with an ODN consisting of power splitters and multiple feeder fibres. Figure 6-8 is an example of MW-PON with an ODN consisting of an NxM wavelength mux (de
45、mux) and multiple power splitters. Figure 6-9 is a reference diagram of an MW-PON with Type C protection 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 an MW-PON with
46、wavelength muxs (demuxs) at the OLT and at the ODN. Note that Figures 6-3 to 6-11 simply provide reference 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 th
47、e scope of this Recommendation. Also note that this Recommendation recognizes ODN architectures with multiple stages. Each stage can be a different type of ODN configuration depending on the chosen technology. Rec. ITU-T G.9802 (04/2015) 5 Figure 6-3 Configuration example of MW-PON with a 1xM power
48、splitter at the OLT and 1xN power splitters at the ODN 6 Rec. ITU-T G.9802 (04/2015) Figure 6-4 Configuration example of MW-PON with an 1xM wavelength mux (demux) at the OLT and 1xN power splitters at the ODN Rec. ITU-T G.9802 (04/2015) 7 Figure 6-5 Configuration example of MW-PON with an 1xN power
49、splitter at the OLT and a 1xN wavelength mux (demux) at the ODN 8 Rec. ITU-T G.9802 (04/2015) Figure 6-6 Configuration example of MW-PON with an 1xM wavelength mux (demux) at the OLT and an 1xN wavelength mux (demux) at the ODN Rec. ITU-T G.9802 (04/2015) 9 Figure 6-7 Configuration example of MW-PON with an NxM wavelength mux (demux) at the OLT and 1xN power splitters at the ODN 10 Rec. ITU-T G.9802 (04/2015) Figure 6-8 Configuration example of MW-PON with an 1xM wavelength
