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.989.2 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2014) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access net
2、works 40-Gigabit-capable passive optical networks 2 (NG-PON2): Physical media dependent (PMD) layer specification Recommendation ITU-T G.989.2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENER
3、AL 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 SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTIO
4、N 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 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 General G.900G.909 Pa
5、rameters for optical fibre cable systems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line systems provided by FDM transmission bearers G.940G.949 Digita
6、l line systems G.950G.959 Digital section and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Metallic access networks G.990G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFO
7、RMANCE 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 details, please refer to the list of ITU-T Recommendations. Rec. I
8、TU-T G.989.2 (12/2014) i Recommendation ITU-T G.989.2 40-Gigabit-capable passive optical networks 2 (NG-PON2): Physical media dependent (PMD) layer specification Summary Recommendation ITU-T G.989.2 specifies the physical media dependent (PMD) layer requirements for a passive optical network (PON) s
9、ystem with a nominal aggregate capacity of 40 Gbit/s in the downstream direction and 10 Gbit/s in the upstream direction, hereinafter referred to as NG-PON2. NG-PON2 is a flexible optical fibre access network capable of supporting the bandwidth requirements of mobile backhaul, business and residenti
10、al services. Furthermore, this Recommendation describes optional configurations, to extend beyond this nominal capacity, as the ITU-T G.989 series of Recommendations allows for multiple upstream and downstream line rates. The NG-PON2 wavelength plan is defined to enable the coexistence through wavel
11、ength overlay with legacy PON systems (see ITU-T G.989.1). The transmission convergence (TC) layer is based on Recommendation ITU-T G.987.3, with unique modifications for NG-PON2 captured in Recommendation ITU-T G.989.3. The optical network unit (ONU) management and control interface (OMCI) specific
12、ations are described in Recommendation ITU-T G.988 for NG-PON2 extensions. This Recommendation specifies the characteristics of hybrid time and wavelength division multiplexing (TWDM) channels, referred to as TWDM PON. The characteristics of optional, tunable point-to-point wavelength overlay channe
13、ls are also described, referred to as point-to-point wavelength division multiplexing (PtP WDM) PON. The TWDM PON described in this Recommendation represents a further development from the systems described in the ITU-T G.984 and ITU-T G.987 series of Recommendations. To the greatest extent possible
14、, this Recommendation retains the requirements of ITU-T G.984.1 and ITU-T G.987.1 to ensure maximal reuse of existing technology and compatibility with deployed optical access systems and optical fibre infrastructure. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.989.2 2
15、014-12-05 15 11.1002/1000/12097 _ * 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.989.2 (12/2014) FOREWORD The Internationa
16、l 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 responsible for studying technical, operating
17、 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 ITU-T study groups which, in turn, produc
18、e 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 collaborative basis with ISO and IEC. NOTE In this
19、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 mandatory provisions (to ensure, e.g., inte
20、roperability 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. The use of such words does not suggest t
21、hat 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 takes no position concerning the evidence,
22、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, protected by patents, which may be requ
23、ired 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 part of this publication may be reproduc
24、ed, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.989.2 (12/2014) 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: Optical access architecture 3 3.3 Terms defined in th
25、is Recommendation: Optical parameters, power and loss budgets 5 4 Abbreviations and acronyms 8 5 Conventions 10 5.1 Optical access concepts 10 5.2 Multi-wavelength PON system reference points 10 5.3 Power and loss budget parameters . 11 5.4 Dynamic range, sensitivity and overload . 11 5.5 Sensitivit
26、y and overload in the presence of forward error correction (FEC) 12 5.6 Reach and distance . 12 5.7 Use of the term passive optical network (PON) . 12 5.8 Use of the term optical distribution network (ODN) 12 5.9 Use of the terms optical network unit (ONU) and optical network termination (ONT) 12 5.
27、10 Use of the terms T-CONT and Alloc-ID 12 5.11 Use of the terms bandwidth assignment and bandwidth allocation . 12 5.12 Use of the terms band and range 13 5.13 Transmitter enable control and associated transient times . 13 6 Architecture of the optical access network . 13 6.1 Physical grouping of l
28、ogical functions . 15 6.2 ODN optical path loss classes 15 6.3 Fibre distance classes . 15 7 Services . 15 8 User network interface and service node interface . 15 9 Common optical network requirements 16 9.1 Layered structure of optical network 16 9.2 Wavelength plans for NG-PON2 16 9.3 Physical me
29、dia dependent layer requirements . 16 10 Crosstalk-to-signal ratio tolerance for NG-PON2 20 10.1 Wideband X/S tolerance mask definition . 21 10.2 Narrowband TWDM PON X/S tolerance mask . 21 11 TWDM PON PMD layer requirements 24 iv Rec. ITU-T G.989.2 (12/2014) Page 11.1 PMD layer requirements . 24 11
30、.2 Upstream physical layer overhead 43 Annex A Tunable PtP WDM PON PMD layer requirements . 44 A.1 PMD layer requirements . 45 Annex B Auxiliary management and control channel 62 Appendix I Wavelength considerations for NG-PON2, XG-PON1, G-PON and RF video overlay distribution services . 63 Appendix
31、 II Physical layer measurements required to support optical layer supervision 64 Appendix III Allocation of the physical layer overhead time . 67 Appendix IV Jitter budget specifications for TWDM PON . 70 Appendix V Measurement of TWDM PON burst mode acquisition time and burst node eye opening at OL
32、T 71 Appendix VI Nonlinear Raman interactions in optical fibres and mitigation technologies for coexistence of multiple PONs 72 Appendix VII Cyclic AWG channel grid design examples 77 VII.1 Example AWG channel grid for 8-skip-0 at 100 GHz channel spacing 77 VII.2 Example AWG channel grid for 4-skip-
33、0 at 100 GHz channel spacing 78 VII.3 Example AWG channel grid for 8-skip-0 at 50 GHz channel spacing 79 VII.4 Example AWG channel grid for 4-skip-0 at 50 GHz channel spacing 81 Appendix VIII Wavelength multiplexer, upstream inter-channel crosstalk, ONU transmitter tuning time considerations, and up
34、stream channel grid example . 84 VIII.1 Wavelength multiplexer . 84 VIII.2 Upstream inter-channel crosstalk . 86 VIII.3 ONU transmitter tuning time 90 VIII.4 TWDM PON upstream channel grid example . 92 Appendix IX Alternative line code for Raman mitigation 93 IX.1 8B10B Scheme . 93 IX.2 Miller users
35、 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 document within this Recommenda
36、tion does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.652 Recommendation ITU-T G.652 (2009), Characteristics of a single-mode optical fibre and cable. ITU-T G.657 Recommendation ITU-T G.657 (2009), Characteristics of a bending-loss insensitive single-mode optical
37、fibre and cable for the access network. ITU-T G.671 Recommendation ITU-T G.671 (2012), Transmission characteristics of optical components and subsystems. ITU-T G.694.1 Recommendation ITU-T G.694.1 (2002), Spectral grids for WDM applications: DWDM frequency grid. ITU-T G.698.1 Recommendation ITU-T G.
38、698.1 (2009), Multichannel DWDM applications with single-channel optical interfaces. ITU-T G.698.3 Recommendation ITU-T G.698.3 (2012), Multichannel seeded DWDM applications with single-channel optical interfaces. ITU-T G.707 Recommendation ITU-T G.707/Y.1322 (2009), Network node interface for the s
39、ynchronous digital hierarchy (SDH). ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2012), Interfaces for the optical transport network. 2 Rec. ITU-T G.989.2 (12/2014) ITU-T G.783 Recommendation ITU-T G.783 (2006), Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks. IT
40、U-T G.825 Recommendation ITU-T G.825 (2000), The control of jitter and wander within digital networks which are based on the synchronous digital hierarchy (SDH). ITU-T G.957 Recommendation ITU-T G.957 (2006), Optical interfaces for equipments and systems relating to the synchronous digital hierarchy
41、. ITU-T G.959.1 Recommendation ITU-T G.959.1 (2009), Optical transport network physical layer interfaces. ITU-T G.982 Recommendation ITU-T G.982 (1996), Optical access networks to support services up to the ISDN primary rate or equivalent bit rates. ITU-T G.983.1 Recommendation ITU-T G.983.1 (2005),
42、 Broadband optical access systems based on Passive Optical Networks (PON). ITU-T G.984.1 Recommendation ITU-T G.984.1 (2008), Gigabit-capable passive optical networks (GPON): General characteristics. ITU-T G.984.2 Recommendation ITU-T G.984.2 (2003), Gigabit-capable Passive Optical Networks (G-PON):
43、 Physical Media Dependent (PMD) layer specification. ITU-T G.984.5 Recommendation ITU-T G.984.5 (2007), Gigabit-capable passive optical networks (G-PON): Enhancement band. ITU-T G.987 Recommendation ITU-T G.987 (2010), 10-Gigabit-capable passive optical network (XG-PON) systems: Definitions, abbrevi
44、ations and acronyms. ITU-T G.987.1 Recommendation ITU-T G.987.1 (2010), 10 Gigabit-capable passive optical networks (XG-PON): General requirements. ITU-T G.987.2 Recommendation ITU-T G.987.2 (2010), 10-Gigabit-capable passive optical networks (XG-PON): Physical media dependent (PMD) layer specificat
45、ion. ITU-T G.987.3 Recommendation ITU-T G.987.3 (2010), 10-Gigabit-capable passive optical networks (XG-PON): Transmission convergence (TC) layer specification. ITU-T G.988 Recommendation ITU-T G.988 (2010), ONU management and control interface (OMCI) specification. ITU-T G.989.1 Recommendation ITU-
46、T G.989.1 (2013), 40-Gigabit-capable passive optical networks (NG-PON2): General requirements. ITU-T J.185 Recommendation ITU-T J.185 (2012), Transmission equipment for transferring multi-channel television signals over optical access networks by frequency modulation conversion. ITU-T J.186 Recommen
47、dation ITU-T J.186 (2008), Transmission equipment for multi-channel television signals over optical access networks by sub-carrier multiplexing (SCM). ITU-T L.66 Recommendation ITU-T L.66 (2007), Optical fibre cable maintenance criteria for in-service fibre testing in access networks. 3 Definitions
48、3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: Rec. ITU-T G.989.2 (12/2014) 3 3.1.1 access network b-ITU-T G.902: An implementation comprising those entities (such as cable plant, transmission facilities, etc.) which provide the required transport bearer
49、capabilities for the provision of telecommunications services between a service node interface (SNI) and each of the associated user-network interfaces (UNI). 3.1.2 Ethernet LAN service (E-LAN) b-MEF6.1: An Ethernet service type that is based on a Multipoint-to-Multipoint Ethernet virtual connection. 3.1.3 Ethernet line service (E-Line) b-MEF6.1: An Ethernet service type that is based on a point-to-point Ethernet virtual connec
