1、 International Telecommunication Union ITU-T G.989.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access networks 40-Gigabit-capable passive
2、optical networks (NG-PON2): General requirements Recommendation ITU-T G.989.1 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 ANALOGUE CARRIER-TRANSMISSION SY
3、STEMS 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 COORDINATION OF RADIOTELEPHONY A
4、ND 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 Parameters for optical fibre cable systems G.910G.919 Digital secti
5、ons 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 Digital line systems G.950G.959 Digital section and digital transmissio
6、n 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.989Access networks G.990G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHA
7、RACTERISTICS 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.989.1 (03/2013) i Recommendation ITU-T G.989.1 40-Gigabit-capable pa
8、ssive optical networks (NG-PON2): General requirements Summary Recommendation ITU-T G.989 series describes 40-Gigabit-capable passive optical network (NG-PON2) systems in an optical access network for residential, business, mobile backhaul and other applications. Recommendation ITU-T G.989.1 address
9、es the general requirements of 40-Gigabit-capable passive optical network (NG-PON2) systems, in order to guide and motivate the physical layer and the transmission convergence layer specifications. This Recommendation includes principal deployment configurations, migration scenarios from legacy PON
10、systems, and system requirements This Recommendation also includes the service and operational requirements to provide a robust and flexible optical access network supporting all access applications. The physical layer specifications for the NG-PON2 physical media dependent (PMD) layer are described
11、 in Recommendation ITU-T G.989.2. The transmission convergence (TC) layer is described in Recommendation ITU-T G.987.3, with unique modifications for NG-PON2 systems captured in Recommendation ITU-T G.989.3. The ONU management and control interface (OMCI) specifications are described in Recommendati
12、on ITU-T G.988 for NG-PON2 extensions. History Edition Recommendation Approval Study Group 1.0 ITU-T G.989.1 2013-03-09 15 ii Rec. ITU-T G.989.1 (03/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information
13、 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 to standardizing telecommunications on a worldwide
14、 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 Recommendations is covered by the procedure laid down in WTSA R
15、esolution 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 administrat
16、ion 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 is achieved when all of these mandatory provisions
17、 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. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the
18、 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, whether asserted by ITU members or others outside of
19、 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 required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest infor
20、mation and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 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.989.1 (03/2013) iii Table of Con
21、tents Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 NG-PON2 specific terms 2 4 Abbreviations and acronyms 3 5 Architecture 4 5.1 System overview 4 5.2 Network reference architecture 4 6 Migration 5 6.1 Co-existence, stacking and overlay 6 6.2 Migration path options . 8 6.3 Support for legacy OD
22、N . 8 7 Service requirements 9 7.1 Service specific requirements . 9 7.2 User node interfaces (UNIs) . 9 7.3 Service node interfaces (SNIs) . 10 7.4 Access node interfaces (ANIs) . 11 7.5 System flexibility 11 8 Physical layer requirements 11 8.1 Capacity (per feeder and per user) 11 8.2 Fibre reach
23、 (passive and active) . 12 8.3 Split ratio (ONUs per ODN) . 12 8.4 Optical spectrum issues and availability 13 9 System requirements . 14 9.1 Colourless ONUs 14 9.2 Spectral flexibility 14 9.3 Rogue ONU/OLT detection and mitigation . 14 9.4 Resilience and redundancy requirements . 14 9.5 Reach exten
24、der requirements . 15 9.6 Power reduction 15 9.7 OAM functions . 16 9.8 Provisioning and management . 16 9.9 Environmental and physical requirements . 16 9.10 Eye safety . 16 9.11 Interoperability . 17 Bibliography. 18 Rec. ITU-T G.989.1 (03/2013) 1 Recommendation ITU-T G.989.1 40-Gigabit-capable pa
25、ssive optical networks (NG-PON2): General requirements 1 Scope This Recommendation describes the general requirements of NG-PON2 systems supporting a 40-Gbit/s capable aggregate downstream capacity for residential, business, mobile backhaul, and other applications. This Recommendation includes the p
26、rincipal deployment configurations, migration scenarios from legacy PON systems, and system requirements. This Recommendation also includes the service and operational requirements to provide for a robust and flexible optical access network supporting all access applications. The NG-PON2 system is c
27、apable of meeting the needs of a wide range of networks in diverse markets and is deployable in numerous applications in an efficient manner. As much as possible, this Recommendation maintains characteristics from legacy PON systems: ITU-T G.982, ITU-T G.983, ITU-T G.984, and ITU-T G.987 series of R
28、ecommendations. This is to promote backward compatibility with existing optical distribution networks (ODNs) that comply with those Recommendations and re-use established technical capabilities as much as possible. This Recommendation also describes smooth migration scenarios from legacy PON systems
29、 to NG-PON2 systems. Furthermore, NG-PON2 systems are is expected to meet bandwidth growth and enable new revenue streams on legacy ODNs as well as supporting greenfield applications over new ODNs. 2 References The following ITU-T Recommendations and other references contain provisions which, throug
30、h 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 subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying th
31、e 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 Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.652
32、Recommendation ITU-T G.652 (2005), Characteristics of a single-mode optical fibre cable. ITU-T G.902 Recommendation ITU-T G.902 (1995), Framework Recommendation on functional access networks (AN) Architecture and functions, access types, management and service node aspects. ITU-T G.982 Recommendatio
33、n 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), Broadband optical access systems based on Passive Optical Networks (PON). ITU-T G.983.2 Recommendation ITU-T G.983.2 (2005), ONT m
34、anagement and control interface specification for B-PON. ITU-T G.983.3 Recommendation ITU-T G.983.3 (2001), A broadband optical access system with increased service capability by wavelength allocation. ITU-T G.984.1 Recommendation ITU-T G.984.1 (2008), Gigabit-capable Passive Optical Networks (GPON)
35、: General characteristics. 2 Rec. ITU-T G.989.1 (03/2013) ITU-T G.984.2 Recommendation ITU-T G.984.2 (2008), Gigabit-capable Passive Optical Networks (GPON): Physical Media Dependent (PMD) layer specifications. ITU-T G.984.3 Recommendation ITU-T G.984.3 (2008), Gigabit-capable Passive Optical Networ
36、ks (GPON): Transmission convergence layer specification. ITU-T G.984.4 Recommendation ITU-T G.984.4 (2008), Gigabit-capable Passive Optical Networks (GPON): ONT management and control interface specification. ITU-T G.984.5 Recommendation ITU-T G.984.5 (2007), Gigabit-capable Passive Optical Networks
37、 (GPON): Enhancement band for Gigabit-capable Passive Optical Networks. ITU-T G.987 Recommendation ITU-T G.987 (2012), 10-Gigabit-capable Passive Optical Networks (XG-PON) systems: Definitions, abbreviations and acronyms. ITU-T G.987.1 Recommendation ITU-T G.987.1 (2010), 10-Gigabit-capable Passive
38、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 specification. ITU-T G.987.3 Recommendation ITU-T G.987.3 (2010), 10-Gigabit-capable Passive Optical Networks
39、 (XG-PON): Transmission convergence (TC) layer specification. ITU-T G.988 Recommendation ITU-T G.988 (2010), ONU management and control interface specification (OMCI). ITU-T J.185 Recommendation ITU-T J.185 (2012), Transmission equipment for transferring multi-channel television signals over optical
40、 access networks by frequency modulation conversion. ITU-T J.186 Recommendation ITU-T J.186 (2008), Transmission equipment for multi-channel television signals over optical access networks by sub-carrier multiplexing (SCM). IEC 60825-2 IEC International Standard 60825-2 (2004), Safety of laser produ
41、cts Part 2: Safety of optical fibre communication systems (OFCS). IEEE 802.3 IEEE 802.3-2012, IEEE Standard for Information Technology Telecommunications and Information exchange between systems Local and metropolitan area networks Specific requirements, Part 3: Ethernet. 3 Definitions See clause 3
42、of ITU-T G.987. 3.1 NG-PON2 specific terms This Recommendation uses the following NG-PON2 specific definitions: 3.1.1 TWDM PON: A time and wavelength division multiplexing passive optical network (TWDM PON) is a multiple wavelength PON solution in which each wavelength is shared between multiple opt
43、ical network units (ONUs) by employing time division multiplexing and multiple access mechanisms. 3.1.2 PtP WDM: Point-to-point wavelength division multiplexing (PtP WDM) is a multiple wavelength PON solution that provides a dedicated wavelength per ONU in both downstream and upstream directions. Th
44、e defining characteristic of a PtP WDM is that each ONU is served by one or more dedicated wavelengths. Rec. ITU-T G.989.1 (03/2013) 3 4 Abbreviations and acronyms This Recommendation uses the following NG-PON2 specific abbreviations and acronyms: ANI Access Node Interface APC Angled Physical Contac
45、t BBU Baseband Unit CD Chromatic Dispersion CE Coexistence Element CPRI Common Public Radio Interface eNode B Evolved Node Base station FTTx Fibre to the x (B building, business; H home; C cabinet, curb) G-PON Gigabit-capable Passive Optical Network, ITU-T G.984.x. Unless explicitly stated otherwise
46、, this term also refers generically to ITU-T G.987 XG-PON. LTE Long Term Evolution MDU/SFU Multi-Dwelling Unit/Single-Family Unit ODN Optical Distribution Network ODS Optical Distribution Segment OLT Optical Line Terminal ONU Optical Network Unit PON Passive Optical Network PtP WDM Point-to-Point Wa
47、velength Division Multiplexing QoS Quality of Service RE Reach Extender RF Radio Frequency RRU Remote Radio Unit R/S Reach extender interface to optical trunk line ITU-T G.988 SMF Single Mode Fibre S/R Reach extender interface to optical distribution network ITU-T G.988 TC Transmission Convergence T
48、WDM Time and Wavelength Division Multiplexing UNI User Node Interface UPC Ultra Physical Contact WDM Wavelength Division Multiplexing XG-PON 10-Gigabit Passive Optical Network ITU-T G.987 4 Rec. ITU-T G.989.1 (03/2013) 5 Architecture 5.1 System overview The following provides an overview of NG-PON2
49、system requirements. Additional requirement details are provided in specific sections within this Recommendation. NG-PON2 systems requirements include support for: Multiple wavelength channel TWDM architecture 4-8 TWDM channel pairs (each channel pair comprising one downstream and one upstream wavelength channel), configurable for incremental growth starting from one deployed channel pair (i.e., not all channel pairs need to be active); for example,
