1、 International Telecommunication Union ITU-T G.9801TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks Optical line systems for local and access networks Ethernet passive optical networks using OMCI Recommen
2、dation ITU-T G.9801 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.299 INDIVIDUAL CHARACTERISTICS OF INTERNATION
3、AL 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 TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICA
4、L 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 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA
5、 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.9899In premises networks G.9900G.9999 For further details, please refer to the list of
6、 ITU-T Recommendations. Rec. ITU-T G.9801 (08/2013) i Recommendation ITU-T G.9801 Ethernet passive optical networks using OMCI Summary Recommendation ITU-T G.9801 describes requirements and specifications of Ethernet passive optical network (EPON) systems using the ONU management and control interfa
7、ce (OMCI), which is called OMCI-EPON. OMCI-EPON is based on IEEE 802.3 and IEEE 1904.1 for user data transport, and applies Annex C of Recommendation ITU-T G.988 for its management. OMCI-EPON supports 1G-EPON, 10/1G-EPON and 10/10G-EPON architectures defined in IEEE 802.3, and provides a mechanism t
8、hat enables coexistence with the existing PON systems using time division multiple access (TDMA) technologies and/or wavelength blocking filter (WBF). History Edition Recommendation Approval Study Group Unique ID*1.0 ITU-T G.9801 2013-08-29 15 11.1002/1000/12009-en _ *To access the Recommendation, t
9、ype 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.9801 (08/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized ag
10、ency 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 vie
11、w 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 Recommendat
12、ions 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 concisen
13、ess 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 Recommendatio
14、n 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. INT
15、ELLECTUAL PROPERTY RIGHTS ITU 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,
16、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 property, protected by patents, which may be required to implement this Recommendation. However, implementers ar
17、e 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 2014 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permissi
18、on of ITU. Rec. ITU-T G.9801 (08/2013) 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 5 5 Conventions 6 6 Architecture of the optical access network . 8 6.1 Network architect
19、ure 8 6.2 Reference architecture 8 6.3 ODN architectures 9 7 Scenarios and services 11 7.1 Scenarios . 11 7.2 Services . 12 7.3 Maximum/Mean signal transfer delay tolerance 12 7.4 Frame length . 12 7.5 Synchronization features and quality . 12 7.6 QoS and traffic management 13 8 Requirements 13 8.1
20、Physical layer and MAC layer requirements 13 8.2 System level requirements 14 8.3 Operational requirements . 14 8.4 Resilience and protection on ODN . 15 9 Optical network requirements. 15 9.1 Physical medium dependent (PMD) sublayer 15 9.2 Media access control (MAC), extensions of the reconciliatio
21、n sublayer (RS) and physical coding sublayer (PCS)/physical media attachment (PMA) . 15 9.3 OMCI-EPON management 17 Bibliography. 18 Rec. ITU-T G.9801 (08/2013) 1 Recommendation ITU-T G.9801 Ethernet passive optical networks using OMCI 1 Scope The Ethernet passive optical network (EPON) system is a
22、general name for PON systems that are based on the IEEE 802.3 standard and the IEEE 1904.1 standard. This Recommendation focuses on EPON systems that apply the ONU management and control interface (OMCI) defined by ITU-T G.988 to create an effective PON operation system. This Recommendation calls th
23、ese EPON systems OMCI-EPON. OMCI-EPON includes 1G-EPON, 10/1G-EPON and 10/10G-EPON architectures defined in IEEE 802.3. The requirements and specifications of OMCI-EPON conform to IEEE 802.3 and the IEEE 1904.1 Package B standard and to the operational requirements and specifications defined by Anne
24、x C of ITU-T G.988. The requirements and specifications of OMCI-EPON enable the use of OMCI to manage IEEE 802.3/IEEE 1904.1 Package B compliant systems, thus providing 1G-EPON and 10G-EPON solutions to network operators who prefer OMCI management. As much as possible, this Recommendation maintains
25、backward compatibility with existing optical distribution networks (ODN) that comply with the existing PON systems defined by IEEE 802.3 and ITU-T Recommendations such as b-ITU-T G.983.x, b-ITU-T G.984.x and b-ITU-T G.987.x. Furthermore, this Recommendation provides a mechanism that enables coexiste
26、nce with the existing PON systems using TDMA technologies and/or wavelength blocking filter (WBF). 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,
27、 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 the most recent edition of the Recommendations and other references listed below. A list of the curre
28、ntly 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.902 Recommendation ITU-T G.902 (1995), Framework Recommendation on functional access networks (AN) Arch
29、itecture and functions, access types, management and service node aspects. ITU-T G.984.1 Recommendation ITU-T G.984.1 (2008), Gigabit-capable passive optical networks (GPON): General characteristics. ITU-T G.988 Recommendation ITU-T G.988 (2012), Optical network unit management and control interface
30、 specification. IEEE 1904.1 IEEE 1904.1-2013, IEEE Standard for Service Interoperability in Ethernet Passive Optical Networks (SIEPON). IEEE 802.3 IEEE 802.3-2012, IEEE Standard for Ethernet. 2 Rec. ITU-T G.9801 (08/2013) 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the followi
31、ng terms defined elsewhere: 3.1.1 access network (AN) ITU-T G.902: An implementation comprising those entities (such as cable plant, transmission facilities, etc.) which provide the required transport bearer capabilities for the provision of telecommunications services between a service node interfa
32、ce (SNI) and each of the associated user-network interfaces (UNI). 3.1.2 Ethernet LAN service (E-LAN) b-MEF 6.1: An Ethernet service type that is based on a multipoint-to-multipoint Ethernet virtual connection. 3.1.3 Ethernet line service (E-Line) b-MEF 6.1: An Ethernet service type that is based on
33、 a point-to-point Ethernet virtual connection. 3.1.4 Ethernet tree service (E-Tree) b-MEF 6.1: An Ethernet service type that is based on a rooted-multipoint Ethernet virtual connection. 3.1.5 Ethernet virtual connection (EVC) b-MEF 6.1: An association of UNIs to which the exchange of service frames
34、is limited. 3.1.6 service node (SN) ITU-T G.902: A network element that provides access to various switched and/or permanent telecommunication services. 3.1.7 service node interface (SNI) ITU-T G.902: An interface which provides customer access to a service node. 3.1.8 user-network interface (UNI) b
35、-ITU-T I.112: The interface between the terminal equipment and a network termination at which interface the access protocols apply. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: Terms related to optical access architecture 3.2.1 Ethernet passive optical ne
36、twork (EPON): A general name for PON systems that are based on the IEEE 802.3 standard and the IEEE 1904.1 standard. 3.2.2 OMCI-EPON: An EPON system that applies the ONU Management and Control Interface (OMCI) defined by ITU-T G.988. 3.2.3 optical access network (OAN): A part of an access network wh
37、ose network elements are interconnected by optical communication channels. NOTE An OAN may or may not extend all the way to the UNI, so that the user-side interface of the OAN does not necessarily coincide with the UNIs of the AN. 3.2.4 optical distribution network (ODN): A point-to-multipoint optic
38、al fibre infrastructure. A simple ODN is entirely passive and is represented by a single-rooted point-to-multipoint tree of optical fibres with splitters, combiners, filters, and possibly other passive optical components. A composite ODN consists of two or more passive segments interconnected by act
39、ive devices, each of the segments being either an optical trunk line segment or an optical distribution segment. A passive optical distribution segment is a simple ODN itself. Two ODNs with distinct roots can share a common subtree. 3.2.5 optical line termination (OLT): A network element in an ODN-b
40、ased optical access network that terminates the root of at least one ODN and provides an OAN SNI. 3.2.6 optical network terminal (ONT): An ONU supporting a single subscriber. Rec. ITU-T G.9801 (08/2013) 3 3.2.7 optical network unit (ONU): A network element in an ODN-based optical access network that
41、 terminates a leaf of the ODN and provides an OAN UNI. 3.2.8 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 particular coordinated suite of physical medium dependent layer, transmi
42、ssion convergence layer, and management protocols. Terms related to optical parameters, power and loss budget 3.2.9 attenuation: The total relative optical power loss of an optical signal propagating through the ODN. Attenuation is caused by absorption and scattering of light in the fibre (caused by
43、 fibre impurities and imperfections, fluctuations of the refractive index, material dispersion), as well as connectors, splices, splitters, wavelength couplers, attenuators, and other passive optical components. 3.2.10 differential fibre distance: The absolute difference between the fibre distances
44、of two particular ONUs connected to the same OLT PON interface. 3.2.11 dispersion: A physical phenomenon comprising the dependence of the phase or group velocity of a light wave in the medium on its propagation characteristics such as optical frequency (wavelength) or polarization mode. 3.2.12 dynam
45、ic range: An optical receiver characteristic that represents the difference between the worst-case sensitivity (i.e., maximum over the operating conditions) and the worst-case overload (i.e., minimum over the operating conditions), and is usually expressed as a ratio of the former to the latter. 3.2
46、.13 extinction ratio: With respect to a digital signal generated by an optical source (laser diode), the ratio of the two optical power levels corresponding to the high and low intensities of light emission. 3.2.14 fibre distance: The overall length of fibre (and, if applicable, equivalent fibre run
47、s representing delay-inducing components) between the R/S and S/R reference points. 3.2.15 mean optical launch power: An optical transmitter characteristic expressing the average optical power of an optical signal transmitted into the fibre and carrying a given digital sequence. When specified as a
48、range, the minimum mean launch power provides the power level that the transmitter should guarantee at all times, and the maximum mean launch power provides the power level that the transmitter should never exceed. When applied to burst mode transmission, the term pertains to the time interval durin
49、g which the transmitter is fully active, and excludes possible starting and ending transient behaviour. 3.2.16 nominal line rate: The total number of bits that can be physically transferred per unit of time over a communication link. Nominal line rate accounts for useful data as well as for all possible protocol overheads and necessarily exceeds the effective data rate on any given protocol level. 3.2.17 optical path penalty (OPP): The apparent reduction of receiver sensitivity
