1、 ETSI TS 102 973 V1.1.1 (2008-09)Technical Specification Access Terminals, Transmission and Multiplexing (ATTM);Network Termination (NT)in Next Generation Network architecturesETSI ETSI TS 102 973 V1.1.1 (2008-09) 2 Reference DTS/ATTM-02004 Keywords access, network ETSI 650 Route des Lucioles F-0692
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6、ing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2008. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI r
7、egistered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 102 973 V1.1.1 (2008-09) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 4 1 Scope 8 2 References 8 2.1 Normative references .8 2.2 Informative references9 3 Abbreviations .10 4 General re
8、quirements .11 4.1 Hardware and case characteristics11 4.2 Powering characteristic 12 4.3 Electrical and Mechanical Protection, Safety, EMC and Environmental Safety (Eco-Compatibility).13 5 WAN physical interfaces14 5.1 xDSL physical connector .14 5.2 ADSL2+ specific characteristics 14 5.3 VDSL2-onl
9、y specific characteristics15 5.4 VDSL2 and ADSL2+ specific characteristics 16 5.5 GPON-specific characteristics16 5.6 Point-to-point FTTH specific characteristics .17 6 WAN interfaces logical framing 18 6.1 L2 ATM features18 6.2 L2 Ethernet features .18 6.3 Performances19 7 LAN interfaces .19 7.1 Si
10、ngle LAN port .19 7.2 Multiple LAN ports19 8 IP functionalities 20 8.1 IP traffic generated inside the NT for communication with the network .20 8.2 IP traffic between LAN and WAN.20 9 LAN-WAN QoS functionalities.21 10 Security.22 11 Management.22 11.1 Remote physical layer monitoring capabilities.2
11、2 11.2 Local management and configuration 23 11.3 TCP/IP based remote management 24 11.4 Alternative management solution for Point-to-Point FTTH.25 11.5 Remote management in optical networks (GPON) 26 11.6 Physical alarms.26 12 Memory requirements related to firmware upgrade feature.27 13 Factory de
12、fault configuration .27 Annex A (informative): Bibliography.28 History 29 ETSI ETSI TS 102 973 V1.1.1 (2008-09) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, i
13、s publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on th
14、e ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which
15、 are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Access, Terminals, Transmission and Multiplexing (ATTM). Introduction The present document defines the requirements of a Network Termination (NT
16、) device for Next Generation Access Networks in different technologies. Because many options for such a device are feasible, depending on the access network technology, the business scenario, the regulatory constraints, etc., the present document provides a superset of the requirements for a Layer 2
17、 Network Termination: a specific NT device implementation may be derived by selecting the appropriate subset of technical requirements. The present document is organized as list of possible clauses for a joint specification to be used as Request for Information and to extract contributions to be sub
18、mitted to different Fora and Standardization bodies. Business Rationale As the next step in the evolution of Access Networks, it is foreseen that higher bandwidth services will be delivered, either with active network elements built closer to the end-user (e.g. VDSL or Point-to-Point FTTH technology
19、), or at the opposite end with active elements more distant from the end-user (e.g. GPON FTTH technology). Due to the deployment of new access networks, network operators are faced with technological, operational, financial and also regulatory challenges. The development of a Layer-2 Network Termina
20、tion (NT) device at the customer premises location for Next Generations Networks is related with the deployment of new very high broadband network access infrastructure and the need to ensure a competitive market for retail services. Since the investment for those deployments is very high, it is exp
21、ected that only a very limited number of operators can build the infrastructure. For this reason, in deployment scenarios where the investment in (part of) the infrastructure has geographically only been made by a single Access Network Provider (ANP), a wholesale offer like “Ethernet Bitstream“ will
22、 contribute to create a competitive market for retail services. This will allow more Service Providers to offer services to end users through a standard and unique Access Network-Home Network interface (Ethernet interface). The Ethernet Bitstream offering can be considered as a Layer-2 transport ser
23、vice from the end-user location to the Point of Presence (PoP) of the Broadband Service Provider (BSP), as an alternative to sub-loop unbundling. Then the BSP supplies the end user IP connectivity and optionally application services of its own or of other application service providers (ASP). At the
24、contrary, in deployment scenarios where several companies have invested in broadband network access infrastructure in a given geographical area, retail services competition is provided by sub-loop unbundling and therefore wholesale offer like “Ethernet Bitstream“ is not required. ETSI ETSI TS 102 97
25、3 V1.1.1 (2008-09) 5 The following scenarios can be considered: 1) Multiple access network providers in a given area/Single network operator per customer: each access network is owned by an operator offering its own bundle of services; the customer can churn from one operator to another. In this sce
26、nario the NT is not strictly mandatory as a stand-alone device. The operator can provide an integrated CPE device (Home Gateway) to its customer in order to terminate the xDSL or fiber optic link and to deliver its services. 2) Single access network provider in a given area/Multiple BSP per customer
27、: this scenario refers to a single open access network, owned by an ANP, providing open and equal access to many BSP that may simultaneously offer services to each customer via multiple virtual Ethernet connections. In this scenario the presence of the NT owned by the ANP is mandatory. The NT provid
28、es standard Ethernet multi-port interface(s) to the BSPs, with one (or more) different port(s) for each BSP. Each BSP can provide terminals (Home Gateway, Analogue Telephony Adapters, VoIP phones, IPTV Set Top Box) to its customer in order to deliver its services. In any case, the deployment of a NT
29、 with standard Ethernet interface enables the definition of service models where other Customer Premises Equipment (CPE) and terminals are provided by the BSP or alternatively can be purchased on the retail market by the customer. Both scenarios have a different impact on the requirements of the NT,
30、 but it is expected that having a NT device would: define a clear interface to allow the separation of responsibilities between the BSP and the ANP; help an ANP, providing wholesale services, to troubleshoot directly the end point of the access network at the NT-side, allowing end-to-end service ass
31、urance on the NGAN; allow the evolution of home networks and all IP-based services independently from the FTTx access network technology. However, since the NT is a L2 device, in case of multi-BSP-per-customer there are the following limitations: a separate IP home subnetwork corresponds to each dif
32、ferent BSP offering, so the customer cannot benefit from a single home network, and interaction between services of different broadband service providers are impossible within the home network; internal home network cabling becomes increasingly complex, if differentiation of broadband service provid
33、ers is made through different physical interfaces; the ANP needs to strictly isolate each BSP L2 flow, and cannot benefit from statistical multiplexing on the local (sub)loop and on the aggregation network. In conclusion, the multi-BSP-per-customer scenario provides the following features: free choi
34、ce for the customer to compose its own bundle of services from different BSPs; separation of responsibilities between the ANP investing in the infrastructure (responsible of the access network, including the NT) and the different BSPs (responsible of the home network and the services provided to the
35、 end customer). Figure 1 describes the reference architecture related to the use of a Network Termination device with standard Ethernet interface and different CPEs at the customer site. ETSI ETSI TS 102 973 V1.1.1 (2008-09) 6 ACCESS NETWORK PROVIDER Network-Service Interface (1n Ethernet) at custom
36、er home) BROADBAND SERVICE PROVIDER A terminal device may offer services such as VoIP and IPTV ANP provides and maintains the NT with the Access Network technology at that customer site (e.g. VDSL2) By means of a residential Home Gateway with different integrated or externally added LAN technologies
37、 (e.g. WLAN, PLT), a home network may be created and mainteined by the BSP ACCESS NETWORK NTHG#1 HOME NETWORK HG/ device#2 The wholesale service at the ANP-BSPinterface remains unchanged (e.g. Ethernet L2 bitstream), also upon upgrades of Access Network and NT Figure 1: Reference architecture for us
38、e of a Network Termination in NGN NT high-level functionalities The main features of the NT device, that are defined in the present document, are: termination of the access network at the customer premise, whatever access technology is used (ADSL2+, VDSL2, GPON, Point-to-Point FTTH with 100Base-BX):
39、 - when existing twisted pair lines and VDSL2 technology is used in the access, NT is self-installing by the customer on the existing POTS/ISDN termination connector; it is locally powered; it is under complete ownership and responsibility of the ANP, for provisioning and assurance purposes; remote
40、management of the NT is a possible feature; it is equipped with (at least) one standard LAN-technology Ethernet interface, for the interconnection to CPE/Home Gateways/Terminals provided by BSPs or ASPs; it may be equipped with more than one physical LAN Ethernet interface in order to enable multipl
41、e service devices and multi-BSP offerings; it supports VLAN traffic segregation and related functionalities; optionally, it may provide upstream QoS functionalities to enable L2 bitstream services; this feature is especially needed when there is a bottleneck in the upstream, more relevant in case of
42、 xDSL access; optionally, it may be remotely managed (firmware upgrade included). The following functionalities are not required for the NT device: lifeline in case of power interruption; VoIP/FXS ports and related functionalities; any other LAN interfaces except Ethernet; ETSI ETSI TS 102 973 V1.1.
43、1 (2008-09) 7 in case of multiple-BSP scenario, the intra-LAN connectivity between devices connected to different BSPs (in this case, the communication between these devices will use the WAN interface and geographical network). Such a NT device may support a wholesale business model for L2 bitstream
44、 services over the Next Generation Access Network. Reference block diagram for NT In the present document, the possible functionalities of the NT device are organized in a set of functional blocks, that may be included or not included in the device depending upon specific implementations and deploym
45、ents. NTWANINTERFACE(xDSLORGPONORP-t-PFTTH)ETHERNETLANINTERFACE(SINGLEPORTORMULTIPLEPORT)LAN-WAN L2 QOS MANAGEMENTREMOTE MANAGEMENTand FIRMWARE UPGRADEPHYSICAL USER INTERFACEFigure 2: Reference block diagram for the Network Termination device As outlined in figure 2, the functional blocks of the NT
46、device are the following: Physical user interface, as defined in the general requirements of the NT device (clause 4), including LEDs and buttons/switches. WAN physical interface (clause 5), that must be either xDSL, GPON or Point-to-point FTTH. The logical framing on the WAN interface (clause 6) is
47、 L2 Ethernet, but in case of xDSL/ADSL2+ also ATM framing must be supported. Ethernet LAN interface (clause 7), that must be equipped with either a single LAN port (single service provider scenario) or with multiple LAN ports (multiple service provider scenario). IP functionalities (clause 8) are no
48、t required, except when a TCP/IP based remote management feature is requested. LAN-WAN QoS functionalities for the upstream traffic (clause 9), may be required, e.g. in case of VDSL2 NT with multiple LAN ports. The remote management functional block (clause 11) is optional and may be implemented wit
49、h different solutions, depending upon the access technology on the WAN interface. ETSI ETSI TS 102 973 V1.1.1 (2008-09) 8 1 Scope The present document describes a proposal of requirements for a Network Termination (NT) device in Next Generation Access Networks. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. Non-specific reference may be made only to a complete document or a p
