1、 ETSI TR 102 614 V1.1.1 (2010-06)Technical Report Environmental Engineering (EE);Reverse powering of access network unit by end-user equipment: A4 interfaceETSI ETSI TR 102 614 V1.1.1 (2010-06) 2Reference DTR/EE-02038 Keywords access, network, REV ETSI 650 Route des Lucioles F-06921 Sophia Antipolis
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8、 (2010-06) 3Contents Intellectual Property Rights 4g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.2 Informative references 5g33 Abbreviations . 6g34 Power interfaces between the Network Termination and the Optical Network Unit or remote DSL unit 7g34.1 Bac
9、k feeding or Reverse Powering Architecture 7g34.2 Backfeeding or Reverse Powering Architecture Options . 8g34.3 A4 interface at the pair interface arrival . 8g34.4 ANU Power consumption 9g34.5 Back-up options 9g35 Progressive installation issue 11g36 Failure detection, alarms, reparation and control
10、 monitoring 11g37 Reliability, dependability and contract between operator and customer 11g38 Regulatory aspects 12g3Annex A: Backfeeding Power as a function of output voltage and pairs size and length 13g3Annex B: Backfeeding principle in overlay of PSTN +DSL . 15g3Annex C: Safety consideration for
11、 remote feeding 16g3History 19g3ETSI ETSI TR 102 614 V1.1.1 (2010-06) 4Intellectual 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, is publicly available for ETSI members and n
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14、o the present document. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Environmental Engineering (EE). Introduction To build increased Broadband access networks, one solution is the GPON using FTTC or FFTB or any other common equipment with optical fibre input and
15、copper pairs close to a cluster of customers. Today, the power supply is obtained by local electrical mains connection or by remote power distribution on pairs from a central office. But, sometimes, there is not enough copper or the length of the copper is too long to allow remote powering over the
16、telecom networks and connection to the local electrical mains is not possible or too expensive. Thus, it is advisable to extent the range of possible powering solutions by using a solution called reverse powering or back feeding. ETSI ATTM TM6 is developing a Technical Report to consider powering op
17、tions for remote DSL nodes (TR 102 629 i.21) which requires powering interface standardization. Thepresent document introduces a possible revision for complement to EN 302 099 i.3. In that solution, the line termination equipment supplies the power to the ONU or ONT through the final distribution co
18、pper line to the home. This is under consideration in ITU-T SG15 i.22 in the GPON powering issue. In that case, there is an injection of power in the pair at the level of one client or one client group network termination (individual or building). At first sight, this seems strange to require from a
19、 customer to provide power for common equipment to several customers, but this concept is already used for common radio equipment linked to a cluster of customers. Sharing the power can be seen as equivalent to share WIFI resources in an adhoc network architectures. Alternatively, one can think abou
20、t a combination of power sources located at the curb and at the customer premises such that subscribers are only powering the services they use. ETSI ETSI TR 102 614 V1.1.1 (2010-06) 51 Scope The present document scope is the back feeding or reverse powering architecture that can supply power to acc
21、ess network unit such as ONU or ONT or remote DSL unit from the customer through its final distribution access copper pair. As a minimum, the present document defines a power interfaces over the customer copper pair to the access network unit (remote DSL unit or ONU such as FTTC or FTTB cabinet) def
22、ined in TR 102 629 i.21. Other important issues are under discussion in the present document: overlay of PSTN on the same pair and back-up (autonomy, locations, environments and safety), reliability and monitoring aspects are also addressed. Other issues about local laws, unbundling rules, and cost
23、are out of the scope. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including
24、 any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term valid
25、ity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. Not applicable. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard
26、 to a particular subject area. i.1 ETSI EN 300 019-1-4: “Environmental Engineering (EE); Environmental conditions and environmental tests for telecommunications equipment; Part 1-4: Classification of environmental conditions; Stationary use at non-weatherprotected locations“. i.2 ETSI EN 300 132-2:
27、“Environmental Engineering (EE); Power supply interface at the input to telecommunications equipment; Part 2: Operated by direct current (dc)“. i.3 ETSI EN 302 099: “Environmental Engineering (EE); Powering of equipment in access network“. i.4 IEC EN 60896-21: “Stationary lead-acid batteries - Part
28、21: Valve regulated types - Methods of test“. i.5 IEC EN 60950-22: “Information technology equipment -Safety - Equipment to be installed outdoors“. i.6 IEC EN 50272-2: “Safety requirements for secondary batteries and battery installations - Part 2: Stationary batteries“. i.7 ETSI TS 102 533: “Enviro
29、nmental Engineering (EE) Measurement Methods and limits for Energy Consumption in Broadband Telecommunication Networks Equipment“. ETSI ETSI TR 102 614 V1.1.1 (2010-06) 6i.8 IEC TR 62102 (second edition): “Electrical safety - Classification of interfaces for equipment to be connected to information
30、and communications technology networks“. i.9 IEC EN 60950-1: “Information Technology Equipment - Safety“. i.10 Directive 2002/22/EC modified by 2007/0248 (COD): “European Directives on universal service“. i.11 Code Of Conduct on Energy Consumption of Broadband Communication Equipment European Commis
31、sion Directorate-General, Joint Research Centre. i.12 ETSI ES 202 971: “Access and Terminals (AT); Public Switched Telephone Network (PSTN); Harmonized specification of physical and electrical characteristics of a 2-wire analogue interface for short line interface“. i.13 IEC TS 62367: “Safety aspect
32、s for xDSL signals on circuits connected to telecommunication networks (DSL: Digital Subscriber Line)“. i.14 IEC TS 60479-1: “Effects of current on human beings and livestock -Part 1: General aspects“. i.15 IEC 60 364-4-41: “Low voltage electrical installations part 4-41 Protection for safety protec
33、tion against electrical shock“. i.16 ETSI EN 300 253: “Environmental Engineering (EE); Earthing and bonding of telecommunication equipment in telecommunication centres“. i.17 IEC EN 60364-1: “Low voltage electrical installations - Part 1: Fundamentals principles, assessment of general characteristic
34、s, definition“. i.18 ETSI ES 202 336-1: “Environmental Engineering (EE); Monitoring and Control Interface for Infrastructure Equipment (Power, Cooling and Building Environment Systems used in Telecommunication Networks) Part 1: Generic Interface“. i.19 IEC EN 60950-21: “Information technology equipm
35、ent - Safety - Part 21: Remote power feeding“. i.20 IEC TS 61201: “Use of conventional touch voltage limits - Application guide“. i.21 ETSI TR 102 629: “Access, Terminals, Transmission and Multiplexing (ATTM); Reverse Power Feed for Remote Nodes“. i.22 ITU-T SG15- WD GR07 (WP 1/15): “GPON powering i
36、ssue“. i.23 IEC EN 60364-4-41: “Electrical installations of buildings - Part 4-41: Protection for safety - Protection against electric shock“. i.24 The New Product Safety Standard for Communication Technology Equipment Wilfried SCHULZ - (T-Systems Enterprise Services GmbH) Goslarer Ufer 35, D-10589
37、Berlin, Germany. NOTE: For more information, please contact mwilfried.schulzt- 3 Abbreviations For the purposes of the present document, the following abbreviations apply: AC Alternating Current ANU Access Network Unit BBCoC Broadband Code of Conduct CO Central Office CPE Customer Premises Equipment
38、 (equivalent to End-User Equipment) DC Direct Current DSL Digital Subscriber Line DSLAM Digital Subscriber Line Access Module FTTC Fibre to the Cabinet FTTB Fibre to the Building ETSI ETSI TR 102 614 V1.1.1 (2010-06) 7HGW Home Gate Way G-PON Gigabit capable Passive Optical Network LCA Life Cycle Ass
39、essment NT Network Termination NTE Network Termination Equipment OF Optical Fibre ONT Optical Network Termination ONU Optical Network Unit PC Personal ComputerPON Passive Optical Network POTS Plain Old Telephony Service PSTN Phone Subscriber Transmission Network RFT Remote Feeding Telecommunication
40、SELV Safety Extra Low Voltage VRLA Valve regulated lead acid 4 Power interfaces between the Network Termination and the Optical Network Unit or remote DSL unit 4.1 Back feeding or Reverse Powering Architecture A typical example of the power architecture of backfeeding (or reverse powering) is propos
41、ed on figure 1 in order to define reverse power interface A4. ONUOFPSUFinal distribution Copper pairOption 1: customer battery“A“interfaceOption 2: Super-capacitoror battery“A4“interfacexDSLPPxDSLP= reverse powerS = standard signal interface (combining xDSL + ISDN or POTS signal including remote pow
42、ering from central office)S/P = Signal/Power filterPG = Power gathering (or combining) Interface with S/P filter function.FTTxAC plugCu pair(PSTN)End-userterminalsorHGWDistantCOPoweroptionPSPOTS or ISDNS/PS/PPGCPEFigure 1: back feeding or reverse powering architecture (example in order to define A4
43、interface) ETSI ETSI TR 102 614 V1.1.1 (2010-06) 8The remote cabinet (ONU or remote DSL unit or .) under consideration (more generally ANU) is generally located in FTTB or FFTC cabinet or underground chamber. The telecom node equipment is common to N customer (x=Building, Curb, Node, ), and is gener
44、ally powered through 48 V interface A as defined in EN 300 132-2 i.2 by a power gathering interface PG receiving pairs from customer through a filter separating signal S and power P (S/Pfilter). The S/Pfilteris out of the scope of the present document. The interface on the different telecom existing
45、 line should not be affected by reverse powering, so that there should be no change for the existing central office equipment or home terminals. The voltage on the distribution line between the customer and the telecom node equipment may be different than the POTS voltage or ISDN voltage if the dist
46、ance or power load needs higher voltage to allow power transport with an acceptable efficiency. The pairs are powered by customer wall adapters though an S/Pfilterconnected to the home phone pair network defined by ES 202 971 i.12. The same wall adapter may be used to power the client home gateway,
47、often called “box“. The power interface with the pair between customer and ANU is called A4 and located in figure 1. NOTE : With the same voltage interface as DSL over POTS or ISDN, the filter is very similar to existing one. 4.2 Backfeeding or Reverse Powering Architecture Options There should be a
48、 compatibility with other architecture such as remote powering or mains power supply which is very simple when the power input interface of the ANU or remote DSL is the interface A i.2. There may be options such as back-up in the FTTx or/and in the customer premises. There should be also possible co
49、ntributions between different power supplies for example: When there is not enough remote pairs, a part of the power can be provided by reverse powering, e.g. the energy for the common parts could be provided from the CO, while the energy for the single line could be provided by each customer. NOTE 1: This can be useful to allow initial powering at installation with few customers, or in special area or time where a lot of customers shut down their systems (e.g. tourist area with great variation of n
