1、 ETSI TR 102 629 V2.1.2 (2011-03)Technical Report Access, Terminals, Transmission and Multiplexing (ATTM);Reverse Power Feed for Remote NodesETSI ETSI TR 102 629 V2.1.2 (2011-03) 2Reference RTR/ATTM-06023 Keywords ADSL, VDSL ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +
2、33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made avai
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4、 specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find e
5、rrors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in
6、 all media. European Telecommunications Standards Institute 2011. 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 registered for the benefit of its Members
7、and of the 3GPP Organizational Partners. LTE is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 102 629 V2.1.2 (2011-03) 3Contents In
8、tellectual Property Rights 4g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.2 Informative references 5g33 Abbreviations . 6g34 Reverse Power Feed for Remote Nodes . 7g34.1 Reverse Power Feed Background . 7g34.2 Power Backup Situations 8g34.2.1 Case 1 Batter
9、y Backup at the NTE . 8g34.2.2 Case 2 Battery Backup at the DP and NTE 8g34.2.3 Case 3 Battery Backup at the DP Only . 8g34.2.4 Case 4 Battery Backup at the DP and Cabinet 9g34.2.5 Case 5 Battery Backup at the DP and Cabinet with Forwards Powering from the CO. 9g34.3 Options for Reverse Power and Fo
10、rwards Power Feed 10g34.3.1 Reverse Power Feed to the DP 10g34.4 Reverse Power Feed Architecture 11g34.4a Reverse Power Feed Options 11g34.5 UR2PElectrical Interface . 11g34.5.1 Current standards in force . 11g34.5.2 Telecommunications cables 12g34.5.3 Safety of personnel . 12g34.6 ONU Power Consump
11、tion 12g34.7 Reverse Power Feed Specification . 13g34.7.1 Distribution Point Reverse Powering 13g34.7.2 Cabinet Reverse Powering 14g34.8 Reverse Power Feed and POTS 15g34.8.1 Class 1 . 15g34.8.2 Class 2 . 18g34.8.3 Class 3 . 19g34.8.4 Class 4 . 19g34.8.5 POTS-only Requirements Essential, or potentia
12、lly Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the 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
13、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 are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Acc
14、ess, Terminals, Transmission and Multiplexing (ATTM). Introduction As various European operators consider the deployment of fibre-fed remote nodes that contain ADSL2+/VDSL2 DSLAM equipment, it is necessary to consider the means of powering such remotely located equipment. One such method, known as “
15、reverse power feed“, transmits the power from the customer premises to the fibre-fed remote node using the distribution-side copper network. ETSI TM6 has agreed to create a new document that defines a reverse power feed transmission standard and which allows European operators to source suitably com
16、pliant equipment for inclusion in their networks. ETSI ETSI TR 102 629 V2.1.2 (2011-03) 51 Scope The present document identifies the scope of a reverse power feed standard or standards that will allow operators to be able to source suitably compliant equipment for inclusion in their networks. The pr
17、esent document will identify the requirements for reverse power feed, consider the coexistence of reverse power feed with POTS and scenarios involving the deployment of reverse power feed for cabinet and distribution point locations. Other issues for consideration include: - Safety. - Efficiency. -
18、Power Back-up. - Performance monitoring (for further study). - Reliability (for further study). - Power-sharing (for further study). - Billing (for further study). Other issues such as local laws, unbundling rules and cost are considered out of scope. 2 References References are either specific (ide
19、ntified 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 any amendments) applies. Referenced documents which are not found to
20、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 validity. 2.1 Normative references The following referenced documents are n
21、ecessary 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 to a particular subject area. i.1 IEEE 802.3: “LAN/MAN CSMA/CD (Ether
22、net) Access Method“. NOTE: Available at http:/standards.ieee.org/getieee802/802.3.html. i.2 IR Cooper, DW Faulkner: “Reverse Powering Over DSL“. Proceedings of the 13th European Conference on Networks and Optical Communications (NOC 2008) 1 - 3 July 2008, Krems, Austria. i.3 ON Semiconductor AND8333
23、/D: “High Power PoE Applications, On Semiconductor application sheet“, April 2008. ETSI ETSI TR 102 629 V2.1.2 (2011-03) 6i.4 ETSI TR 102 614: “Environmental Engineering (EE); Reverse powering of access network unit by end-user equipment: A4 interface“. i.5 ETSI EN 300 132-2: “Environmental Engineer
24、ing (EE); Power supply interface at the input to telecommunications equipment; Part 2: Operated by direct current (dc)“. i.6 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
25、 interface for short line interface“. i.7 ETSI TS 102 533: “Environmental Engineering (EE) Measurement Methods and limits for Energy Consumption in Broadband Telecommunication Networks Equipment“. i.8 Code Of Conduct on Energy Consumption of Broadband Communication Equipment European Commission Dire
26、ctorate-General, Joint Research Centre; Final v2: 17 July 2007. i.9 Void. i.10 CENELEC EN 60950-21: “Information Technology Equipment - Safety. Part 21 Remote Power Feeding (IEC 60950-21:2002)“. i.11 BT contribution 08CC-020: “Remote Node Powering“, ITU SG-15, Campbell, CA, 15-19 September 2008. i.1
27、2 BT Network Requirement 181, Signalling System AC15, Issue 06, August 1989“. NOTE: Available at http:/ 3 Abbreviations For the purposes of the present document, the following terms and definitions apply: ATA Analogue Terminal Adaptor CLASS Customer Local Access Signalling System CO Central Office C
28、PE Customer Premises Equipment DC Direct Current DP Distribution PointDSL Digital Subscriber Line DSLAM Digital Subscriber Line Access Multiplexer ECS Electronic Communications Services EOC Embedded Operations Channel FTTx Fibre To The x (where x could be cabinet, premises etc.) HGW Home GateWay ISD
29、N Integrated Services Digital Network NTE Network Termination Equipment NTU Network Terminating Unit ONU Optical Network Unit PATS Publicly Available Telephone Service PoE Power over Ethernet POTS Plain Old Telephony Service POTSA POTS - Analogue presentation POTSD POTS - derived PSTN Public Switche
30、d Telephone Network PVC Permanent Virtual Circuit RFT Remote Feeding Telecommunication SELV Safety or Separation Extra Low Voltage SG Service Gateway SU Service UnitVDC Voltage (Direct Current) VDSL2 2ndgeneration Very high-speed Digital Subscriber Line VoIP Voice over Internet Protocol ETSI ETSI TR
31、 102 629 V2.1.2 (2011-03) 74 Reverse Power Feed for Remote Nodes 4.1 Reverse Power Feed Background The basic architecture of a reverse power feed system is shown in figure 1. DPCOSGCentral Office Fibre-fed Remote Node(cabinet or DP located)Home networkPOTSA/POTSDLocal Power FeedPower fed to remote n
32、ode over same copper pair as XDSL signalcabinetNTEDerived VoicePOTSDFigure 1: Generic Reverse Power Feed Architecture Figure 1 shows power being injected at the NTE from a local power source (located within the home/building) which traverses the local loop to power a fibre-fed remote node which can
33、be located at either the DP or cabinet using the same copper pair cable that is used to transmit the xDSL to/from the home/fibre-fed remote node. A metallic POTS service is shown both with an analogue presentation (POTSA) at the NTE and also as a derived POTS service (POTSD). Voice services can also
34、 be implemented as a derived service from the service gateway (SG). An issue with regards to reverse powered fibre-fed nodes is that of who/what is responsible for the powering of common circuitry contained within the node. It is easy to envisage that an individual user could be responsible for the
35、powering of the remote line terminating/driver electronics corresponding to their particular circuit (see note). However, it is not so easy to determine who/what is responsible for powering of say the ONU that terminates the fibre link. NOTE: In practice even this may not be easy to implement since
36、DSL chipsets may be of an octal channel design and therefore all eight channels will be required to be powered in order to operate a single channel. There may be occasions where only a single user is providing power to the remote node but this may not be sufficient to power all of the remote node el
37、ectronics for proper operation. Also, there may be occasions where say a GPON feed requests a response from the ONU (for ranging or management purposes) when no users are currently connected and providing electrical power. Such situations result in the requirement for battery back-up devices and the
38、se may be located in the SG, remote node itself or the cabinet providing that spare copper-pairs remain connected to the fibre-fed remote node. Figure 2 shows battery backup devices have been located in the NTE and fibre-fed remote node. It is envisaged that in order to provide high-reliability serv
39、ices (including lifeline POTS support) then a combination of battery back-up devices will be distributed throughout the network. ETSI ETSI TR 102 629 V2.1.2 (2011-03) 84.2 Power Backup Situations 4.2.1 Case 1 Battery Backup at the NTE DPCOFibre-fed Remote Node(cabinet or DP located)POTSA/POTSDPower
40、fed to remote node over same copper pair as XDSL signalcabinetNTEFigure 2: Battery Backup at NTE Figure 2 shows the case where battery backup is placed at the NTE. The aim being that if there is a local power failure then lifeline POTSA (or maybe POTSD) plus OAM support at the remote node can be pro
41、vided by the battery backup. 4.2.2 Case 2 Battery Backup at the DP and NTE DPCOFibre-fed Remote Node(cabinet or DP located)POTSA/POTSDPower fed to remote node over same copper pair as XDSL signalcabinetNTEFigure 3: Battery Backup at the DP and NTE Figure 3 shows the addition of another battery backu
42、p located at the DP. This gives the advantage in that equipment located at the DP can remain powered even though no subscribers are connected and thus retaining OAM support. 4.2.3 Case 3 Battery Backup at the DP Only Figure 4 shows the battery backup being located only at the DP. This arrangement ta
43、kes away the responsibility for backup from the subscriber - but probably means in practice that a larger capacity backup device is required when compared to Case 2. ETSI ETSI TR 102 629 V2.1.2 (2011-03) 9DPCOCentral Office Fibre-fed Remote Node(cabinet or DP located)POTSA/POTSDPower fed to remote n
44、ode over same copper pair as XDSL signalcabinetNTEFigure 4: Battery Back-up at the DP 4.2.4 Case 4 Battery Backup at the DP and Cabinet DPCOFibre-fed Remote Node(cabinet or DP located)POTSA/POTSDPower fed to remote node over same copper pair as XDSL signalcabinetNTEFigure 5: Battery Backup at the DP
45、 and Cabinet Figure 5 shows the battery backup being located at the cabinet and the DP. This arrangement allows a smaller battery to be located at the DP. The battery at the cabinet could be reverse power charged from the DPs. 4.2.5 Case 5 Battery Backup at the DP and Cabinet with Forwards Powering
46、from the CO DPCOCentral Office Fibre-fed Remote Node(cabinet or DP located)POTSA/POTSDPower fed to remote node over same copper pair as XDSL signalcabinetNTEFigure 6: Forwards Powering from the CO ETSI ETSI TR 102 629 V2.1.2 (2011-03) 10Figure 6 shows another option where the battery located at the
47、cabinet is forwards power trickle charged from the CO. This instance relies upon there being copper cable still existing between the CO and the cabinet. 4.3 Options for Reverse Power and Forwards Power Feed 4.3.1 Reverse Power Feed to the DP Reverse power feed to the DP is now considered in more det
48、ail. Figure 7 shows the sample lengths of 9 million drop-wires in the UK i.2 (note the rise above 100 m is caused by all drop-wires above 100 m being summed into a common bin). It can be clearly seen from figure 7 that the average length of a drop-wire (in the UK) is approximately 30 m. Over such le
49、ngths, it is not necessary to operate at high voltages in order to reduce copper losses to an acceptable level and therefore it is possible to operate at SELV levels (60 V dc) in order to achieve a reasonably efficient reverse powering scheme. Sample of dropwire lengths00.050.10.150.202040608010drop length x (m)Fraction(x)Figure 7: Sample UK Dropwire Lengths i.2 As a starting basis for such a powering scheme it would be possible to adopt/modify existing technology in the form of IEEE 802.3-2005 i.1
