1、 ETSI TR 102 629 V1.1.1 (2009-11)Technical Report Access, Terminals, Transmission and Multiplexing (ATTM);Reverse Power Feed for Remote NodesETSI ETSI TR 102 629 V1.1.1 (2009-11) 2Reference DTR/ATTM-06009 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
3、lable in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a
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 2009. 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 V1.1.1 (2009-11) 3Contents In
8、tellectual Property Rights 4g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.2 Informative references 6g33 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 11g34.4 Reverse Power Feed Options 11g34.5 UR2P Electrical Interface . 12g34.5.1 Current standards in force . 12g34.5.2 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. 15g34.9 Reverse Power Feed States . 16g34.10 Concatenated Reverse Power Feed Architectures 16g34.11 Power Sharing/Billing Model . 16g3
12、4.12 External Requirements on the Reverse Power Feed . 16g3History 17g3ETSI ETSI TR 102 629 V1.1.1 (2009-11) 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 pu
13、blicly 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 the ET
14、SI 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 are
15、, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Access, Terminals, Transmission and Multiplexing (ATTM). Introduction As various European operators consider the deployment of fibre-fed remote nodes that
16、contain ADSL2+/VDSL2 DSLAM equipment, it is necessary to consider the means of powering such remotely located equipment. One such method, known as “reverse power feed“, transmits the power from the customer premises to the fibre-fed remote node using the distribution-side copper network. ETSI TM6 ha
17、s agreed to create a new document that defines a reverse power feed transmission standard and which allows European operators to source suitably compliant equipment for inclusion in their networks. ETSI ETSI TR 102 629 V1.1.1 (2009-11) 51 Scope The present document identifies the scope of a reverse
18、power feed standard or standards that will allow operators to be able to source suitably compliant equipment for inclusion in their networks. The present document will identify the requirements for reverse power feed, consider the coexistence of reverse power feed with POTS and scenarios involving t
19、he deployment of reverse power feed for cabinet and distribution point locations. Other issues for consideration include: - Safety. - Efficiency. - Power Back-up. - Performance monitoring (for further study). - Reliability (for further study). - Power-sharing (for further study). - Billing (for furt
20、her study). Other issues such as local laws, unbundling rules and cost are considered out of scope. 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. No
21、n-specific reference may be made only to a complete document or a part thereof and only in the following cases: if it is accepted that it will be possible to use all future changes of the referenced document for the purposes of the referring document; for informative references. Referenced documents
22、 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 validity. 2.1 Normative references The following re
23、ferenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. Not applicable. ETSI ETSI TR 102 629 V1.1.1 (2009-11)
24、 62.2 Informative references The following referenced documents are not essential to the use of the present document but they assist the user with regard to a particular subject area. For non-specific references, the latest version of the referenced document (including any amendments) applies. i.1 I
25、EEE 802.3: “LAN/MAN CSMA/CD (Ethernet) Access Method“. NOTE: Available at http:/standards.ieee.org/getieee802/802.3.html. i.2 IR Cooper, DW Faulkner: “Reverse Powering Over DSL“. i.3 ON Semiconductor AND8333/D: “High Power PoE Applications, On Semiconductor application sheet“, April 2008. i.4 ETSI T
26、R 102 614: “Environmental Engineering (EE); Reverse powering of small access network node by end-user equipment : A4 interface“. i.5 ETSI EN 300 132-2: “Environmental Engineering (EE); Power supply interface at the input to telecommunications equipment; Part 2: Operated by direct current (dc)“. i.6
27、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.7 ETSI TS 102 533: “Environmental Engineering (EE) Measurement Methods and limits for
28、 Energy Consumption in Broadband Telecommunication Networks Equipment“. i.8 Code Of Conduct on Energy Consumption of Broadband Communication Equipment European Commission Directorate-General, Joint Research Centre; Final v2: 17 July 2007. i.9 CENELEC EN 60950-1: “Information Technology Equipment - S
29、afety Part 1 General requirements (IEC 60950-1 2005 Modified)“. 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 Sept. 2008. NOTE: While any h
30、yperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 3 Abbreviations For the purposes of the present document, the following terms and definitions apply: CO Central Office CPE Customer Premises Equipment DP Distribution Point NTE Net
31、work Termination Equipment ONU Optical Network Unit PD Powered Device PoE Power over Ethernet POTS Plain Old Telephony Service POTSA POTS - Analogue presentation POTSD POTS - derived PSE Power Sourcing Equipment RFT Remote Feeding Telecommunication RGW Residential GateWay SELV Safety or Separation E
32、xtra Low Voltage SG Service Gateway ETSI ETSI TR 102 629 V1.1.1 (2009-11) 7TNV Telecommunication Network Voltage 4 Reverse Power Feed for Remote Nodes 4.1 Reverse Power Feed Background The basic architecture of a reverse power feed system is shown below in figure 1. DPCOSGCentral Office Fibre-fed Re
33、mote Node(cabinet or DP located)Home networkPOTSA/POTSDLocal Power FeedPower fed to remote node 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 t
34、he home/building) which traverses the local loop to power a fibre-fed remote node which can 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 present
35、ation (POTSA) at the NTE and also as a derived POTS service (POTSD). Voice services can also be implemented as a derived service from the service gateway (SG). An issue with regards to reverse powered fibre-fed nodes is that of whom/what is responsible for the powering of common circuitry contained
36、within the node. It is easy to envisage that an individual user could be responsible for the 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 th
37、at terminates the fibre link. NOTE: In practice even this may not be easy to implement since 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 providi
38、ng power to the remote node but this may not be sufficient to power all of the remote node electronics 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 el
39、ectrical power. Such situations result in the requirement for battery back-up devices and these 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
40、NTE and fibre-fed remote node. It is envisaged that in order to provide high-reliability services (including lifeline POTS support) then a combination of battery back-up devices will be distributed throughout the network. ETSI ETSI TR 102 629 V1.1.1 (2009-11) 84.2 Power Backup Situations 4.2.1 Case
41、1 Battery Backup at the NTE DPCOFibre-fed Remote Node(cabinet or DP located)POTSA/POTSDPower 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 powe
42、r failure then lifeline POTSA (or maybe POTSD) plus OAM support at the remote node can be provided 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 signalcabinetNTEFi
43、gure 3: Battery Backup at the DP and NTE Figure 3 shows the addition of another battery backup 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 th
44、e DP Only Figure 4 shows the battery backup being located only at the DP. This arrangement takes 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 V1.1.1 (2009-11) 9DP
45、COCentral Office Fibre-fed Remote Node(cabinet or DP located)POTSA/POTSDPower fed to remote node 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
46、 remote node over same copper pair as XDSL signalcabinetNTEFigure 5: Battery Backup at the DP 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 ch
47、arged from the DPs. 4.2.5 Case 5 Battery Backup at the DP and Cabinet with Forwards Powering 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
48、TR 102 629 V1.1.1 (2009-11) 10Figure 6 shows another option where the battery located at the 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
49、4.3.1 Reverse Power Feed to the DP Reverse power feed to the DP is now considered in more detail. 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 100m 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 lengths, 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
