1、 ETSI TS 101 548 V1.2.1 (2014-11) Access, Terminals, Transmission and Multiplexing (ATTM); European Requirements for Reverse Powering of Remote Access Equipment TECHNICAL SPECIFICATION ETSI ETSI TS 101 548 V1.2.1 (2014-11)2Reference RTS/ATTM-0631 Keywords VDSL2 ETSI 650 Route des Lucioles F-06921 So
2、phia Antipolis Cedex - FRANCE Tel.: +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 The present document can be downloaded from: http:/www.etsi.org The present document
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6、zed in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to re
7、production in all media. European Telecommunications Standards Institute 2014. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of
8、the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 101 548 V1.2.1 (2014-11)3Contents Intellectual Property Rights 4g3Foreword . 4g3Modal verbs terminology 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normative referen
9、ces . 5g32.2 Informative references 5g33 Definitions, symbols and abbreviations . 6g33.1 Definitions 6g33.2 Symbols 6g33.3 Abbreviations . 6g34 Introduction to Reverse Power Feed 8g34.1 Introduction 8g35 Reverse Power Feed Architecture 9g35.1 Introduction 9g35.2 Reverse Power Feed and POTS Co-Existe
10、nce . 9g35.2.1 Background . 9g35.2.2 POTS Adapters . 10g35.2.2.1 POTS Adapter - E (POTSA-E) . 10g35.2.2.2 POTS Adapter - C (POTSA-C) . 10g35.2.2.3 POTS Adapter - D (POTSA-D) 10g35.3 Reverse Power Feed Architecture without POTS on the same pair (RPFA-NOP). 11g35.4 Reverse Power Feed Architecture with
11、 Baseband POTS from the Exchange (RPFA-EXP) 12g35.5 Reverse Power Feed Architecture with Baseband POTS from the Exchange Sharing the in-premises Wiring (RPFA-EXPSW) 14g35.6 Reverse Power Feed Architecture with Derived POTS (RPFA-DRP) . 15g35.7 Reverse Power Feed Architecture with Derived POTS Sharin
12、g the in-premises Wiring (RPFA-DRPSW) 16g36 Reverse Power Feed Start-Up Protocol 17g36.1 Introduction 17g36.2 Communications-based Start-up (CBSU) Protocol 18g36.3 CBSU Protocol Specific Transmission Parameters 20g37 Reverse Power Feed Power Supply Characteristics . 21g37.1 RPF Range Options and Cla
13、sses 21g37.2 RPF Safety Requirements 24g37.2.1 Background . 24g37.2.2 Unintended consequences . 25g37.3 Electrical reference model 25g37.4 Zero touch DPU . 26g3Annex A (informative): Reverse power backup systems 27g3A.1 Case 1 battery backup in the CPE 27g3A.2 Case 2 battery backup in the DPU and CP
14、E . 27g3Annex B (normative): General POTS requirements 28g3Annex C (informative): Bibliography . 29g3History 30g3ETSI ETSI TS 101 548 V1.2.1 (2014-11)4Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaini
15、ng to these essential IPRs, if any, is 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 Secretaria
16、t. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org). 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 E
17、TSI Web server) which 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). Modal verbs terminology In the present document “shall“, “shall no
18、t“, “should“, “should not“, “may“, “may not“, “need“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when
19、 used in direct citation. Introduction As various Operators consider the deployment of fibre-fed remote nodes that contain xDSL 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
20、 the customer premises to the fibre-fed remote node using the distribution-side copper network. The present document defines a reverse power feed transmission standard which allows Operators to source suitably compliant equipment for inclusion in their networks. The reverse power feed methodology ca
21、n be used to power a remote node hosting any metallic transmission system (e.g. FAST i.6, VDSL2 i.7, etc.). ETSI ETSI TS 101 548 V1.2.1 (2014-11)51 Scope The present document defines architectures for reverse powering of remote network nodes from multiple CPEs. The architectures describe how to comb
22、ine reverse power feed with POTS and data transmission. Options for combining reverse powering with battery backup are also described. The present document identifies requirements for POTS signalling translation when operated over reverse power feed. Start-up protocols are defined that will ensure s
23、afe connection of reverse powered systems. Management requirements for reverse power feed and power combining within the remote network node are specified. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For spe
24、cific 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 be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference
25、. 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 necessary for the application of the present document. 1 ETSI ES 202 971: “Access and Terminals
26、(AT); Public Switched Telephone Network (PSTN); Harmonized specification of physical and electrical characteristics of a 2-wire analogue interface for short line interface“. 2 CENELEC EN 60950-1: “Information Technology Equipment - Safety, Part 1: General requirements (IEC 60950-1:2005 + Cor.:2006 +
27、 A1:2009, modified)“. 3 ETSI ES 203 021: “Access and Terminals (AT); Harmonized basic attachment requirements for Terminals for connection to analogue interfaces of the Telephone Networks; Update of the technical contents of TBR 021, EN 301 437, TBR 015, TBR 017“. 4 Recommendation ITU-T G.994.1: “Ha
28、ndshake procedures for digital subscriber line transceivers“. 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 (Ethernet) Acc
29、ess Method“. NOTE: Available at http:/standards.ieee.org/getieee802/802.3.html. i.2 NICC ND 1645 (V1.1.2) (2011-06): “NGA Telephony; Architecture and requirements“. NOTE: Available at http:/www.niccstandards.org.uk/files/current/ND1645v1.1.2.pdf?type=pdf. i.3 ETSI TS 101 952-1: “Access network xDSL
30、splitters for European deployment; Part 1: generic specification of xDSL over POTS splitters“. i.4 Recommendation ITU-T G.993.2: “Very high speed digital subscriber line transceivers 2 (VDSL2)“. i.5 Recommendation ITU-T G.993.2 Amendment 5: “Short reach VDSL2 with reduced power and enhanced data rat
31、e“. ETSI ETSI TS 101 548 V1.2.1 (2014-11)6i.6 Recommendation ITU-T G.9700 (04/14): “Fast access to subscriber terminals (FAST) - Power spectral density specification“. i.7 ETSI TS 101 271 (V1.2.1): “Access, Terminals, Transmission and Multiplexing (ATTM);Access transmission systems on metallic acces
32、s cables; Very High Speed digital subscriber line system (VDSL2) Recommendation ITU-T G.993.2 modified“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: power splitter: device that performs a frequency spli
33、tting/combining function between the services being carried (which can include POTS and xDSL based services) and the injected DC electrical power service splitter: low pass filter that separates baseband POTS from xDSL frequencies NOTE: The relevant specifications for the service splitter can be fou
34、nd in ETSI TS 101 952-1 i.3. 3.2 Symbols For the purposes of the present document, the following symbols apply: R 2-wire analogue presented interface U-R Reference point at CPE containing both DC power and service data U-R2 Reference point at CPE containing the filtered service data U-R2P Reference
35、point at CPE containing the injected DC power U-R2S Reference point at CPE containing the baseband POTS and the converted POTS signalling U-O Reference point at DPU containing both DC power and service data U-O2 Reference point at DPU containing the filtered service data U-O2O Reference point at DPU
36、 containing the baseband POTS and the converted POTS signalling U-O2P Reference point at DPU containing the extracted DC power 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: 4PPoE 4-Pair Power over Ethernet ACT Active ATA Analogue Telephone Adapter BAT
37、 Battery CBSU Communications based Start-Up protocol CO Central Office CP Customer Premises CPE Customer Premises Equipment CPE ME CPEs Management Entity DBPSK Differential Binary Phase Shift Keying DC Direct Current DN Distribution Network DP Distribution PointDPU Distribution Point Unit DPU ME DPU
38、s Management Entity DSL Digital Subscriber LineFTTdp Fibre To The distribution point FTTP Fibre To The Premises ETSI ETSI TS 101 548 V1.2.1 (2014-11)7FTU FAST Transceiver Unit NOTE: See Recommendation ITU-T G.9700 i.6. FTU-O FTU at the DPU FTU-R FTU at the remote site GPON Gigabit Passive Optical Ne
39、twork HON Higher Order Node LPF Low Pass Filter LR Long RangeME Management Entity NMS Network Management System NT Network Termination NTE Network Termination Equipment NTU Network Terminating Unit OAM Operations And MaintenanceOLT Optical Line Termination ONU Optical Network Unit PD Powered Device
40、PDU Power Distribution Unit PE Power Extraction PHY Physical (layer) PME-C CPEs Power Management Entity PME-D DPUs Power Management Entity PMT Power Management Transceiver PoDL Power over Data Line POTS Plain Old Telephony Service PS Power Splitter PSE Power Sourcing Equipment PSU Power Supply Unit/
41、Combiner PWD PoWereD RDY Ready RFT Remote Feed Telecommunication RPCE Reverse Power Control Entity RPD Remote Powered Device RPF Reverse Power Feed RPFA-DRP Reverse Power Feed Architecture - Derived POTS RPFA-DRPSW Reverse Power Feed Architecture - Derived POTS Sharing in-premises Wiring RPFA-EXP Re
42、verse Power Feed Architecture - Exchange POTS RPFA-EXPSW Reverse Power Feed Architecture - Exchange POTS Sharing in-premises Wiring RPFA-NOP Reverse Power Feed Architecture - No POTS SELV Safety Extra Low Voltage SG Service Gateway SR Short RangeSS Service Splitter SU Service UnitTNV Telecommunicati
43、on Network Voltage VA Volt Ampere VDSL Very high speed Digital Subscriber Line VoIP Voice over Internet Protocol VTU VDSL2 Transceiver Unit NOTE: See Recommendation ITU-T G.993.2 i.4. VTU-O VTU at the ONU VTU-R VTU at the remote site xDSL Unspecified DSL variant xTU-O FTU-O or VTU-O xTU-R FTU-R or V
44、TU-R ETSI ETSI TS 101 548 V1.2.1 (2014-11)84 Introduction to Reverse Power Feed 4.1 Introduction The basic architecture of a fibre-fed remote node with reverse power feed is shown below in Figure 1. Figure 1: Generic Fibre-fed Remote Node Architecture with reverse power feed Figure 1 shows power bei
45、ng injected at the NTE from a local power source (located within the home and/or building) which traverses the local loop to power a fibre-fed remote node which can be located at either the distribution point (DP) or cabinet using the same copper pair cable that is used to transmit the xDSL to/from
46、the home/fibre-fed remote node. A metallic POTS service is shown at the NTE. 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 who or what is responsible for the powering of common circuitry
47、contained within the node. It is easy to envisage that an individual user should be responsible for the powering of the remote line terminating/driver electronics corresponding to his particular circuit. However, it is not so easy to determine who or what is responsible for powering of say the ONU t
48、hat terminates the fibre link. 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 electronics for proper operation. Also, there may be occasions where say a GPON feed requests a response from the ONU (f
49、or ranging or management purposes) when no users are currently connected and providing electrical power. It is recognized that one single (i.e. generic) specification cannot consider all possible architectural variants, therefore the present document has been organized as a series of architecture options and equipment shall adhere to one or more of these options. ETSI ETSI TS 101 548 V1.2.1 (2014-11)95 Reverse Power Feed Architecture 5.1 Introduction There shall be compatibility with other architectures such as forwards powering of remo
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