1、 ETSI TS 101 952-3 V1.1.1 (2012-02) Access, Terminals, Transmission and Multiplexing (ATTM); Access network xDSL splitters for European deployment; Part 3: Generic specification of static distributed filters for xDSL over POTS Technical Specification ETSI ETSI TS 101 952-3 V1.1.1 (2012-02)2Reference
2、 RTS/ATTM-06019 Keywords 2-WIRE, access, ADSL, analogue, broadband, distributed filters, POTS, splitter, VDSL ETSI 650 Route des Lucioles F-06921 Sophia 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 enregist
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8、 101 952-3 V1.1.1 (2012-02)3Contents Intellectual Property Rights 6g3Foreword . 6g3Introduction 7g31 Scope 8g32 References 8g32.1 Normative references . 8g32.2 Informative references 9g33 Definitions, symbols and abbreviations . 10g33.1 Definitions 10g33.2 Symbols 11g33.3 Abbreviations . 12g34 Gener
9、al functional description of xDSL over POTS distributed filters . 13g34.1 Functional diagram . 14g34.2 High pass filter . 14g35 Circuit definitions, testing conditions and methods . 14g35.1 DC and ringing testing conditions 14g35.1.1 Polarity independence . 14g35.1.2 DC feeding conditions (on-hook/o
10、ff-hook) 15g35.1.3 DC feeding and loading bridges . 15g35.1.4 Ringing signal voltage 16g35.2 AC Terminating impedances 16g35.2.1 ZrefDSLand ZDSL. 16g35.2.2 ZRand ZSL, off-hook impedances . 17g35.2.3 ZRHF, xDSL band impedance 17g35.2.4 ZOnHI, on-hook high impedance 17g35.2.5 ZOnLI, on-hook low impeda
11、nce 18g35.2.6 ZOnHo, impedance on-hook 18g35.2.7 Zring, load impedance for ringing. 18g35.2.8 ZMeter, impedance of the metering device 19g35.3 Absence of a high pass filter 19g35.4 General transmission test setup 19g35.4.1 General definition of the Insertion Loss (IL) measurement 20g35.4.2 POTS sign
12、al loss: IL between LINE port and POTS port. 20g35.4.3 xDSL signal isolation: IL between LINE and POTS port . 21g35.4.4 xDSL signal loss: IL between LINE port and xDSL port . 22g35.4.5 General definition of the Return Loss . 23g35.4.6 Return Loss test set-up at LINE port and POTS port 23g35.5 Unbala
13、nce measurement . 24g35.5.1 General definition of Longitudinal Conversion Loss 24g35.5.2 General definition of Longitudinal Conversion Transfer Loss . 25g35.5.3 LCL and LCTL test set-up 25g35.6 Noise measurement 26g35.6.1 Psophometric noise in the POTS Band . 26g35.6.2 Noise in the xDSL Band . 26g35
14、.7 Common Mode Rejection Ratio measurement . 26g36 Distributed filter requirements . 27g36.1 Classification of distributed filters according to requirements . 27g36.1.1 Justification of the classification . 27g36.1.2 Basic filter requirements . 27g36.1.3 Standard filter requirements 27g36.1.4 Enhanc
15、ed filter requirements 28g36.1.5 Option A and Option B as defined for central splitters . 28g3ETSI ETSI TS 101 952-3 V1.1.1 (2012-02)46.1.6 Option A and Option B as used for distributed filters 28g36.1.7 Correlation and trade-offs between filter requirements (for information) 28g36.2 DC requirements
16、 29g36.2.1 DC Insulation resistance between A-wire and B-wire 29g36.2.2 DC series resistance 29g36.2.3 DC signalling 29g36.3 Ringing frequency requirements 30g36.3.1 Ringing voltage drop at 25 Hz and 50 Hz . 30g36.3.2 ZInRingimpedance at 25 Hz and 50 Hz . 30g36.3.3 Total harmonic distortion at 25 Hz
17、 and 50 Hz 30g36.4 POTS pass band loss requirements (on-hook) 31g36.4.1 On-hook requirement for the case of high impedance termination . 31g36.4.2 On-hook requirement for the case of low impedance termination 31g36.5 POTS Pass band loss requirements (off-hook) . 32g36.6 POTS Passband return loss req
18、uirements (off-hook) . 33g36.6.1 Return loss requirements at the POTS port . 33g36.6.1.1 Return Loss at the POTS port for Option A . 33g36.6.1.2 Return Loss at the POTS port for Option B 34g36.6.2 Return Loss requirements at the LINE port Option A 34g36.6.2.1 Return Loss at the Line Port Option A fo
19、r Basic Filters . 34g36.6.2.2 Return Loss at the Line Port Option A for Standard Filters 35g36.6.2.3 Return Loss at the Line Port Option A for Enhanced Filters 35g36.6.3 Return Loss requirements at the LINE port Option B 36g36.6.3.1 Return Loss at the Line Port Option B for Basic Filters . 36g36.6.3
20、.2 Return Loss at the Line Port Option B for Standard Filters 37g36.6.3.3 Return Loss at the Line Port Option B for Enhanced Filters . 38g36.7 Requirements relating to metering pulses at 12 kHz or 16 kHz (optional). 38g36.8 Unbalance about Earth . 39g36.9 xDSL band requirements 39g36.9.1 xDSL band o
21、n-hook isolation between LINE and POTS port 40g36.9.2 xDSL band off-hook isolation between LINE and POTS port . 40g36.9.2.1 xDSL band off-hook loss requirements for basic filters 40g36.9.2.2 xDSL band off-hook loss requirements for standard filters 40g36.9.2.3 xDSL band off-hook loss requirements fo
22、r enhanced filters . 41g36.9.3 Transition band signal loss: IL between POTS port and LINE port (optional) . 41g36.9.4 xDSL signal loss: IL between LINE port and xDSL port . 41g36.10 Noise 41g36.10.1 POTS band audible noise level requirements . 42g36.10.2 xDSL band noise level 42g36.11 Distortion 42g
23、36.11.1 POTS band intermodulation distortion (optional) . 42g36.11.2 DSL band intermodulation distortion (optional) . 42g36.12 Group delay distortion 43g36.13 Requirements related to POTS transient effects (optional) 43g3Annex A (normative): Particular requirements for passive distributed filters 44
24、g3A.1 ZDSLand ZRefDSLfor specific xDSL over POTS variants 44g3A.1.1 Generic definition of ZDSL, using ZRefDSL, CDSLand LDSL. 44g3A.1.2 ZDSLfor ADSL over POTS . 45g3A.1.3 ZDSLfor European VDSL1 over POTS, with US0 starting at 25 kHz 45g3A.1.4 ZDSLfor VDSL2 over POTS with US0 . 45g3A.2 Common requirem
25、ents for passive distributed filters 46g3A.3 Specific requirements for passive filters for ADSL over POTS variants . 49g3A.4 Specific requirements for passive filters for VDSL1 over POTS variants . 49g3A.5 Specific requirements for passive filters for VDSL2 over POTS variants . 50g3Annex B (informat
26、ive): Evolution of the documents . 51g3Annex C (informative): Correlation and trade-offs between filter requirements 52g3ETSI ETSI TS 101 952-3 V1.1.1 (2012-02)5C.1 Detrimental effect of parallel distributed filters . 53g3C.2 Trade-off between properties in POTS band and xDSL band 55g3C.3 Strong IL
27、in the xDSL band affects POTS quality . 59g3C.4 Effects of parallel filters differ at POTS and LINE port 59g3C.5 The effects of absence of the xDSL impedance ZDSL. 60g3Annex D (informative): Intrinsic IL and RL caused by the ZDSLin the POTS band . 61g3Annex E (informative): IL Measurement from LINE
28、to xDSL inside ZDSL62g3Annex F (informative): Return Loss measurements: practical diagrams. 63g3Annex G (informative): Insertion Loss measured with feeding and loading bridges . 65g3Annex H (informative): Dynamic tests of distributed filters in the presence of xDSL transceivers . 67g3H.1 General Des
29、cription of TR-127 of the Broadband Forum 67g3H.2 Distributed filter tests in TR-127. . 67g3Annex I (informative): Optimal transmission of POTS and xDSL signals and their separation . 68g3Annex J (informative): More on feeding and loading bridges . 69g3Annex K (informative): Additional requirements
30、for Active Filters (F.F.S.) 70g3K.1 DC series resistance 70g3K.2 Bidirectional IL tests 70g3K.3 Noise measurements methods for active filters 70g3K.3.1 Psophometric noise in the POTS Band. 70g3K.3.2 Noise in the xDSL Band . 71g3K.4 On-hook loss requirements for dynamic or active filters . 71g3K.5 No
31、ise requirements for active filters 71g3K.5.1 POTS band audible noise level . 71g3K.5.2 xDSL band noise level . 71g3K.6 Distortion 71g3K.7 Transitional tests 71g3Annex L (informative): Amending the IL measurements for finite ZOnHo72g3Annex M (informative): Bibliography . 75g3History 76g3ETSI ETSI TS
32、 101 952-3 V1.1.1 (2012-02)6Intellectual 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 non-members, and can be found in ETSI SR 000
33、 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 ETSI Web server (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigat
34、ion, 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, or may be, or may become, essential to the present document. Foreword This Technical Specificati
35、on (TS) has been produced by ETSI Technical Committee Access, Terminals, Transmission and Multiplexing (ATTM). The present document is part 3 of a multi-part deliverable covering Access network xDSL transmission filters, as identified below: Part 1: “Generic specification of xDSL over POTS splitters
36、“; Part 2: “Generic specification of xDSL over ISDN splitters and xDSL universal splitters“; Part 3: “Generic specification of static distributed filters for xDSL over POTS“; Part 4: “Additional specifications for dynamic distributed filters for xDLS over POTS (under study)“. NOTE 1: The present doc
37、ument is derived from previous specifications of distributed filters for ADSL over POTS. Before the publication of the 3 (or 4) parts as described above, the TS 101 952 was composed of 2 parts, which discriminated between ADSL and VDSL, with several subparts. For reasons of simplicity the TS is now
38、restructured as a set of only 3 (potentially 4) documents, intended for both ADSL and VDSL when applicable. The older structure of the documents is explained in the informative Annex B. NOTE 2: Useful information on splitter tests also applicable to distributed filters may be found in TR 101 953-1-1
39、 i.3 and TR 101 953-2-1 i.5. These documents are linked to the previous versions of the splitter specifications. i.3 and i.5 e.g. describe the combination of the AC testing conditions of the test set-ups with the DC conditions controlled via feeding and loading bridges. If there is a discrepancy bet
40、ween the present document and the TR 101 953 series of documents i.3 to i.8, the present document prevails. NOTE 3: The use of distributed filters is not recommended for VDSL, but it is not excluded. For this reason the parts 3 and 4 refer to distributed filters for xDSL and not just for ADSL. NOTE
41、4: In the present document we introduce three classes of filters: basic, standard and enhanced. The reasoning behind this approach is clarified in Clause 6.1.1. NOTE 5: When multiple distributed filters are installed in parallel the quality of the POTS band signals tend to degrade proportionally to
42、the number of filters placed at the customers premises. This effect is explained in Clause C.1. This degradation effect is worse if multiple distributed filters of basic quality are used, or filters that only fulfil the previous published requirement (TS 101 952-1-5 (V1.2.1) i.17). In that case also
43、 the DSL signals can potentially be degraded. The latter is further addressed in the informative Annex B. The present document is fully in line with initiative “eEurope 2002 - An Information Society For All“, under “The contribution of European standardization to the eEurope Initiative, A rolling Ac
44、tion Plan“ especially under the key objective of a cheaper, faster and secure Internet. ETSI ETSI TS 101 952-3 V1.1.1 (2012-02)7Introduction Remarks and limitations of the present document. The present document covers all xDSL system variants, such as ADSL1, ADSL2, ADSL2plus, VDSL1 and VDSL2. It is
45、applicable at only at the Terminal Equipment (TE) (i.e. user) side of the line. There is no equivalent of the distributed filter at the CO side. The CO side central splitter requirements for xDSL over POTS splitters are in TS 101 952-1 11. The present document is derived from previous specifications
46、 of distributed filters for ADSL over POTS, and it corrects the errors of the older versions as explained in Annex B. It now contains measurements and requirements for the combined effect when multiple distributed filters are deployed in parallel. A number of limitations and remarks of the present d
47、ocument should be listed: 1) Originally the present document was limited to distributed filters for ADSL. It is now extended to cover also distributed filters for VDSL. In the ITU-T documents a warning note is recommending not to use distributed filters for VDSL. E.g. see note 7 of section 5.4 of G.
48、993.2 i.13). However, if distributed filters are used in VDSL2 scenarios to achieve a faster and cheaper deployment of service, operators should realize that this could prevent VDSL to attain its maximum theoretical transmission performances, and that ERM/EMC problems of the VDSL could worsen. 2) Th
49、e present document covering xDSL over POTS distributed filters was gained from the experience with passive and static DSL splitters, the original state of the art for this application. Therefore, the requirements in the present document are primarily intended for passive and static distributed filters at the TE side only. 3) There are other classes of filters possible, besides passive and static splitters. Such active and/or dynamic filters are composed of other elements than passive components. Active/dynamic splitters require different and additional requi
