1、 ETSI TS 101 952-1-5 V1.2.1 (2006-10)Technical Specification Access network xDSL transmission filters;Part 1: ADSL splitters for European deployment;Sub-part 5: Specification for ADSL overPOTS distributed filtersETSI ETSI TS 101 952-1-5 V1.2.1 (2006-10) 2 Reference RTS/AT-010125-01-05 Keywords ADSL,
2、 POTS, splitter 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 enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the presen
3、t document can be downloaded from: http:/www.etsi.org The present document may be made available 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
4、 dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a 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 ot
5、her ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors 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 b
6、y written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2006. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON l
7、ogo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 101 952-1-5 V1.2.1 (2006-10) 3 Contents Intellectual Property Rights5 Foreword.5 1 Sco
8、pe 6 2 References 6 3 Definitions and abbreviations.7 3.1 Definitions7 3.2 Abbreviations .7 4 General functional description of ADSL over POTS distributed filters 8 4.1 Functional diagram.8 5 Testing conditions 9 5.1 DC testing conditions .9 5.1.1 Polarity independence.9 5.1.2 DC feeding conditions
9、(on/off hook)9 5.2 AC Terminating impedances10 5.2.1 ZDSL10 5.2.2 ZRand ZSL.10 5.2.3 ZRHF11 5.2.4 ZONHI11 5.3 General transmission test setup 11 6 Distributed filter requirements .13 6.1 Options for filter requirements .13 6.1.1 Option A distributed filters .13 6.1.2 Option B distributed filters .13
10、 6.2 DC requirements 13 6.2.1 DC resistance to earth.13 6.2.2 DC Insulation resistance between A-wire and B-wire14 6.2.3 DC series resistance14 6.2.4 DC signalling14 6.3 Ringing frequency requirements 14 6.3.1 Voltage drop at 25 Hz and 50 Hz14 6.3.2 Impedance at 25 Hz and 50 Hz.15 6.3.3 Total harmon
11、ic distortion at 25 Hz and 50 Hz15 6.4 POTS Pass band loss requirements (on-hook)15 6.4.1 On hook requirement for the case of high impedance load.15 6.4.2 On hook requirement for the case of low impedance load15 6.4.2.1 On-hook POTS insertion loss15 6.4.2.2 On-hook POTS insertion loss distortion .16
12、 6.5 POTS Pass band loss requirements (off-hook).16 6.5.1 Off-hook POTS pass band insertion loss 16 6.5.2 Off-hook POTS passband insertion loss distortion.16 6.6 POTS Passband return loss requirements (off-hook) .16 6.6.1 Return loss requirements Options A and B.17 6.6.1.1 Return loss requirements,
13、Option A17 6.6.1.2 Return loss requirements, Option B 17 6.7 Requirements relating to metering pulses at 12 kHz or 16 kHz .17 6.8 Unbalance about Earth .18 6.9 ADSL band requirements.19 6.9.1 On-hook loss.19 6.9.2 Off-hook isolation.20 6.9.3 Line side impedance in the ADSL band .21 6.10 Noise 21 6.1
14、0.1 Audible noise level .21 ETSI ETSI TS 101 952-1-5 V1.2.1 (2006-10) 4 6.10.2 ADSL band noise level .21 6.11 Distortion22 6.11.1 POTS band intermodulation distortion .22 6.12 Group delay distortion22 6.13 Requirements related to POTS transient effects.22 6.14 Line side impedance in the POTS band (o
15、n Hook) 22 Annex A (informative): Test related to POTS transient effects .23 Annex B (informative): Bibliography.24 History 25 ETSI ETSI TS 101 952-1-5 V1.2.1 (2006-10) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The
16、information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from
17、 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 by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI
18、 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 Specification (TS) has been produced by ETSI Technical Committee Access and Terminals (AT). The present document is part 1, sub-part 5 of a multi-part d
19、eliverable covering Access network xDSL transmission filters, as identified below: Part 1: “ADSL splitters for European deployment“:Sub-part 1: “Generic specification of the low pass part of DSL over POTS splitters including dedicated annexes for specific xDSL variants“; Sub-part 2: “Specification o
20、f the high pass part of ADSL/POTS splitters“; Sub-part 3: “Specification of ADSL/ISDN splitters“; Sub-part 4: “Specification of ADSL over “ISDN or POTS“ universal splitters“; Sub-part 5:“Specification for ADSL over POTS distributed splitters“; Part 2: “VDSL splitters for European deployment“. NOTE 1
21、: The choice of a multi-part format for the present document is to facilitate maintenance and future enhancements. NOTE 2: We recommend to use the present document together with the document on splitter tests TR 101 953-1-1 (see Bibliography). The present document is fully in line with initiative “e
22、Europe 2002 - An Information Society For All“, under “The contribution of European standardization to the eEurope Initiative, A rolling Action Plan“ especially under the key objective of a cheaper, faster and secure Internet. ETSI ETSI TS 101 952-1-5 V1.2.1 (2006-10) 6 1 Scope The present document s
23、pecifies requirements and test methods for “ADSL over POTS“ distributed filters. These filters are at the user side of the local loop in the customer premise. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
24、 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. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly
25、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. 1 ETSI TBR 038: “Public Switched Telephone Network (PSTN); Attachment require
26、ments for a terminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected to the analogue interface of the PSTN in Europe“. 2 ITU-T Recommendation O.42: “Equipment to measure non-linear distortion using the 4-tone intermodulation method
27、“. 3 ETSI ES 203 021 (all parts): “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 ITU-T Recommendation O.41: “Psophometer
28、for use on telephone-type circuits“. 5 ITU-T Recommendation O.9: “Measuring arrangements to assess the degree of unbalance about earth“. 6 ETSI TS 101 270-1: “Transmission and Multiplexing (TM); Access transmission systems on metallic access cables; Very high speed Digital Subscriber Line (VDSL); Pa
29、rt 1: Functional requirements“. 7 ETSI ES 201 970: “Access and Terminals (AT); Public Switched Telephone Network (PSTN); Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented Network Termination Point (NTP)“. 8 ETSI EN 300 659-1: “Access and Terminals (AT
30、); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 1: On-hook data transmission“. 9 ETSI ES 200 778-1: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); P
31、rotocol over the local loop for display and related services; Terminal equipment requirements; Part 1: On-hook data transmission“. 10 ETSI ES 201 729: “Public Switched Telephone Network (PSTN); 2-wire analogue voice band switched interfaces; Timed break recall (register recall); Specific requirement
32、s for terminals“. 11 ETSI ES 201 187: “2-wire analogue voice band interfaces; Loop Disconnect (LD) dialling specific requirements“. ETSI ETSI TS 101 952-1-5 V1.2.1 (2006-10) 7 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definition
33、s apply: A-wire and B-wire: wires in the 2-wire local loop connection provided from the exchange to the NTP active filters: filters whose filtering function is implemented using some active components, not including exclusively passive filter implementations containing line state detection circuitry
34、 central splitter: splitter that is used to isolate ADSL frequencies from POTS frequencies at a single point at the customer premises (master splitter) distributed filter: low pass filter that is added in series with each of the parallel POTS TE NOTE: Each of these parallel connected filters (in the
35、 in-house cabling) is known as a distributed filter. These filters are also known as In-line filters or microfilters. dynamic filters: filters whose transfer function varies significantly depending on some external influence (e.g. the presence of line current) far end echo: speech that is fed back t
36、o the talker in a telephony connection with a round trip delay (i.e. the delay between talking and hearing the feedback), of greater than 5 ms, resulting in a distinguishable echo off-hook: state of the POTS equipment at either end of a loop connection when the NTP terminal equipment is in the stead
37、y loop state NOTE: See TBR 021 3. on-hook: state of the POTS equipment at either end of a POTS loop connection when the NTP terminal equipment is in the quiescent state NOTE 1: See TBR 021 3. NOTE 2: In the case where there are multiple TE present at the customer end of the loop, then only when all
38、of these are on-hook will the TE be considered to be on hook from the perspective of testing the splitter. passive filters: filters containing exclusively passive components sidetone: speech that is fed back to the talker in a telephony connection with a round trip delay (i.e. the delay between talk
39、ing and hearing the feedback), of less than approximately 5 ms, making it indistinguishable from the original utterance signature network: circuitry included at the POTS port of the splitter, the values and configuration of which may be operator dependent, which has the purpose of enabling network o
40、perators remote line testing equipment to determine the presence of a splitter on a line static filters: filters whose transfer function does not display significant dependence on external influences (e.g. the presence of line current). These filters are known as single state filters. 3.2 Abbreviati
41、ons For the purposes of the present document, the following abbreviations apply: AC Alternating Current ADSL Asymmetric Digital Subscriber Line CLI Caller Line Identification DC Direct Current DSL Digital Subscriber Line DTMF Dual Tone Multi-Frequency DUT Device Under Test ETSI ETSI TS 101 952-1-5 V
42、1.2.1 (2006-10) 8 HPF High Pass Filter ITU International Telecommunication Union NTP Network Termination Point POTS Plain Old Telephone Service PSTN Public Switched Telephone Network TE Terminal Equipment (e.g. Telephone, Fax, voice band modem etc.) THD Total Harmonic Distortion VDSL Very high speed
43、 Digital Subscriber Line 4 General functional description of ADSL over POTS distributed filters The main purpose of the ADSL over POTS distributed filter is to protect voice band terminal equipment from interference due to egress (and ingress) from DSL signals. Equally it protects the DSL transmissi
44、on from transients generated primarily during POTS signalling (dialling, ringing, ring trip, etc.), and it must also prevent interference to the ADSL service due to fluctuations in impedance and linearity that occur when telephones change operational state (e.g. from off-hook to on-hook). The differ
45、ences between a distributed filter and a central splitter (the latter being specified in sub-part 1-1 of TS 101 952) are defined more by the location of the filter rather than the function. Central splitters are designed to be located at the demarcation point of the customer premise, and provide sep
46、aration of POTS and ADSL signals at a single location. Distributed filters on the other hand are placed in series with each piece of voice grade terminal equipment. Thus distributed filters are two port devices, as seen in figure 1 (central splitters have three ports). Hence, when voice grade equipm
47、ent is protected by distributed filters the ADSL signals are delivered over the entire customer premise wiring. Multiple filters will typically be used in a customer premises, as shown in figure 1. NOTE: The quality of the POTS and the ADSL services may be negatively affected by the number of distri
48、buted filters installed. The extent of this effect is expected to be proportional to the number of distributed filters installed. The distributed filters are intended to be a convenient solution that can be installed by the user. The performance of both the POTS and ADSL services is often reduced by
49、 using distributed filters instead of a central splitter. The central splitter almost always ensures a higher input impedance for the ADSL frequency band at the line port than the distributed filters in parallel. Moreover, in the ADSL band the central splitter isolates the in-house wiring from the external line and the ADSL system and will almost certainly reduce electromagnetic interference. It is recognized that dynamic distributed filters can give improved performance over static filters, requirements for dynamic filters will be covered in th
