1、ETSI TS I01 952-2-1 1.1.1 (2002-11) Technical Specificafion Access network xDSL transmission filters; Part 2: VDSL splitters for European deployment; Sub-part 1: Specification of the low pass part of VDSL/POTS splitters 2 ETSI TS 1 O1 952-2-1 VI .I .I (2002-1 1) Reference DTS/AT-O1 O1 05-02-01 Keywo
2、rds VDSL, POTS, splitter ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of
3、 the present document can be downloaded from: http:lwmv.etsi .arq 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)
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5、 this and other ETSI documents is available at ha p:/pa rta I. etsi I a rgltbistat uslstatus .as p If you find errors in the present document, send your comment to: Cori vriaht Notifica tion No part may be reproduced except as authorized by written permission. The copyright and the foregoing restric
6、tion extend to reproduction in all media. O European Telecommunications Standards Institute 2002. All rights reserved. DECTTM, PLUGTESTSTMand UMTSTMare Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for t
7、he 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 3 ETSI TS 1 O1 952-2-1 VI .I .I (2002-1 1) Contents Intellectual Property Rights . .5 Foreword . 5 1 Scope 6 2 References . .6 3 Definitions and abbreviat
8、ions. . .7 Definitions 7 3.1 3.2 Abbreviations . 7 4 General functional description of DSL over POTS splitters 8 4.1 Functional diagram . 8 5 5.1 5.1.1 5.1.2 5.2 5.2.1 5.2.2 5.2.3 5.2.4 5.3 Testing conditions . .9 DC testing conditions . Polarity independence . 9 Terminating impedances . ZvDsL-l and
9、 ZWSL- ZR andZ ,. . z- . . ZON . General transmission . 9 DC feeding conditions (odoff hook) . 6 Splitter requirements 12 6.1 6.1.1 6.1.2 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.3 6.3.1 6.3.2 6.3.3 6.4 6.4.1 6.4.2 6.4.2.1 6.4.2.2 6.5 6.5.1 6.5.2 6.6 6.6.1 6.6.1.1 6.6.1.2 6.7 6.8 6.9 6.9.1 6.9.2 6.10 6.10.1 6.
10、10.2 6.11 Options for splitter requirements DC requirements 13 12 13 13 13 13 13 14 14 14 14 Option A splitters Option B splitters DC resistance to earth DC Insulation resistance between DC series resistance DC signalling 14 Ringing frequency requirements Voltage drop at 25 Hz and 50 Hz Impedance at
11、 25 Hz and 50 Hz . Total harmonic distortion at 25 Hz Pass band loss requirements (on-hoo On hook requirement for the cas On hook requirement for the cas On-hook insertion loss On-hook insertion loss Pass band loss requirements (off- Off-hook pass band insertion Off-hook passband insertion 1 Passban
12、d return loss requirement Return loss requirements opti Return loss requirements, Return loss requirements, Requirements relating to meteri Unbalance about Earth . VD S L band requirements . On-hook loss for VDSL over POTS splitters Off-hook isolation . Noise Audible noise level . VDSL band noise le
13、vel . Distortion ETSI 4 ETSI TS 1 O1 952-2-1 VI . 1 . 1 (2002-1 1) 6.11.1 6.12 6.13 POTS band intermodulation distortion . 21 Group delay distortion 22 Requirements related to POTS transient effects . 22 Annex A (informative): Bibliography . 23 History 24 ETSI 5 ETSI TS 1 O1 952-2-1 VI .I .I (2002-1
14、 1) Intellectual 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 O00 3 14: “Intellectual Pro
15、perty Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (5). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carr
16、ied out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR O00 3 14 (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 Technic
17、al Committee Access and Terminals (AT). The present document is part 2, sub-part 1 of a multi-part deliverable covering Access network xDSL transmission filters, as identified below: Part 1 : Part 2: “ADSL splitters for European deployment“; “VDSL splitters for European deployment“; Sub-part 1: Sub-
18、part 2: Sub-part 3: Sub-part 4: “Specification of the low pass part of VDSL/POTS splitters“; “Specification of the high pass part of VDSL/POTS splitters“; “Specification of VDSL/ISDN splitters“; “Specification of VDSL/“Other services“ splitters“. NOTE: The choice of a multi-part format for the prese
19、nt document is to facilitate maintenance and future enhancements. 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 Action Plan“ especially under the key obje
20、ctive of a cheaper, faster and secure Internet. ETSI 6 ETSI TS 1 O1 952-2-1 VI .I .I (2002-1 1) 1 Scope The present document specifies requirements and test methods for the low pass part of “VDSL over POTS“ splitters. These splitters are intended to be installed at the Local Exchange side of the loc
21、al loop and at the user side near the NTP. In the case of splitters at the user side, the present document specifies the master splitter that is intended for use at the demarcation point of the customer premises. Distributed splitters are not within the scope of the present document. The splitter fi
22、lter, as specified by the present document, may be implemented as an independent unit, separately from the DSL transceiver, or may be integrated with the DSL termination unit. The splitter may also be integrated with the baseband termination unit (e.g. POTS line card), however this is outside of the
23、 scope of the current document. 2 Re fe re n ces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication andor edition number or version number) or non-specific.
24、 For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. il ETSI TBR 038: “Public Switched Telephone Network (PSTN); Attachment requirements for a terminal equipment incorporating an analogue handset function capable of supporting the ju
25、stified case service when connected to the analogue interface of the PSTN in Europe“. ETSI TR 102 139: “Compatibility of POTS terminal equipment with xDSL systems“. ITU-T Recommendation 0.42: “Equipment to measure non-linear distortion using the 4-tone intermodulation method“. 21 31 41 ETSI TBR 02 1
26、 : “Terminal Equipment (TE); Attachment requirements for pan-European approval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE (excluding TE supporting the voice telephony service) in which network addressing, if provided, is by means of Dual Tone Multi Frequency (DTM
27、F) signalling“. ETSI TR 101 728: “Access and Terminals (AT); Study for the specification of low pass section of POTS/ADSL splitters“. ITU-T Recommendation 0.41 : “Psophometer for use on telephone-type circuits“. ITU-T Recommendation 0.9: “Measuring arrangements to assess the degree of unbalance abou
28、t earth“. 51 61 71 SI ETSI TS 101 270-1: “Transmission and Multiplexing (TM); Access transmission systems on metallic access cables; Very high speed Digital Subscriber Line (VDSL); Part 1 : Functional requirements“. ETSI ES 201 970: “Access and Terminals (AT); Public Switched Telephone Network (PSTN
29、); Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented Network Termination Point (NTP)“. ETSI EN 300 659: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for displ
30、ay (and related) services“. 91 lo1 i 11 ETSI ES 200 778: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Protocol over the Local loop for display and related services; Terminal equipment requirements“. ETSI 7 ETSI TS 1 O1 952-2-1 VI .I .I (2002-1 1) 121 E
31、TSI ES 201 729: “Public Switched Telephone Network (PSTN); 2-wire analogue voice band switched interfaces; Timed break recall (register recall); Specific requirements for terminals“. ETSI ES 201 187: “2-wire analogue voice band interfaces; Loop Disconnect (LD) dialling specific requirements“. i31 3
32、3.1 Definitions and abbreviations De fi nit ions For the purposes of the present document, the following terms and definitions apply: A-wire and B-wire: wires in the 2-wire local loop connection provided from the exchange to the NTP distributed filter: a low pass filter that is added in series with
33、each of the parallel POTS TE. NOTE: Each of these parallel connected filters (in the in-house cabling) is known as a distributed filter. These filters are also known as In-line filters or microfilters. far end echo: speech that is fed back to the talker in a telephony connection with a round trip de
34、lay (i.e. the delay between talking and hearing the feedback), of greater than 5 m, 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 steady loop state NOTE: See TBR 021 4. on-hook state of the POTS e
35、quipment at either end of a POTS loop connection when the NTP terminal equipment is in the quiescent state NOTE 1: NOTE 2: See TBR 021 4. In the case where there are multiple TE present at the customer end of the loop, then only when all of these are on-hook shall the TE be considered to be on hook
36、from the perspective of testing the splitter. sidetone: speech that is fed back to the talker in a telephony connection with a round trip delay (i.e. the delay between talking and hearing the feedback), of less than approximately 5 m, making it indistinguishable from the original utterance signature
37、 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 operatorts remote line testing equipment to determine the presence of a splitter on a line 3.2 Abbreviations For the purposes of th
38、e present document, the following abbreviations apply: AC CLI CO DC HPF ITU LE NTP POTS PSTN TE THD VDSL Alternating Current Caller Line Identification Central Office (Local Exchange) Direct Current High Pass Filter International Telecommunication Union Local Exchange (Central Office) Network Termin
39、ation Point Plain Old Telephone Service Public Switched Telephone Network Terminal Equipment (e.g. Telephone, Fax, voice band modem etc.) Total Harmonic Distortion Very high speed Digital Subscriber Line ETSI 8 ETSI TS 1 O1 952-2-1 VI .I .I (2002-1 1) 4 General functional description of DSL over POT
40、S s p I i tte rs The main purpose of the DSL over POTS splitter is to separate the transmission of POTS signals and DSL signals, enabling the simultaneous transmission of both services on the same twisted pair. The splitter also serves to protect POTS from interference due to egress (and ingress) fr
41、om DSL signals. Equally it protects the DSL transmission from transients generated primarily during POTS signalling (dialling, ringing, ring trip, etc.), and it must also prevent interference to the DSL service due to fluctuations in impedance and linearity that occur when telephones change operatio
42、nal state (e.g. from off-hook to on-hook). Information on various implementations of DSL over POTS splitters is given in TR 101 728 5. Insertion of a splitter filter in existing POTS lines shall only have a low impact on the performance of this service. 4.1 Functional diagram The functional diagram
43、for the splitter combination is given in figure 1. POTS TE POTS CO terminal LE-side o (Central Ofpee) or (Optical network unit) DSL transceiver TE-side (Customer Premises) o DSL transceiver Figure 1: Functional diagram of the DSL splitter configuration The transfer functions between the different po
44、rts of the splitter can be understood as follows: - - The transfer function from the POTS port to the LINE port and vice-versa is that of a low-pass filter. A high level of isolation is required from the DSL port to the POTS port to prevent undesirable interaction between the DSL transmission and an
45、y existing narrowband services. The transfer function from the DSL port to the LINE port and vice-versa is either that of a high-pass filter, or it may be all pass in nature, in the case where the full high pass filter function is implemented in the DSL transceiver (see 2 of TS 101 952-1-2). - ETSI
46、9 ETSI TS 1 O1 952-2-1 VI .I .I (2002-1 1) $ (Optional High Pass) DSL PORT Figure 2: Structure of the DSL splitter filter 5 5.1 Testing conditions DC testing conditions 5.1.1 Polarity independence The splitter shall conform to all the applicable requirements of the present document for both polariti
47、es of the DC line feeding voltage (and the DC line current) provided by the local exchange. This may not apply in the case where a “signature network“ is used as this may be polarity dependant. 5.1.2 DC feeding conditions (on/off hook) The electrical requirements in the present document can be class
48、ified as follows: On-hook requirements, when the POTS terminal equipment is in the on-hook state. Off-hook requirements, when the POTS terminal equipment is in the off-hook state. Transitional requirements, when the POTS terminal equipment is in the transition between the on-hook and off-hook state
49、(in either sense). On-hook voiceband electrical requirements shall be met with a DC feeding voltage of 50 V, and using the impedance model Zo, as given in clause 5.2.4 of the present document. Additionally in certain networks there may be on-hook signalling requiring a DC loop current in the range of 0,4 mA to 2.5 mA flowing through the distributed filter. In this case an impedance model of 600 i2 is used to terminate the LINE and POTS port of the distributed filter at voice frequencies. Off-hook electrical requirements shall be met with a DC current of 13 mA
