1、ETSI TS 101 952-1-4 1.1.1 (2002-11) Technical Specificafion Access network xDSL transmission filters; Part 1 : ADSL splitters for European deployment; Sub-part 4: Specification of ADSL over “ISDN or POTS“ universal splitters 2 ETSI TS 101 952-1-4 V1.l.l (2002-11) Reference DTS/AT-O1 O1 05-01 -04 Key
2、words ADSL, POTS, ISDN, 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 c
3、opies of 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 Form
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5、tatus of 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
6、 restriction 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 ET
7、SI 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 3 ETSI TS 101 952-1-4 V1.l.l (2002-11) Contents Intellectual Property Rights . .4 Foreword . 4 1 2 3 3.1 3.2 4 4.1 5 5.1 5.1.1 5.1.2 5.2 5.2.1 5.2
8、.2 5.2.3 5.2.4 5.2.5 5.3 6 6.1 6.1.1 6.1.2 6.1.3 6.2 6.3 6.3.1 6.3.2 6.3.3 6.4 6.4.1 6.4.2 6.5 6.6 6.7 6.7.1 6.8 6.8.1 6.8.2 6.9 6.9.1 6.10 Scope 5 References . .5 Definitions and abbreviations. . .6 Definitions 6 Abbreviations . 6 ers. .6 Functional diagram . 7 Testing conditions . .8 General funct
9、ional description of ADS DC testing conditions . Polarity independence . DC feeding current Terminating Impedances . . z- . 9 Splitter requirements 1 O . 10 . 10 10 10 11 11 11 11 12 12 12 13 14 General transmission test set-up DC requirements . 10 DC resistance to earth . DC Insulation resistance b
10、etween A-wire and B-wire DC series resistance High pass path of the splitter Pass band loss requirements . Off-hook pass band insertion loss . Off-hook passband insertion loss di Passband insertion loss for ISDN . Passband return loss requirements. . Passband return loss for POTS . Passband return l
11、oss for ISDN Requirements relating to metering pulses at 12 kHz or 16 kHz . 13 Unbalance about Earth . ADSL band loss requirements Isolation requirements . Noise . Audible noise . ADSL band noise level requirements . Intermodulation distortion POTS band intermodul n requirements . Delay distortion .
12、 6.10.1 POTS band delay distortion , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , . , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 6.10.2 ISDN band delay distortion . 6.1 1 ADSL related requirem
13、ents . 6.11.1 ADSL insertion loss . 6.12 Requirements related to effects . Annex A (informative): Bibliography . 19 History . .20 ETSI 4 ETSI TS 101 952-1-4 V1.l.l (2002-11) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. T
14、he 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 Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available fr
15、om 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 carried 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
16、 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 4 of a multi-part deliverable covering Access net
17、work xDSL transmission filters, as identified below: Part 1: “ADSL splitters for European deployment“; Sub-part 1: Sub-part 2: Sub-part 3: Sub-part 4: Sub-part 5: “Specification of the low pass part of ADSL/POTS splitters“; “Specification of the high pass part of ADSL/POTS splitters“; “Specification
18、 of ADSL/ISDN splitters“; “Specification for ADSLPISDN or POTS“ universal splitters“; “Specification for ADSL/POTS distributed filters“. Part 2: NOTE: “VDSL splitters for European deployment“. The choice of a multi-part format for the present document is to facilitate maintenance and future enhancem
19、ents. 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 objective of a cheaper, faster and secure Internet. ETSI 5 ETSI
20、TS 101 952-1-4 V1.l.l (2002-11) 1 Scope The present document specifies requirements and test methods for ADSL over“1SDN or POTS“ universal splitters. This means that the splitter shall support either POTS or ISDN transmission underlying the broadband ADSL. This ADSL is as defiied in annex B of ITU-T
21、 Recommendation G992.1 6. These splitters are intended to be installed at the Local Exchange side of the local loop and at the user side near the NTP. The splitter filter as specified by the present document, may be implemented as an independent unit, separately from the ADSL transceiver, or may be
22、integrated with the ADSL termination unit. The splitter may also be integrated with the baseband termination unit (e.g. POTS line card or ISDN transceiver), however this is outside of the scope of the current document. 2 Re fe re n ces The following documents contain provisions which, through refere
23、nce 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. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version ap
24、plies. il ETSI TS 102 080: “Transmission and Multiplexing (TM); Integrated Services Digital Network (ISDN) basic rate access; Digital transmission system on metallic local lines“. ETSI TR 101 728: “Access and Terminals (AT); Study for the specification of low pass section of POTS/ADSL splitters“. IT
25、U-T Recommendation 0.9: “Measuring arrangements to assess the degree of unbalance about earth“. 21 31 41 51 ITU-T Recommendation 0.41 : “Psophometer for use on telephone-type circuits“. ITU-T Recommendation 0.42: “Equipment to measure non-linear distortion using the 4-tone intermodulation method“. 6
26、1 71 ITU-T Recommendation G.992.1: “Asymmetric Digital Subscriber Line (ADSL) transceivers“. 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 P
27、oint (NTP)“. ETSI TBR 02 1 : “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
28、 Tone Multi Frequency (DTMF) signalling“. SI ETSI TR 102 139: “Compatibility of POTS terminal equipment with xDSL systems“. ITU-T Recommendation G. 122: “Influence of national systems on stability and talker echo in international connections“. ETSI 6 ETSI TS 101 952-1-4 V1.l.l (2002-11) 3 3.1 Defini
29、tions 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 signature network circuitry included at the POTS port of the splitter, the va
30、lues and configuration of which may be operator dependent, which has the purpose of enabling network operators remote line testing equipment to determine the presence of a splitter on a line Echo Return Loss (ERL): return loss averaged with l/f power weighting over the telephone band (300 Hz to 3 40
31、0 Hz), in accordance with clause 4 of ITU-T Recommendation G. 122. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ADSL DC ISDN (BRA) ITU LE NTP POTS TE Asymmetric Digital Subscriber Line Direct Current Integrated Services Digital Network (Basic Rate Ac
32、cess) International Telecommunication Union Local Exchange (Central Office) Network Termination Point Plain Old Telephone Service Terminal Equipment (e.g. telephone, fax, voice band modem etc.) 4 General functional description of ADSL over “ISDN or POTS“ universal splitters The main purpose of the A
33、DSL over“1SDN or POTS“ universal splitter is to separate the transmission of either baseband POTS or ISDN signals and broadband ADSL signals, enabling the simultaneous transmission of the two services on the same twisted pair. The splitter also serves to protect POTS or ISDN from interference due to
34、 egress (and ingress) from ADSL signals. Equally it protects the ADSL transmission from ISDN intereference, and transients generated primarily during POTS signalling (dialling, ringing, ring trip, etc.). It must also prevent interference to the ADSL service due to fluctuations in impedance and linea
35、rity that occur when POTS telephones change operational state (e.g. from off-hook to on-hook). Use of such a universal splitter is considered to be only advantageous in areas where there exists a prevailing deployment of ISDN BRA. Insertion of a splitter filter in existing lines shall only have a lo
36、w impact on the performance of existing services. ETSI 4.1 7 ETSI TS 101 952-1-4 V1.l.l (2002-11) Functional diagram The functional diagram for the splitter combination is given in figure 1. The “ISDN or POTS“ port of the splitter is referred to as the “TELE“ port. l n- I U POTS or ISDN ADSL POTS or
37、 ISDN 88 TE-side (Customer Premises) I,“ ADSL transceiver LE-side ,“ (Central Office) or (Optical network unit) ADSL transceiver Figure 1 : Functional diagram of the ADSLI“ISDN or POTS“ splitter configuration The transfer functions between the different ports of the splitter can be understood as fol
38、lows: The transfer function from port “TELE“ to “LINE“ and vice-versa is that of a low-pass filter. A high level of isolatiori is required from port “ADSL“ to “TELE“ to prevent undesirable interaction between DSL and baseband services. The transfer function from the ADSL port to the line port and vi
39、ce-versa will be that of a first order high-pass filter (i.e. blocking capacitors). NOTE: The splitters designed according to the present document are expected to be adequate under a wide range of operational conditions. The issue of general interoperability between ISDN equipment and splitters is f
40、or further study. CB -1 (Mandatory Blocking 1- cg capacitors) ADSL PORT Figure 2: Structure of the ADSLI“ISDN or POTS“ filter ETSI 8 ETSI TS 101 952-1-4 V1.l.l (2002-11) 5 5.1 Testing conditions DC testing conditions 5.1.1 Polarity independence The splitter shall conform to all the applicable requir
41、ements of the present document for both polarities 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 current Applicable requirements shall be
42、met with a DC current of O mA to 80 mA. 5.2 Terminating Impedances In many of the tests with ISDN-BA frequencies, the ADSL port of the splitter is terminated with an impedance called Z,. This impedance model as shown in figure 3, represents the input impedance of the ADSL transceiver as seen from th
43、e ADSL port of the splitter, and does not include the blocking capacitors. The model is intended for splitter specification in the context of the present document. The purpose of this model impedance is for splitter specification, it is not a requirement on the input impedance of the ADSL transceive
44、r. C = 41,8nF -1- C = 41,8nF nF NOTE: ZADSL-, does not include the blocking capacitors CB. Figure 3: Schematic diagram of the impedance ZADSL-I for verifying requirements of the splitter 5.2.2 ZIsDN For requirements relating to ISDN band frequencies described in the present document, the terminating
45、 impedance ZI, is used to terminate the ISDN port. ZI, shall follow the definition of TS 102 O80 i, annex B for 4B3T (1 50 Q) ISDN-BA. NOTE: 2B1Q is for fwther study. 5.2.3 ZL ZL is used to terminate the LINE port at high frequencies and shall be equal to 100 Q. NOTE: This impedance value is for fwt
46、her study. ETSI 9 Line ETSI TS 101 952-1-4 V1.l.l (2002-11) TELE z Meter Pod (load) wx 5.2.4 ZR(POTS)Q When the splitter is to be used for POTS, the terminating impedances ZR as defined in ES 201 970 7 and TBR 021 SI is used. This impedance is specified in figure 4. The impedance of figure 4 can be
47、used to terminate both the LINE port at low frequencies, and the TELE port. 150 nF Figure 4: Schematic diagram of the impedance ZR NOTE: In the case of splitters to be deployed by some network operators, alternative models of reference impedances instead of ZR are currently used when matching the sp
48、litter requirements. For requirements relating to ADSL frequencies described in the present document, the terminating impedance Z, is used to terminate POTS and line ports of the low pass filter. This is the European harmonized complex impedance Z, with the modification proposed in TR 102 139 9. Thi
49、s network is shown in figure 5. 120Q 150Q 750Q -GzT 47nF 150nF Figure 5: Impedance Z, 5.3 General transmission test Set-up For many of the transmission related tests that are specified in the present document, a common general test setup is valid. This test set-up is given in figures 6 and 7, for measurements at the LINE port and TELE port respectively. S p I itte r c Signal source tS Figure 6: Test set up for transmission testing from LINE to TELE ETSI 10 ETSI TS 101 952-1-4 V1.l.l (2002-11) TELE Line z Meter Pod Pod (load) R/x Figure 7: Test set up
