1、ETSI TS 1 O 1 952-1 -3 VI .I .I (2002-05) Technical Specificafion Access network xDSL transmission filters; Part 1 : ADSL splitters for European deployment; Sub-part 3: Specification of ADSLASDN splitters 2 ETSI TS 101 952-1-3 VI .I .I (2002-05) Reference DTS/TM-06028-1-3 Keywords ADSL, ISDN, splitt
2、er 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 the present document
3、can be downloaded from: http:/w.etsi.orq 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 dispute, the
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5、ments is available at hp:l/partal.etsi.arltb/saslsaus.asp 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 restriction extend to reproduction in all media.
6、 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 the benefit of its Members. 3GPPTM is a Tr
7、ade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI TS 101 952-1-3 VI .I .I (2002-05) Contents Intellectual Property Rights . . . . 4 Foreword 1 Scope . 2 References . .5 3 Definitions and abbreviations . . .5 . 5 3.1 . 5 3.2 4 General func
8、tional description of ADSL/ISDN splitters . . . .6 4.1 . 6 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Abbreviations . . . . . . . . . . . . . . . . .
9、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional diagram . . . . . . . . . . . . . . 5 5.1 5.1.2 5.2 5.2.1 5.2.2 5.3 Splitter testing conditions . . . 7 . 7 . 7 . 7 . 7 . 8 . 8 DC testing conditions
10、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC feeding current . Terminating impedances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . zmsL-I 5.1.1 Polarity independence . 7
11、 Z and Z . T L General transmission test setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6.1 6.1.1 6.1.2 6.1.3 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.9.1 6.9.2 Splitter requirements . .9 DC requirements . . . 9 DC resistance to earth .
12、 . 9 Isolation resistance betwee e 9 DC series resistance . . 9 High pass path of the splitter . . 9 Passband insertion loss requirements for the LPF . .10 Passband return loss requirements for the LPF . .10 Unbalance about earth . .ll Isolation requirements (insertion loss in ADSL band) .12 . .13 .
13、 .14 .14 ADSL insertion loss . .14 .15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Annex A (informative): Bibliography . 16 History 17 ETSI 4 ETSI TS 101 952-1-3 VI .I .I (2002-05) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been
15、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 Property Rights (IPRs); Essential, or potentially Essential, IPRs notijied to ETSI in respect of ETSI standards“,
16、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 carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR O00 3
17、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 Technical Committee Transmission and Multiplexing (TM) and in co-operation with ETSI Technical Committee Access and
18、Terminals (AT). The present document is part 1, sub-part 3 of a multi-part deliverable covering Access network xDSL transmission filters, as identified below: Part 1: “ADSL splitters for European deployment“; Sub-part 1: Sub-part 2: “Specification of the low pass part of ADSL/POTS splitters“; “Speci
19、fication of the high pass part of ADSL/POTS splitters“; Sub-part 3: “Specification of ADSL/ISDN splitters“; Sub-part 4: “Specification for ADSLPISDN or POTS“ universal splitters“; Sub-part 5: “Specification for ADSL/POTS distributed splitters“; Part 2: NOTE: “VDSL splitters for European deployment“.
20、 The choice of a multi-part format for the present 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 ro
21、lling Action Plan“ especially under the key objective of a cheaper, faster and secure Internet. ETSI 5 ETSI TS 101 952-1-3 VI .I .I (2002-05) 1 Scope The present document specifies requirements and test methods for DSL splitters. These splitters are intended to be installed at the Local Exchange sid
22、e of the local loop and at the user side near the NTP. The present document specifies requirements and test methods for ADSL/ISDN splitters. 2 Refe re nces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are
23、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 applies. il ETSI TS 102 080: “Transmission and Multiplexing (TM); Integrated Servi
24、ces Digital Network (ISDN) basic rate access; Digital transmission system on metallic local lines“. ITU-T Recommendation 0.9: “Measuring arrangements to assess the degree of unbalance about earth“. 21 3 Definitions and abbreviations 3.1 De fin it ions For the purposes of the present document, the fo
25、llowing 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 in the splitter, the values and configuration of which may be operator dependent, which has the purpose of enabling network ope
26、rators remote line testing equipment to determine the presence of a splitter on a line 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: 2B1Q 4B3T ADSL CPE HPF ITU LPF LT NT NTP ONU PAM ISDN-BA Baseband linecode for ISDN-BA (4-PAM) (or MMS43) Alternative
27、ISDN-BA baseband linecode with higher frequency spectrum than 2B 1Q Asymmetric Digital Subscriber Line Customer Premise Equipment High Pass Filter Integrated Services Digital Network-Basic Access International Telecommunication Union Low Pass Filter Line Termination Network Termination Network Termi
28、nation Point Optical Network Unit Pulse Amplitude Modulation ETSI 6 ETSI TS 101 952-1-3 VI .I .I (2002-05) 4 General functional description of ADSLASDN splitters The main purpose of the ADSLASDN splitter filter is to separate the transmission of ISDN-BA signals, and ADSL band signals, enabling the s
29、imultaneous transmission of both services on the same twisted pair. The splitter also serves to protect ISDN from interference due to egress (and ingress) from ADSL signals. Equally it protects the ADSL transmission from interference due to the underlying ISDN service. Insertion of a splitter filter
30、 in existing ISDN-BA lines shall have only a low impact on the performance of the ISDN-BA service. The splitter filter may be implemented as an independent unit, separately from the ADSL transceiver, or may be integrated with the ADSL termination unit. 4.1 Functional diagram The functional diagram f
31、or the splitter combination is given in figure 1. ISDN ISDN LT-side (Central Ofjce) or (Optical network unit) ADSL transceiver o ADSL transceiver NT-side (Customer Premises) Figure 1: Functional diagram of the ADSL splitter configuration The transfer functions between the different ports of the spli
32、tter can be understood as follows: The transfer function from the ISDN port to the line port and vice-versa is that of a low-pass filter. A high level of isolation is required from the ADSL port to the ISDN port to prevent undesirable interaction between ADSL and existing narrowband services. The tr
33、ansfer function from the ADSL port to the line port and vice-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
34、interoperability between ISDN equipment and splitters is for further study. ETSI 7 ETSI TS 101 952-1-3 VI .I .I (2002-05) I &I LINE 0 PORT 3g ISDN PORT* (Mandatory - li cB Blocking capacitors) ADSL PORT Figure 2: Structure of the ADSLIISDN splitter filter 5 5.1 Splitter testing conditions DC testing
35、 conditions 5.1.1 Polarity independence The splitter shall conform to all the applicable requirements 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 use
36、d as this may be polarity dependant. 5.1.2 DC feeding current The requirements in the present document are valid for a DC current of O mA to 60 mA. NOTE: Dynamic behaviour at switch on of ISDN systems can result in DC currents beyond 60 mA being present in the loop during short periods of time ( 16d
37、B 135 !2 14 dB 135 !2 Frequency band 1 kHz to 60 kHz 60 kHz to 80 kHz For an ADSL/ISDN 4B3T splitter, the low pass filter of the splitter shall meet the requirements stated in table 2. Return loss ZT=ZL 16dB 150 !2 14 dB 150 !2 Passband return loss requirements for the LPF The return loss of the spl
38、itter shall be measured at the ISDN port only. The test setup is given in figure 5. For an ADSL/ISDN 2B1Q splitter, the low pass filter of the splitter shall meet the requirements stated in table 3. The DC feeding current is specified in clause 5.1.2. For an ADSL/ISDN 4B3T splitter, the low pass fil
39、ter of the splitter shall meet the requirements stated in table 4. The test setup is given in figure 5. The calculation of return loss shall be carried out according to the definition in figure 6. ETSI 11 + ISDN Port ETSI TS 101 952-1-3 VI .I .I (2002-05) Line Zl Port UD 2: r 6.5 Unbalance about ear
40、th load The basic test setup for measuring unbalance at the ISDN port is shown in figure 7. In the case of measuring at the LINE port, the test setup of figure 7 is used, however with the ISDN and LINE terminations reversed. The test shall be carried out for the combinations described in table 5. No
41、te that the source and measurement are always at the same port. IZ1 +z21 IZ1 -221 RL = 20*log _- The DC feeding current is specified in clause 5.1.2. In the case of performing measurements at frequencies above 30kHz, for reasons of practical testing a 150 i2 impedance should be used in series with t
42、he longitudinal source (i.e. S1 in figure 7 should be open). #Test setup Source and State of S2 1 2 3 The ADSL port shall be terminated by a 100 i2 resistor for all unbalance tests described in the present document. Z, is as defiied in clause 5.2.2. Measurement ISDN port Open ISDN port Closed LINE p
43、ort Closed For each of the three test setups described above, the splitter shall meet the unbalance about earth requirements as specified in table 6. 30 kHz to 1 104 kHz 1 104 kHz to 5 MHz Table 6: Unbalance about earth, minimum values Frequency range I State ofSI I Value of R I Minimum unbalance va
44、lue 300 Hz to 30 kHz I Closed I z, 12 I 40 dB L Open 50 !2 46 dB Open 50 !2 40 dB The unbalance about earth is calculated by using the following equation: Unbalance = 2010g lol$l (dB) ETSI 12 Frequency band Splitter Minimum isolation ZT = ZL ETSI TS 101 952-1-3 VI .I .I (2002-05) 150 kHz to 1 104 kH
45、z Earth Doint 65 dB 135 0 kl Frequency band Earth point Minimum isolation ZT = ZL 100 n 150 kHz to 1 104 kHz NOTE 1: The dotted circuit is only used if the splitter has an earth terminal. NOTE 2: The DC current feeding circuitry is not shown. Care should be taken that this circuitry is implemented i
46、n such a way as not to have significant influence on the accuracy of the measurement. NOTE 3: For resistances Ran equivalent circuit according to ITU-T Recommendation 0.9 2 can be used. 65 dB 150 !2 Figure 7: Unbalance about earth test Set-up If the splitter has no earth terminal, the test should be
47、 performed while the splitter is placed on an earthed metal plate of a sufficiently large size. 6.6 Isolation requirements (insertion loss in ADSL band) When the splitter is to support ADSL over ISDN 2B1Q the low pass filter of the splitter shall meet the requirements specified in table 7. In the ca
48、se where the source is at the ISDN port of the splitter (i.e. the setup of figure S), then the source impedance shall be Z, and the load impedance should be Z,-,. In the case where the source is at the ADSL port of the splitter (i.e. the setup of figure 9), then the source impedance shall be Z,-, an
49、d the load impedance should be Z,. The test setups are given in figures 8 and 9. When the splitter is to support ADSL over ISDN 4B3T the low pass filter of the splitter shall meet the requirements specified in table 8. The basic test setups are given in figures 8 and 9. An example of a test setup implementation is given in figure 1 O. ETSI 13 IS DN Z
