1、ETSI TR 101 953-1-2 1.1.1 (2003-05) Technical Repor Access network xDSL transmission filters; Part 1 : ADSL splitters for European deployment; Sub-part 2: Testing methods for High Pass part of ADSL/POTS splitters 2 ETSI TR 101 953-1-2 VI .I .I (2003-05) Reference DTR/TM-06027-1-2 Keywords ADSL, POTS
2、, splitter, testing, xDSL 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 o
3、f 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
4、). In case of 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 o
5、f 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 restri
6、ction extend to reproduction in all media. O European Telecommunications Standards Institute 2003. 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
7、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 TR 101 953-1-2 VI . 1 . 1 (2003-05) Contents Intellectual Property Rights 4 Foreword . 4 Introduction 4 1 2 3 3.1 3.2 4 5 6 6.1 6.2 6.3 Scope 6 Re
8、ferences 6 Definitions and abbreviations . 6 Definitions . 6 Abbreviations 7 Void 7 Test conditions and general notes 7 Test cases for the high pass part of the ADSL over POTS splitter 9 Insertion loss in the pass band (ADSL) . ADSL to LINE . 10 Insertion loss in the pass band (ADSL) . LINE to ADSL
9、. 12 Unbalance about earth for high pass filter 14 Annex A: Bibliography 17 History 18 ETSI 4 ETSI TR 101 953-1-2 VI .I .I (2003-05) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essent
10、ial 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 from the ETSI Secretariat. Latest updates a
11、re 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 the ETSI Web server) which are, or may b
12、e, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Transmission and Multiplexing (TM). The present document is part 1, sub-part 2 of a multi-part deliverable supporting different aspects of European Specific DSL spli
13、tters, as identified below: Part 1: “ADSL splitters for European Deployment“; Sub-part 1 : Sub-part 2: Sub-part 3 : “Specification of Testing methods for Low Pass part of ADSL/POTS splitters“; “Testing methods for High Pass part of ADSL/POTS splitters“; “Testing methods for ADSL/ISDN splitters“; Par
14、t 2: NOTE: “VDSL splitters for European deployment“. The choice of a multi-part format for this deliverable is to facilitate maintenance and future enhancements. Introd U ction The present document describes test methods for the high pass part of ADSL/POTS splitters. The test methods of the present
15、technical report are based on requirements of different documents describing AD SL/POT S splitters: TS 101 952-1-2 lo: “Access network xDSL transmission filters; Part 1: ADSL splitters for European deployment; Sub-part 2: Specification of the high pass part of ADSL/POTS splitters“; TR 101 728 SI: “A
16、ccess and Terminals (AT); Study for the specification of low pass filter section of ADSL/POTS splitters“; TS 101 388 2: “Transmission and multiplexing (TM); Access transmission systems on metallic access cables; Asymmetric Digital Subscriber Line (ADSL) - European specific requirements ITU-T Recomme
17、ndation G.992.1 modified“; ITU-T Recommendation G.992.1 5: “Asymmetric Digital Subscriber Line (ADSL) transceivers; Annex E (El. Type 1 - European)“. The requirements fromTR 101 728 SI, TS 101 952-1-2 lo and the present document are assessed to be the “essential“ or minimum tests. The additional tes
18、ts that are required in ITU-T Recommendation G.992.1 5 have been assessed as “optional“ tests. There are two columns in each test matrix which inform about the “essential“ and the “optional“ tests. ETSI 5 For each test, the document describes: title of the test; purpose of the test; reference to the
19、 specifications; test configuration; test Set-up; test parameters; test results matrix; measuring notes. ETSI TR 101 953-1-2 VI .I .I (2003-05) ETSI 6 ETSI TR 101 953-1-2 VI .I .I (2003-05) 1 Scope The present document describes test methods for the high pass section of ADSL/POTS splitters. These sp
20、litters are intended to be installed at the Local Exchange side of the local loop and at the user side near the NTP. In the case of splitters at the user side, the present document describes testing methods for the master splitter that is intended for use at the demarcation point of the customer pre
21、mises. Distributed filters are not concerned by the present document. 2 Re fe re n ces For the purposes of this Technical Report (TR) the following references apply: Void. 21 ETSI TS 101 388: “Transmission and multiplexing (TM); Access transmission systems on metallic access cables; Asymmetric Digit
22、al Subscriber Line (ADSL) - European specific requirements ITU-T Recommendation G.992.1 modified“. 31 41 Void. Void. 51 61 ITU-T Recommendation G.992.1: “Asymmetric Digital Subscriber Line (ADSL) transceivers“. ETSI TBR 038: “Public Switched Telephone Network (PSTN); Attachment requirements for a te
23、rminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected to the analogue interface of the PSTN in Europe“. 71 Void. SI ETSI TR 101 728: “Access and Terminals (AT); Study for the specification of low pass filter section of ADSL/POTS s
24、plitters“. 91 Void. lo1 ETSI TS 101 952-1-2: “Access network xDSL transmission filters; Part 1: ADSL splitters for European deployment; Sub-part 2: Specification of the high pass part of ADSL/POTS splitters“. 3 3.1 Definitions and abbreviations De fi nit ions For the purposes of the present document
25、, 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 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: i.e. the state
26、where the TE draws insufficient DC current to activate the POTS exchange. 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 should the CPE be considered to be on hook from the perspective of testing the splitter. off-hook: state
27、 of the POTS equipment at either end of a loop connection when the NTP terminal equipment is in the steady loop state NOTE: i.e. the state where the TE draws sufficient DC current to activate the POTS exchange (excluding the transitions from and to quiescent state). ETSI 7 ETSI TR 101 953-1-2 VI .I
28、.I (2003-05) 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ADSL CPE dBm DC DUT I ISDN ITU LE NF NTP POTS R TE U Z Asymmetric Digital Subscriber Line Customer Premises Equipment Absolute power level expressed in decibels relative to 1 mW Direct Current
29、 Device Under Test Current Integrated Services Digital Network International Telecommunication Union Local Exchange (Central Office) Narrow-band Frequency Network Termination Point Plain Old Telephone Service Resistance Terminal Equipment (e.g. Telephone, Fax, voice band modem etc.) Voltage Impedanc
30、e 4 Void 5 Test conditions and general notes For each test, feeding bridge and holding circuit must comply to the requirements as specified in TBR 038 6 with respect to the low frequency range. Similar performance is required for the high frequency range (up to 1 MHz). An equivalent accuracy may be
31、obtained by calibrating the feeding bridge and holding circuit across the relevant frequency range. a a Test connection Feeding bridge b b Signal insertion I DC insertion I UF RF IF Figure 1: External circuitry for feeding bridge ETSI 8 ETSI TR 101 953-1-2 VI .I .I (2003-05) a o a o Holding circuit
32、Figure 2: External circuitry for holding circuit NOTE 1: Direction of the feeding current may impact the additional insertion loss caused by feeding bridge and holding circuit. A calibratiodnormalization measurement need to be taken before each single measurement step. NOTE 2: When a test is proposi
33、ng “alternating polarity“ the test should be performed in a way that the direction of the feeding current is changed from test to test (e.g. when a test is to be performed with O, 20, 60, 80 mA using alternating polarity the test should be performed with +O mA, -20 mA, +60 mA, -80 mA). NOTE 3: The c
34、onnection of the DC feeding is essential, i.e. for LE splitters the feeding bridge should be connected to the POTS port and the holding circuit should be connected to the LINE port. For TE splitters the feeding bridge should be connected to the LINE port and the holding circuit should be connected t
35、o the POTS port. The feeding arrangements shown in the test Set-ups in the present document are generally for testing TE splitters. NOTE 4: The inaccuracy of the measurement which results from tolerances in the test set-up and its containing equipment should be carefully considered. When giving a ve
36、rdict on the test results with respect to the requirement in the related standard this tolerance in the test results need to be taken into account. Before splitters are tested the class of splitter should be categorized. Basis for this could be the schematic of the splitter or a statement of the man
37、ufacturer. The following classes have been identified so far in the course of this project: passive: splitters which do exclusively contain passive components; passive with current/voltage detection: splitters which perform NF filtering using passive components, which are enhanced by detection circu
38、its based on the DC voltage andor the DC current; active: splitters which contain active components (like OP amplifier) to perform the NF filtering. NOTE 5: The splitters which have been evaluated during the validation of the test methods described herein are to be classified in clusters “passive“ o
39、r “passive with current/voltage detection“. No “active“ splitters could be made available for evaluation. The results of ETSI STF 215 could be validated for the first two classes, for the third class (active splitters) theoretical test case validations have been discussed. At some test cases in the
40、present document, a difference is made between splitters which do not break the DC path and splitters which do break the DC path. The following drawings should give guidance for the separation of these two different types. ETSI 9 ETSI TR 101 953-1-2 VI .I .I (2003-05) - active filte- ring Active fil
41、tering - - coupling : i Power ! sink - T Power Source - - T Figure 3: Example for a splitter not breaking the DC path Filters with current/voltage detection must be classified under the first type of splitter for their operating range (e.g. DC current above detection limit) and under the second type
42、 of splitter in the blocking range (e.g. DC current below detection limit). 6 Test cases for the high pass part of the ADSL over POTS splitter The test cases described include: insertion loss in the pass band (ADSL) - ADSL to line; insertion loss in the pass band (ADSL) - Line to ADSL; unbalance abo
43、ut earth for the high pass filter. ETSI 10 ETSI TR 101 953-1-2 VI .I .I (2003-05) Test case name: Refe re n ce : Test purpose: Test configuration: 6.1 Insertion loss in the pass band (ADSL) - ADSL to LINE insertion loss in the pass band (ADSL) TS 101 952-1-2 IO, clause 7.1 to evaluate the insertion
44、loss in the passband (ADSL) in when tested with the test parameters as given in the related standards see test Set-up; DUT not configured Test set up: LINE POTS I Feeding m -port Holding Bridge - - ADSL PO* Level meter - RDC i RF Signal source us Figure 5: Verification of the test Set-up for ADSL to
45、 LINE insertion loss testing Splitter (DUT) POTS with blocking Holding capacitors w ZPOTS 2X120nF -I RDC Level meter A IF 470 pH Signal source RF - us Figure 6: Test Set-up for ADSL to LINE insertion loss testing ETSI 11 Parameter ETSI TR 101 953-1-2 VI .I .I (2003-05) Value Test parameters: Level o
46、f the test signal Us Frequency Range Combination of source and load impedances Termination at POTS: ZOTS Level of Feeding voltage Level of Feeding current Polarity of feeding voltagehrrent Table 2: Test parameters for the insertion loss in the pass band (ADSL) - ADSL to LINE test case -10 dBm 30 kHz
47、 to 11 04 kHz combination 1 : Z, = 1 O0 Q, Zload = 1 O0 Q ZpOTS = short circuit (R c 0,Ol Q) ZpOTS = open circuit 50 “DC O mA 13 mA 80 mA normal and reversed, alternating between the single measurements ZPOTS = ZRHF Test matrix: Table 3: Test matrix for the insertion loss in the pass band (ADSL) - A
48、DSL to LINE test case Test procedure notes: NOTE 1 : The right hand side port of the holding circuit in figure 5 should be lefi open during verification. NOTE 2: Normally the splitter consists of two parts: low pass filter and high pass filter realized with two blocking capacitors 120 nF each. If th
49、e splitter does not contain the blocking capacitors, the two capacitors 120 nF each have to be connected externally. Test results: Test result has to be recorded in dB, where: IL = -20 loglo (U,/,), where U, is the voltage observed when the splitter is connected as in test set-up and where U, is the voltage observed when the splitter is replaced by a direct wire connection of less than 0,Ol Q. Measuring notes: See general notes. ETSI 12 ETSI TR 101 953-1-2 VI .I .I (2003-05) Test case name: Refe re n ce : Test purpose: 6.2 Insertion loss in th
