1、 ETSI TR 101 953-2-3 V1.1.1 (2004-07)Technical Report Access network xDSL transmission filters;Part 2: VDSL splitters for European deployment;Sub-part 3: Specification of Testing methodsfor VDSL/ISDN splittersETSI ETSI TR 101 953-2-3 V1.1.1 (2004-07) 2 Reference DTR/TM-06027-2-3 Keywords ADSL, ISDN,
2、 POTS, VDSL, splitter, testing, xDSL 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
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5、status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: editoretsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foreg
6、oing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2004. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by
7、 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 TR 101 953-2-3 V1.1.1 (2004-07) 3 Contents Intellectual Property Rights4 Foreword.4 1 Scope 5 2 References 5 3 Definitions and abbreviatio
8、ns.5 3.1 Definitions5 3.2 Abbreviations .5 4 Introduction 6 5 Test conditions and general notes 6 6 Test cases for VDSL over ISDN-BA splitters8 6.1 Insertion loss in the pass band (ISDN-BA) 9 6.2 Return loss in the pass band (ISDN-BA)11 6.3 Delay distortion in the pass band (ISDN-BA)13 6.4 Isolation
9、 (insertion loss) at 150 kHz to 12 MHz.15 6.5 Unbalance about earth18 6.6 Unbalance about earth without DC feeding18 6.7 Unbalance about earth with DC feeding.20 6.8 Noise 20 6.9 DC requirements 22 6.9.1 DC resistance to earth.22 6.9.2 Isolation resistance between A-wire and B-wire 24 6.9.3 DC serie
10、s resistance26 6.10 Insertion loss requirements for the high pass part 27 History 30 ETSI ETSI TR 101 953-2-3 V1.1.1 (2004-07) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential
11、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 the ETSI Secretariat. Latest updates are
12、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 SR 000 314 (or the updates on the ETSI We
13、b server) which are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Transmission and Multiplexing (TM) as collaboration between: AT Analogue of Technical Committee Access and Terminals (AT); and TM6 of Te
14、chnical Committee Transmission and Multiplexing (TM). The present document is part 2, sub-part 3 of a multi-part deliverable supporting different aspects of European Specific DSL splitters, as identified below: Part 1: “ADSL splitters for European deployment“; Part 2: “VDSL splitters for European de
15、ployment“: Sub-part 1: “Specification of Testing methods for the low pass part of VDSL/POTS splitters“; Sub-part 2: “Specification of Testing methods for high pass part of VDSL/POTS splitter“; Sub-part 3: “Specification of Testing methods for VDSL/ISDN splitters“. NOTE: The choice of a multi-part fo
16、rmat for this deliverable is to facilitate maintenance and future enhancements. ETSI ETSI TR 101 953-2-3 V1.1.1 (2004-07) 5 1 Scope The present document describes test methods for VDSL/ISDN splitters. These splitters are intended to be installed at the Local Exchange side of the local loop and at th
17、e 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 premises. NOTE 1: At some locations in the present document impedances values are listed. Thes
18、e values might differ from the values listed in the requirement specifications TS 101 952-2-3 1. If the values differ the values of TS 101 952-2-3 1 have to be used. NOTE 2: At some locations in the present document measurements are only shown for splitters at the user side. E.g. this is the case in
19、 figure 5. When measuring a splitter at the Local Exchange side the position of the Feeding bridge and the Holding Circuit have to be exchanged. 2 References For the purposes of this Technical Report (TR) the following references apply: 1 ETSI TS 101 952-2-3: “Access network xDSL transmission filter
20、s; Part 2: VDSL splitters for European deployment; Sub-part 3: Specification of VDSL/ISDN splitters for use at the Local Exchange (LE) and the user side near the Network Termination Point (NTP)“. 2 ETSI TS 101 270-1: “Transmission and Multiplexing (TM); Access transmission systems on metallic access
21、 cables; Very high speed Digital Subscriber Line (VDSL); Part 1: Functional requirements“. 3 ETSI TS 102 080: “Transmission and Multiplexing (TM); Integrated Services Digital Network (ISDN) basic rate access; Digital transmission system on metallic local lines“. 4 ETSI TBR 038: “Public Switched Tele
22、phone Network (PSTN); Attachment requirements 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“. 5 ITU-T Recommendation O.9: “Measuring arrangements to assess the degree
23、 of unbalance about earth“. 6 ETSI TR 102 139: “Compatibility of POTS terminal equipment with xDSL systems“. 3 Definitions and abbreviations 3.1 Definitions 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 connecti
24、on provided from the exchange to the NTP 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ADSL Asymmetric Digital Subscriber LINE CPE Customer Premises Equipment dBm Absolute power level expressed in decibels relative to 1 mW dBV Absolute voltage level e
25、xpressed in decibels relative to 1 Volt DUT Device Under Test ETSI ETSI TR 101 953-2-3 V1.1.1 (2004-07) 6 emf electromotive force I Current ISDN-BA Integrated Services Digital Network-Basic Access ITU International Telecommunication Union LCL Longitudinal Conversion Loss LCTL Longitudinal Conversion
26、 Transfer Loss LE Local Exchange (Central Office) NF Narrow-band Frequency NTP Network Termination Point POTS Plain Old Telephone Service R Resistance TE Terminal Equipment (e.g. Telephone, Fax, voice band modem, etc.) U Voltage VDSL Very high speed Digital Subscriber Line Z Impedance 4 Introduction
27、 The present document describes test methods for the low pass part and the high pass part of VDSL/ISDN-BA splitters. The test methods of the present document are based on requirements of the following document: TS 101 952-2-3 1: “Specification of VDSL/ISDN Splitters“. For each test, the present docu
28、ment describes: title of the test; purpose of the test; reference to the specifications; test configuration; test setup; test parameters; test results matrix; measuring notes. 5 Test conditions and general notes For each test, feeding bridge and holding circuit must comply with the requirements as s
29、pecified in TBR 038 4 with respect to the low frequency range. Similar performance is required for the high frequency range (up to 12 MHz). An equivalent accuracy may be obtained by calibrating the feeding bridge and holding circuit across the relevant frequency range. ETSI ETSI TR 101 953-2-3 V1.1.
30、1 (2004-07) 7 DC insertionTestconnectionSignalinsertionUF RFFeeding bridgeIFaabbAFigure 1: External circuitry for feeding bridge RDCabHoldingcircuitDCabFigure 2: External circuitry for holding circuit General notes: Direction of the feeding current may impact the additional insertion loss caused by
31、the feeding bridge and holding circuit. A calibration/normalization measurement needs to be taken before each single measurement step. When a test is proposing “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. wh
32、en a test is to be performed with 0 mA, 20 mA, 60 mA, 80 mA using alternating polarity the test should be performed with +0 mA, -20 mA, +60 mA, -80 mA). The connection of the DC feeding is essential, i.e. for LE splitters the feeding bridge should be connected to the ISDN port and the holding circui
33、t 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 to the ISDN port. The feeding arrangements shown in the test setups in the present document are generally for testing TE splitters. The inaccur
34、acy of the measurement resulting from tolerances in the test setup and its containing equipment should be carefully considered. When giving a verdict 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 s
35、plitters are tested the class of splitter should be categorized. A basis for this could be the schematic of the splitter or a statement of the manufacturer. The following classes have been identified so far in the course of this project: passive: splitters which do exclusively contain passive compon
36、ents; passive with current/voltage detection: splitters which perform NF filtering using passive components, which are enhanced by detection circuits based on the DC voltage and/or the DC current; active: splitters which contain active components (like OP amplifier) to perform the NF filtering. ETSI
37、 ETSI TR 101 953-2-3 V1.1.1 (2004-07) 8 At some test cases, a difference can be 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: PowersinkActivefilteringNFdecou
38、plingNFcouplingFigure 3: Example for a splitter not breaking the DC path Power sink active filte-ring Power Source Figure 4: Example for a splitter 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 curre
39、nt above detection limit) and under the second type of splitter in the blocking range (e.g. DC current below detection limit). 6 Test cases for VDSL over ISDN-BA splitters The test cases described include: insertion loss in the pass band (ISDN-BA); return loss in the pass band (ISDN-BA); delay disto
40、rtion in the pass band (ISDN-BA); isolation (Insertion loss) at 150 kHz to 12 MHz; unbalance about earth; noise; DC resistance to earth; isolation resistance between A-wire and B-wire; ETSI ETSI TR 101 953-2-3 V1.1.1 (2004-07) 9 DC series resistance; insertion loss requirements for the high pass par
41、t. 6.1 Insertion loss in the pass band (ISDN-BA) Table 1: Description of the insertion loss in the pass band (ISDN-BA) test case Test case name: Insertion loss in the pass band (ISDN) Reference: TS 101 952-2-3 1, clause 6.3 Test purpose: To evaluate the insertion loss in the pass band (ISDN-BA) when
42、 tested with the test parameters as given in the related standards Test configuration: See test setup; DUT not configured Test setup: UFRFFeeding Bridge A R DC Signal V IFU1 a b Zs Us a b DC Z Load Holding Circuit a LINE a b UFRFFeeding Bridge A R DC Signal V IFU2 a b Zs Us Holding Circuit a b DC Z
43、Load ISDN b Z T-VDSL a b VDSL DUT Figure 5: Test setup for insertion loss testing on a splitter The Feeding Bridge and Holding Circuit must comply with the requirements as specified in TBR 038 4. As the TBR 038 4 defines the feeding bridge and the holding circuit only for the voice frequency band, s
44、pecial care need to be taken on the electrical characteristics of the feeding bridge and the holding circuit in the ISDN-BA specific frequency band. ETSI ETSI TR 101 953-2-3 V1.1.1 (2004-07) 10Test parameters: Table 2: Test parameters for the insertion loss in the pass band (ISDN-BA) test case Param
45、eter Value Level of the test signal Us -10 dBm Frequency of the test signal Us 1 kHz to 80 kHz Combination of source and load Impedances combination 1: Zsource= 135 ; Zload= 135 ; RDC = 470 (2B1Q) combination 2: Zsource= 150 ; Zload= 150 ; RDC = 470 (4B3T) Termination at VDSL: ZT-VDSLZT-VDSL= ZVDSL-
46、I ZT-VDSL= open circuit Level of feeding voltage UF= 50 VDC, UFmay be increased to reach the specified feeding current values Value of feeding current IF0 mA to 60 mA Polarity of feeding voltage normal and reversed, alternating between the single measurements Measured transmission passive splitters:
47、 LINE - ISDN active splitters: LINE - ISDN and ISDN - LINE Optional tests none Test matrix: Table 3: Test matrix for the insertion loss in the pass band (ISDN-BA) test case TS 101 952-2-3 1 Essential tests Level of the test signal - 10 dBm X X Frequency of the test signal 1 kHz to 80 kHz Source/load
48、 combination 1 X (see note) X (see note) Source/load combination 2 X (see note) X (see note) DC feeding voltage/current +50 VDC/0 mA X X -50 VDC/60 mA ZT-VDSL= ZVDSL-IX X ZT-VDSL= open circuit Transmission Direction ISDN - LINE active and passive active and passive Transmission Direction LINE - ISDN
49、 active only active only Number of tests passive: 8 tests, active: 16 tests passive: 8 tests, active: 16 tests NOTE: If a splitter is specially designed to work only for one of the options (with ISDN 4B3T or ISDN 2B1Q) it is sufficient to test it with one of the source/load combinations. Test procedure notes: NOTE 1: Direction of the feeding current is not expected to impact the insertion loss of splitters. NOTE 2: Direction of the feeding current may impact the additional insertion loss caused
