1、ETSI TS I O1 952-2-3 VI .I .I (2003-03) Technical Specification Access network xDSL transmission filters; Part 2: VDSL splitters for European deployment; Sub-part 3: Specification of VDSLIISDN splitters for use at the Local Exchange (LE) and the user side near the Network Termination Port (NTP) 2 ET
2、SI TS 1 O1 952-2-3 VI .I .I (2003-03) Reference DTSITM-06028-2-3 Keywords ISDN, splitter, testing, VDSL, 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 enregis
3、tre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies 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 conten
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6、d except as authorized by written permission. The copyright and the foregoing 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.
7、TIPHONTM and the TIPHON logo are Trade Marks currently being registered by 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 3 ETSI TS 1 O1 952-2-3 VI .I .I (2003-03) Contents Intellectual Prope
8、rty 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 5.2.2 5.3 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 Scope 5 References . .5 Definitions and abbreviations. . .6 . 6 . 6 General functional description of VDSL over ISDN splitters 6 Functional diagr
9、am . 7 Splitter testing conditions .8 DC testing conditions 8 Polarity independe 8 DC feeding current Terminating impedances . 8 . 8 zvDsL-I . . 8 ZT and ZL . 8 General transmssion test setup . Splitter requirements . .9 DC requirements 9 9 DC resistance to earth Isolation resistance between A-wire
10、a DC series resistance . 9 10 10 10 High pass path of the splitte Passband insertion loss requ he LPF . 10 Passband return loss requirements for the LPF . 11 11 Unbalance about earth . 12 Isolation requirements (insertion loss in VDSL band) 14 Noise . 15 Delay distortion . 15 VDSL related requiremen
11、ts . 15 VDSL insertion loss . 16 VDSL band distortion . . History 17 ETSI 4 ETSI TS 1 O1 952-2-3 VI .I .I (2003-03) 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,
12、 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 are available on t
13、he ETSI Web server (5). All published ETSI deliverables shall include information which directs the reader to the above source of information. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Transmission and Multiplexing (TM). The present document is part 2,
14、sub-part 3 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-part 2: “Specification of the low pass part of VDSL/POTS splitters“; “Spe
15、cification of the high pass part of VDSL/POTS splitters for use at the Local Exchange (LE) and the user side near the Network Termination Point (NTP)“; 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)“. NO
16、TE: 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
17、 rolling Action Plan“ especially under the key objective of a cheaper, faster and secure Internet. ETSI 5 ETSI TS 1 O1 952-2-3 VI .I .I (2003-03) 1 Scope The present document describes requirements and test methods for DSL splitters. The present document specifies requirements and test methods for V
18、DSL over ISDN splitters to be used at the Local Exchange and at the user side near the NTP. This present document is derived from TS 101 952-1-3 4, describing requirements for ADSL over ISDN splitters. A consequence of this is that the filter described in the present document can only be applied to
19、VDSL over ISDN in an environment where the VDSL pass band starts around 138 kHz. The low pass and high pass filters described in the present document are intended to be used in conjunction each other, and with a practical VDSL transceiver impedance defined in TS 101 270-1 3. If VDSL splitter parts a
20、nd VDSL transceivers are combined which are not intended to inter-operate, then severe problems of incompatibility might arise. There is at least one more variant under study for the high pass filter, and for the related low pass in conjunction with the relevant VDSL impedance: Where the VDSL passba
21、nd starts at a frequency higher than around 900 kHz and the VDSL transceiver impedance is close to the nominal design impedance above this frequency, for instance in a cabinet deployment where the band below around 900 kHz is not used in order to be spectrally compatible with ADSL from the Central O
22、ffice. 2 Re fe re nces 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. For a specific reference,
23、 subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at htlr,. il ETSI TS 102 080: “Transmission and Multiplexing (TM); Integrated Services Digital Netwo
24、rk (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 31 ETSI TS 101 270-1: “Transmission and Multiplexing (TM); Access transmission systems on metallic access cables; Ve
25、ry high speed Digital Subscriber Line (VDSL); Part 1 : Functional requirements“. ETSI 101 952-1-3: “Access network xDSL transmission filters; Part 1 : ADSL splitters for European deployment; Sub-part 3 : Specification of ADSLASDN splitters“. 41 ETSI 6 ETSI TS 1 O1 952-2-3 VI .I .I (2003-03) 3 3.1 De
26、finitions 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 in the splitter, the values and conf
27、iguration 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 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: 2B1Q 4B3T CPE HPF ITU LPF L
28、T NT NTP ONU PAM VDSL ISDN-BA Baseband linecode for ISDN-BA (4-PAM) (or MMS43) Alternative ISDN-BA baseband linecode with higher frequency spectrum than 2B 1Q Customer Premise Equipment High Pass Filter Integrated Services Digital Network-Basic Access International Telecommunication Union Low Pass F
29、ilter Line Termination Network Termination Network Termination Point Optical Network Unit Pulse Amplitude Modulation Very high speed Digital Subcriber Line 4 General functional description of VDSL over ISDN s p I i tte rs The main purpose of the ADSL over ISDN splitter filter is to separate the tran
30、smission of ISDN-BA signals, and VDSL band signals, enabling the simultaneous transmission of both services on the same twisted pair. The splitter also serves to protect ISDN from interference due to egress (and ingress) from VDSL signals. Equally it protects the VDSL transmission from interference
31、due to the underlying ISDN service. Insertion of a splitter filter 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 VDSL transceiver, or may be integrated with the VDSL
32、 termination unit. ETSI 7 ETSI TS 1 O1 952-2-3 VI .I .I (2003-03) 4.1 Functional diagram The functional diagram for the splitter combination is given in figure 1. 88 8 VDSL transceiver L T-side (Central Ofpee) NT-side (Customer Premises) a VDSL transceiver Figure 1: Functional diagram of the VDSL sp
33、litter configuration The transfer functions between the different ports of the splitter 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 VDSL port to the ISDN port to pr
34、event undesirable interaction between VDSL and existing narrowband services. The transfer function from the VDSL 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
35、 to be adequate under a wide range of operational conditions. The issue of general interoperability between ISDN equipment and splitters is for further study. CB -1 (Mandatory Blocking 1- cg capacitors) VDSL Pod Figure 2: Structure of the VDSL over ISDN splitter filter ETSI 8 ETSI TS 1 O1 952-2-3 VI
36、 .I .I (2003-03) 5 5.1 Splitter 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 polarities of the DC line feeding voltage (and the DC line current) provided by the local exchange. This
37、 may not apply in the case where a “signature network“ is used 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. 5.2 Terminating impedances The terminating impedances, given in clauses 5.2.1 and 5.2.2, ar
38、e to be used. NOTE: The impedance definitions used in this clause, in particular the choice of 100 i2 as a reference impedance, are for further study. In many of the tests with ISDN-BA frequencies, the VDSL port of the splitter is terminated with an impedance called Z,. This impedance model as shown
39、 in figure 3, represents the input impedance of the VDSL transceiver as seen from the VDSL 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
40、specification, it is not a requirement on the input impedance of the transceiver. C = 22,l nF 4IU C = 22,l nF NOTE: ZVDSL-, does not include the blocking capacitors CB (see clause 6.2) Figure 3: Schematic diagram of the impedance ZVDsL-, for verifying requirements of the low pass filter 5.2.2 ZT and
41、 Z, For requirements relating to ISDN band frequencies described in the present document, the terminating impedance Z, is used to terminate the ISDN port, while Z, is used to terminate the Line port. Z, is defined as being equal to Z, and both shall follow the definitions of TS 102 O80 i, annex A fo
42、r 2B1Q (135 Q), annex B for 4B3T (150 Q) ISDN-BA. ETSI 9 z LINE (source) Pod ETSI TS 1 O1 952-2-3 VI .I .I (2003-03) ISDN z Meter Pod (load) 5.3 General transmission test setup z ISDh (source) Pod For many of the transmission related tests that are specified in the present document, a common general
43、 test setup is valid. This test setup is given in figures 4 and 5, for measurements at the Line port and ISDN port respectively. It is necessary that a splitter also fulfils all requirements (with the exception of those specified in clauses 6.5, 6.6, 6.7 and 6.9) if there is no VDSL load (the VDSL t
44、ransceiver) connected to the splitter. LINE z Meter Pod (load) Signal source Signal source :o ZP ZVDSL-I I Figure 4: Test Set-up for transmission testing from LINE to ISDN Splitter rl ZVDSL-I Figure 5: Test Set-up for transmission testing from ISDN to LINE 6 Splitter requirements 6.1 DC requirements
45、 6.1 .I DC resistance to earth The DC resistance between each terminal (i.e. A-wire and B-wire) of the splitter and earth, when tested with 120 V DC, shall not be less than 20 MQ. This requirement only applies to splitters with a terminal directly connected to earth. ETSI 10 ETSI TS 1 O1 952-2-3 VI
46、.I .I (2003-03) Frequency band 1 kHz to 40 kHz 40 kHz to 80 kHz 6.1.2 Isolation resistance between A-wire and B-wire Insertion loss ZT = ZL c 0,8 dB 135 !2 c2dB 135 0 The DC resistance between the A-wire and B-wire terminal of the splitter, when tested with 120 V DC, shall not be less than 5 MQ. Fre
47、quency band 1 kHz to 60 kHz 60 kHz to 80 kHz In the case where the splitter is fitted with a signature network, measurement of the DC isolation resistance becomes more difficult. Possible solutions include a switching system in order to open circuit the signature network for the measurement, or inde
48、ed performing the measurement before the signature network is added to the splitter card. It is left to the individual operator to determine how this measurement should be carried out. Depending on the particular test methodology used, the requirement shall be set accordingly. Insertion loss ZT = ZL
49、 c 1,2 dB 150 !2 c2dB 150 0 6.1.3 DC series resistance The DC resistance from the A-wire to the B-wire at the Line interface with the ISDN terminal shorted, or at the ISDN interface with the Line terminal shorted shall be less than or equal to 12,5 Cl. This requirement shall be met for the feeding conditions described in clause 5.1.2. 6.2 High pass path of the splitter The high pass part of the splitter, i.e. the filter between the LINE and VDSL ports, shall be a first order high pass filter made up of two blocking capacitors (one on each wire). The value of each of t
