ETSI TS 101 952-1 V1.1.1 (2009-06)

Access network xDSL splitters for European deployment; Part 1: Generic specification of xDSL over POTS splitters

RTS/ATTM-06021

General Information

• Status: Published
• Publication Date: 10-Jun-2009
• Technical Committee: ATTM TM6 - Wireline Access Network Systems
• Current Stage: 12 - Completion
• Due Date: 15-Apr-2009
• Completion Date: 11-Jun-2009

Standards Content (Sample)

ETSI TS 101 952-1 V1.1.1 (2009-06)
Technical Specification


Access network xDSL splitters
for European deployment;
Part 1: Generic specification of xDSL
over POTS splitters

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2 ETSI TS 101 952-1 V1.1.1 (2009-06)



Reference
RTS/ATTM-06021
Keywords
ADSL, POTS, splitter, VDSL
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3 ETSI TS 101 952-1 V1.1.1 (2009-06)
Contents
Intellectual Property Rights . 6
Foreword . 6
Introduction . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definitions, symbols and abbreviations . 10
3.1 Definitions . 10
3.2 Symbols . 11
3.3 Abbreviations . 12
4 General functional description of xDSL over POTS splitters . 13
4.1 Functional diagram . 13
4.2 High pass block: three alternatives . 14
5 Circuit definitions, testing conditions and methods . 14
5.1 DC testing conditions . 14
5.1.1 Polarity independence . 14
5.1.2 DC feeding conditions (on/off-hook) . 14
5.1.3 DC feeding and loading bridges . 15
5.2 AC terminating impedances Z . 16
AC
5.2.1 Z and Z , xDSL transceiver related impedances . 16
RefDSL DSL
5.2.2 Z and Z , off-hook impedances . 16
R SL
5.2.3 Z , xDSL band impedance . 17
RHF
5.2.4 Z , on-hook high impedance . 17
OnHI
5.2.5 Z , on-hook low impedance . 17
OnLI
5.2.6 Z , impedance on-hook . 17
OnHo
5.2.7 Z , load impedance for ringing . 18
Ring
5.2.8 Z , impedance of the metering device . 18
Meter
5.3 High pass filter implementation . 18
5.3.1 High pass filter alternative B: First order filter . 18
5.3.2 High pass filter alternative C: higher order filter . 19
5.3.3 Reference high pass filter . 19
5.4 General transmission test set-up . 19
5.4.1 General definition of the Insertion Loss (IL) measurement . 20
5.4.2 POTS signal loss: IL LINE port to POTS port . 20
5.4.3 xDSL signal isolation: IL LINE to POTS port or xDSL to POTS port . 21
5.4.4 xDSL signal loss: IL LINE port to xDSL port . 21
5.4.5 General definition of the Return Loss . 23
5.4.6 Return Loss test set-up at LINE port and POTS port . 24
5.5 Unbalance measurement . 24
5.5.1 General definition of Longitudinal Conversion Loss . 24
5.5.2 General definition of Longitudinal Conversion Transfer Loss . 25
5.5.3 LCL and LCTL test set-up . 25
5.6 Noise measurement . 26
5.6.1 Psophometric noise in the POTS Band . 26
5.6.2 Noise in the xDSL Band . 27
5.7 Common Mode Rejection Ratio measurement . 27
6 Splitter requirements . 27
6.1 Options for splitter requirements . 27
6.1.1 Option A splitters . 28
6.1.2 Option B splitters . 28
6.2 DC requirements . 28
ETSI

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4 ETSI TS 101 952-1 V1.1.1 (2009-06)
6.2.1 DC resistance to earth . 28
6.2.2 DC insulation resistance between A-wire and B-wire . 29
6.2.3 DC series resistance R . 29
DC
6.2.4 DC signalling . 29
6.3 Ringing frequency requirements . 29
6.3.1 Ringing voltage drop at 25 Hz and 50 Hz . 30
6.3.2 Z impedance in the presence of ringing at 25 Hz and 50 Hz . 30
InRing
6.3.3 Total harmonic distortion at 25 Hz and 50 Hz . 30
6.4 POTS pass band loss requirements (on-hook) . 30
6.4.1 On-hook requirement for the case of high impedance termination . 31
6.4.2 On-hook requirement for the case of low impedance termination . 31
6.4.2.1 Low impedance on-hook POTS pass band insertion loss. 31
6.4.2.2 Low impedance on-hook POTS pass band insertion loss distortion . 31
6.5 POTS pass band loss requirements (off-hook) . 31
6.5.1 Off-hook POTS pass band insertion loss . 32
6.5.2 Off-hook POTS pass band insertion loss distortion . 32
6.6 POTS pass band return loss requirements (off-hook) . 32
6.6.1 POTS pass band return loss requirements, option A . 32
6.6.2 POTS pass band return loss requirements, option B . 32
6.7 Requirements relating to metering pulses at 12 kHz or 16 kHz (optional). 33
6.8 Unbalance about Earth . 33
6.8.1 Unbalance of the low pass part . 33
6.8.2 Unbalance of the high pass part for alternative B or C . 34
6.9 xDSL band requirements . 34
6.9.1 xDSL band on-hook isolation between LINE and POTS port . 35
6.9.2 xDSL band off-hook isolation between LINE and POTS port . 35
6.9.3 Transition band signal loss: IL between POTS port and LINE port (optional) . 36
6.9.4 xDSL signal loss: IL LINE port to xDSL port . 36
6.9.4.1 High pass alternatives A and B . 36
6.9.4.2 High pass alternative C . 37
6.10 Noise levels . 37
6.10.1 POTS band audible noise level . 37
6.10.2 xDSL band noise level . 37
6.11 Distortion . 37
6.11.1 POTS band intermodulation distortion . 37
6.11.2 Extended xDSL band intermodulation distortion (informative) . 38
6.12 Group delay distortion . 38
6.13 POTS transient effects (informative) . 38
6.14 Requirements for Common Mode Rejection (optional) . 39
6.15 Requirements for Crosstalk at the LE (optional) . 39
Annex A (normative): xDSL specific information . 40
A.1 Z and Z for specific xDSL over POTS variants . 40
DSL RefDSL
A.1.1 Generic definition of Z , using C , Z , C and L . 40
DSL DCB RefDSL DSL DSL
A.1.2 Z for ADSL over POTS . 41
DSL
A.1.3 Z for European VDSL1 over POTS, with US0 starting at 25 kHz . 42
DSL
A.1.4 Z for VDSL2 over POTS with US0 . 42
DSL
A.2 Common requirements for passive POTS splitters . 43
A.3 Specific requirements for passive splitters for ADSL over POTS variants. 45
A.4 Specific requirements for passive splitters for VDSL1 over POTS variants. 46
A.5 Specific requirements for passive splitters for VDSL2 over POTS variants at the TE side . 46
A.6 Specific requirements for passive splitters for VDSL2 over POTS variants at the LE side . 47
Annex B (informative): Evolution of the documents . 48
Annex C (informative): Use of the present document for splitters at the cabinet . 49
Annex D (informative): Intrinsic IL and RL caused by Z in the POTS band. 50
DSL
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5 ETSI TS 101 952-1 V1.1.1 (2009-06)
Annex E (informative): IL Measurement from LINE to xDSL inside Z . 51
DSL
Annex F (informative): Return Loss measurements: practical diagrams. 53
Annex G (informative): Insertion Loss measured with feeding and loading bridges . 54
Annex H (informative): Dynamic tests of splitters in the presence of xDSL transceivers (WT-
127 of the Broadband Forum) . 55
H.1 General description. 55
H.2 Detailed description . 56
H.2.1 Static tests under continuous signals according to WT-127 . 57
H.2.2 Dynamic tests according to WT-127 . 57
Annex I (informative): Optimal transmission of POTS and xDSL signals and their
separation . 58
Annex J (informative): More on feeding and loading bridges . 60
Annex K (informative): Additional requirements for Active Splitter (F.F.S.) . 61
K.1 Bidirectional IL tests . 61
K.2 Noise measurements methods for active splitters . 61
K.2.1 (5.6.1) Psophometric noise in the POTS Band . 61
K.2.2 (5.6.2) Noise in the xDSL Band . 61
K.3 (6.10) Noise requirements for active splitters . 61
K.3.1 (6.10.1) POTS band audible noise level . 62
K.3.2 (6.10.2) xDSL band noise level . 62
K.4 (6.11) Distortion . 62
K.5 (6.13) Transitional tests . 62
Annex L (informative): Bibliography . 63
History . 64

ETSI

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6 ETSI TS 101 952-1 V1.1.1 (2009-06)
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, 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 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 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, Terminals, Transmission
and Multiplexing (ATTM).
The present document is part 1 of a multi-part deliverable covering Access network xDSL splitters for European
deployment, as identified below:
Part 1: "Generic specification of xDSL over POTS splitters";
Part 2: "Generic specification of xDSL over ISDN splitters and xDSL universal splitters";
Part 3: "Generic specification of distributed filters for xDSL over POTS";
Part 4: "Additional specifications for dynamic distributed filters for xDSL over POTS".
NOTE 1: Before the publication of the 3 or 4 parts as described above, the TS 101 952 was composed of 2 parts,
which discriminated between ADSL and VDSL, with several subparts. For reasons of simplicity the TS is
now restructured as a set of only 3 (potentially 4) documents, intended for both ADSL and VDSL when
applicable. The older structure of the documents is explained in the informative annex B.
NOTE 2: Useful information on splitter tests may be found in TR 101 953-1-1 [i.3], TR 101 953-1-2 [i.4],
TR 101 953-2-1 [i.5] and TR 101 953-2-2 [i.6]. These documents are linked to the previous versions of
the splitter specifications. [i.3], [i.4], [i.5] and [i.6] e.g. describe the combination of the AC testing
conditions of the test set-ups with the DC conditions controlled via feeding and loading bridges. If there is
a discrepancy between the present document and the older TR 101 953 series of documents, the present
document prevails.
NOTE 3: The use of distributed filters is not recommended for VDSL but it is not excluded. For this reason parts 3
and 4 refer to distributed filters for xDSL and not just for ADSL.
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

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7 ETSI TS 101 952-1 V1.1.1 (2009-06)
Introduction
Remarks on and limitations of the present document
The present document covers all xDSL system variants, such as ADSL, ADSL2, ADSL2plus, VDSL1 and VDSL2. It is
applicable at the Local Exchange (LE) (i.e. network) side of the line at the LE or at the cabinet and at the Terminal
Equipment (TE) (i.e. user) side of the line. A number of limitations and remarks should be listed:
1) The use of the present documents is extended to splitters at the cabinet. Indeed, the previous versions of the
present document clearly stated that they did not apply to splitters at the cabinet. However as explained in the
informative annex C, this restriction was lifted.
2) The present document does not contain the requirements for splitters, which can handle both POTS and ISDN.
These so-called xDSL over "ISDN or POTS" universal splitters are specified in part 2.
3) Splitters at the customer premises with a distributed topology, called distributed filters, are not within the
scope of the present document. They are described in part 3 (and potentially part 4).
4) The present document covering xDSL over POTS splitters was gained from the experience with passive and
static xDSL splitters, the original state of the art for this application. Furthermore, the experience was gained
with identical requirements at either side of the line. Therefore, the requirements in the present document are
primarily intended for passive and static filters, with identical requirements for the LE side and the TE side of
the line. However, in the note under table A.3 an optional diversification between splitters requirements at the
two sides of the line is described. For the TE side splitters an optional variant could be allowed with better
downstream protection, with less IL in the upstream band and more IL in the downstream band. Similar
differentiation between LE and TE is possible for the balance requirements, see the note under table A.10.
5) The present document covering xDSL over POTS splitters is limited to passive and static splitters. There are
other classes of filters possible, besides passive and static splitters. Such active and/or dynamic filters are
composed of other elements than passive components. Active/dynamic splitters require different and
additional requirements and test methods to be specified. The full specification of requirements for
active/dynamic splitter is F.F.S. An introduction to this is in the informative annex K.
6) For certain static properties in the present document it is possible to relax the requirements and prove in
dynamic tests that the splitter performs sufficiently well. These dynamic tests are compiled in WT-127, by the
Broadband Forum. The use of the WT-127 methodology for this purpose is outside the scope of this version of
the document, but could prove useful to introduce splitters with reduced complexity, or active and/or dynamic
splitters. The WT-127 methodology is not fully finalized. It is described in annex H. Finalizing splitter tests in
the present document based on WT-127 is F.F.S.
7) To test distortion, noise and other requirements in the present document the WT-127 methodology is sometime
a superior methodology, or even the only feasible method at an acceptable complexity. Indeed, WT-127 will
prove that a splitter works correctly in a worst case xDSL test environment. With such tests, based on actual
xDSL transceiver results, one can avoid requirements are either inadequate or potentially unnecessarily strong.
Defining splitter tests based on WT-127 in the present document is F.F.S.
ETSI

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8 ETSI TS 101 952-1 V1.1.1 (2009-06)
1 Scope
The present document specifies requirements and test methods for the low pass and high pass part of xDSL over POTS
splitters. These splitters are intended to be installed at the LE (i.e. network) side of the local loop, either at the local
exchange or at a remote cabinet, and at the TE (i.e. user) side near the NTP. When used at the remote cabinet, the POTS
signals can be injected locally at the cabinet, or at the central office. In the case of splitters at the TE side, the present
document specifies the central splitter that is intended for use at the demarcation point of the customer premises.
The majority of requirements in the present document are generic and applicable to all xDSL over POTS central
splitters. In the case where any requirements are applicable to only one particular flavour of xDSL, this is clearly
indicated in the clause describing the requirement. The relevant information about requirements for specific xDSL
system variants is given in annex A.
The splitter filter, as specified by the present document, may be implemented as an independent unit, separately from
the xDSL transceiver, or may be integrated with the xDSL termination unit. The splitter may also be integrated with the
base band termination unit (e.g. POTS line card); however this is outside of the scope of the present document.
2 References
References are either speci
...