VDSL2 and in-door PLT coexistence - · PDF fileVDSL2 and in-door PLT coexistence Plugtests™ Event May 25-29, 2009 Test Plan ... VDSL2 services are provided by a DSLAM located close

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VDSL2 and in-door PLT coexistence

Plugtests™ Event

May 25-29, 2009

Test Plan Ed.08

165 rue Yves Chauvin Node Park Touraine

37310 Tauxigny, France Tel : 33 (0)2 47 43 25 00 Fax : 33 (0)2 47 43 25 01

www : http://www.lanpark.eu


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Table of content 1 Introduction ....................................................................................................................................... 3 2 Context ............................................................................................................................................. 4 3 Objectives ......................................................................................................................................... 5 4 General Information .......................................................................................................................... 5

4.1 Location & dates ....................................................................................................................... 5 4.2 Contacts .................................................................................................................................... 5

4.2.1 ETSI ........................................................................................................... 5

4.2.2 LAN ........................................................................................................... 5 5 Test plan ........................................................................................................................................... 6 6 Detailed test plan .............................................................................................................................. 9

6.1 Variables ................................................................................................................................... 9 6.1.1 PLT technology .................................................................................................................. 9 6.1.2 Access copper line cable type & length ............................................................................. 9 6.1.3 In-house copper line cable ................................................................................................. 9 6.1.4 In-house power line cable .................................................................................................. 9 6.1.5 Location of PLT Devices .................................................................................................... 9 6.1.6 Length of co-localized DSL & PLT cables ......................................................................... 9 6.1.7 Space between DSL & PLT cables ................................................................................... 9 6.1.8 DSL filter types................................................................................................................... 9 6.1.9 PLT filter(s) ........................................................................................................................ 9 6.1.10 VDSL2 configurations ........................................................................................................ 9 6.1.11 PLT PSD .......................................................................................................................... 10

6.2 Proposed tests ........................................................................................................................ 11 6.2.1 PHY-Measurements ........................................................................................................ 11 6.2.2 Performance tests ............................................................................................................ 12

7 Organisation ................................................................................................................................... 16 7.1.1 PLT devices ..................................................................................................................... 16 7.1.2 Participants ...................................................................................................................... 16 7.1.3 Confidentiality .................................................................................................................. 16 7.1.4 Calendar .......................................................................................................................... 17

8 Conclusion ...................................................................................................................................... 18


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1 Introduction ETSI PC PLT has launched a project of a Plugtests™ devoted to coexistence between VDSL2 and in-door PLT technologies. This document is the Test Plan agreed by ETSI TC PLT and prepared jointly with the Laboratoire des Applications Numériques (LAN) for the Plugtests™ on coexistence between VDSL2 and PLT. We first outline the context and the goals targeted within this project, propose the test plan and provide some details on the organisation and on the calendar.


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2 Context Whereas most players acknowledge that both technologies are complementary since they allow consumers to get access to 3-play services through a VDSL2 access and without rewiring between the home DSL gateway, or “box”, or Integrated Access Device (IAD), and the Set top Box (STB), there is still some debate on possible interferences between both Technologies, since they populate the same bandwidth and use signals propagating on copper wires that may be in vicinity.

On the access side, VDSL2 services are provided by a DSLAM located close to the building when considering FTTC deployments or “at” the building for FTTB configurations. However, in both cases, PLT is now recognised as a straightforward solution to bridge the VDSL2 IAD located in the premises (near the line access point, so seldom in the sitting room…) with the STB. More generally, PLT is transforming the mains of apartments and houses into a backbone IP network. Also, to some extent, the exact situation with respect to the presence in the field of master or distributed POTS splitters is not mandated. On the PLT side, there are numerous technologies competing in the field as no international standard is yet available.


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3 Objectives The main objective is to investigate coexistence of both technologies. More precisely, ETSI PLT group is willing to provide formal contribution to the following questions:

- Which degradations, on both technologies may arise? - What mechanisms can be implemented to improve coexistence?

4 General Information

4.1 Location & dates This event is planned at LAN’s offices, close to Tours, France, from May 25 to 29, 2009.

Laboratoire des Applications Numériques, LAN

165 rue Yves Chauvin Node Park Touraine

37310 Tauxigny, France. Tel : 33 (0)2 47 43 25 00 Fax : 33 (0)2 47 43 25 01

4.2 Contacts

4.2.1 ETSI Coordinator for the Plugtests™

Maya AYACHE: [email protected].

PLT Group delegate

Roger SAMY: [email protected]

4.2.2 LAN Coordinator for the Plugtests™

Maryse JAMOIS: [email protected]

Technical & Organisation

Thierry DOLIGEZ: [email protected]


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5 Test plan VDSL2 and PLT technologies, that are both using the same frequency band [0, 30MHz], may interfere through two ways:

Coupling caused by indoor wiring: signals may be radiated because both copper pair (supporting the VDSL2 traffic) and power line (supporting the PLT traffic) are located nearby;

Coupling caused by DC power-supply of the DSL modem: VDSL2 CPE’s power supply is plugged in the mains generally on the same branch of the power cable that one of the PLT device.

These two types of coupling may be the source of interference for both technologies. Also, the test plan has to take into account the following points:

VDSL2 configuration: o The configuration of the VDSL2 link will have to be specified in detail according to

Telcos practise in order to cover representative deployment for triple-play services. o Especially, a set of band profiles and VDSL2 settings will have to be defined for the

Plugtests™. The idea is here to limit the number of combinations to be used for the tests (in order to keep the overall number of tests at a manageable amount for this test campaign), but to use representative configurations for TVoDSL deployment.

o Our proposal is to limit the band profiles to European ones (VDSL2 Annex B), VDSL2 over POTS (US0 type A or none) using asymmetrical 997 and 998 Band Plans for a set of PSD masks covering the various possible bandwidths (i.e. profiles: 8c, 17a, 30a).

o The line settings will be also limited to 1 set of parameters covering typical TVoDSL deployment (i.e. Rate Adaptive & Interleaved mode, INP = 2 or 4, etc.).

Hypothesis: 3 band profiles x 1 line settings = 3 VDSL2 configurations to be tested. PLT technologies & configuration:

o 3 PLT technologies will be used. o Two configuration cases are considered:

steady HD TV flow between two PLT devices (one of them being plugged to the IAD, the other one to the STB),

transient situations (Plug/Unplug of one of the devices), we do not take into account two independent services (eg. : TVoDSL running and an independent local streaming from a Video server to the STB through PLT).

Hypothesis: 3 technologies x (1 steady flow + 1 transient) = 6 PLT configs to be tested. Topology:

o Distance between the DSLAM and CPE has to be scalable to model correctly FTTC and FTTB configurations, four distances will be chosen by default: (very short, short, medium and long distance) from 100 meters to 1.5km ;

o Standard noise representative of self crosstalk for one disturber and background noise.

o Different kind of copper pairs are used for in-door phone networking should be considered: twisted (Cat 3 & Cat 5) or not (untwisted pairs only for PSD measurements), and of variable diameter or type;

o One of the PLT devices is plugged on the same power strip as the IAD or not. o In-door electricity wiring will be 2.5mm diameter and unbalanced with an ISN (30 dB

balance). o A common area where both phone line and the mains are located in vicinity will be

variable from 1m to 40 meters by fixed steps (1, 5, 20, 40 m); space between cables should be adjustable to 4 different values (eg. Contact, 1 cm, 6 cm, 20 cm);

Hypothesis: 4 copper line distances between DSLAM & CPE x 3 in-house types of copper cables x 2 locations of the PLT devices x 4 lengths x 4 spaces between DSL a PLT cables = 384 topologies to be tested.

Analogue Filters: o Another important degree of freedom is the presence and the type of POTS filters

(master splitter or distributed filter) o Also, we propose to add filtered power strips as a preventive measure. Hypothesis: 2 DSL filter types + 2 power strips configurations = 4 analogue filter configurations to be tested.

Measurements:


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o PLT PHY-layer: PSD measurements on the copper pair for different levels of traffic between PLT plugs (using Test Bed #1, see below);

o VDSL2 PHY-layer: PSD measurements on the electricity wire for different VDSL2 configurations (using Test Bed #2, see below);

o VDSL2 Performance: for different topology and analogue filtering configurations, bit error rate measurements considering the nominal reference (ie. Established for a given DSLAM and topology & analogue filtering configuration) VDSL2 link, loss of synchronisation, decrease in bit rate when re-synchronisation occurs (using Test Bed #2) as well as variations in SNR(f) and tone map should be monitored;

o PLT Performance: for different topology and analogue filtering configurations, bit error rate measurements considering the nominal reference for the PLT link, loss of synchronisation and decrease in bit rate (using Test Bed #2) as well as variations in SNR(f) and tone map should be monitored;

o QoE: same test plan as above but only subjective data on the Quality of the service deployed through PLT: eg. SD Video quality.

Metrology: o A set of test tools will be used for these tests (detailed list to be defined) that includes:

Spectrum analysers, baluns, PCs with IX-Chariot, Smartbits SMB200/600 and video quality test tool (Mean Opinion Score values).

Choices for configuration parameters will insure comparable results during the Plugtests™, however other tunings will be available to participants during the event in order to investigate some situations or validate solutions in favour of coexistence. LAN will put in place two test beds that can be used in parallel: Test-bed #1 will be used for PHY-measurements

PLC plug

Test set-up for the evaluation of the impact of PLT on VDSL2Test bed #1: PHY-Measurements

Ed.05 – 20 janvier 2008

PLC plug

ETH ETH

Risk of radiated interferences

© 2008 – Copyright LAN, Laboratoire des Applications Numériques

100 100 50

Spectrum analyser

Traffic Generator/Analyser

Legend

Copper pair

Power line

Ethernet cable

Traffic Generator/Analyser

Copper pair

Power line (230V)

Mains


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Test-bed #2 is taking into account VDSL2 and PLT services. Two analogue DSL filtering configurations (distributed filters and master splitter) are illustrated below.

PLC plug #1

Test set-up for the evaluation of the impact of PLT on VDSL2Test bed #2: Configuration with Distributed Filters

Ed.03 – 16 January 2008

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6 Detailed test plan As explained in the previous section, a large set of parameters has to be taken into account during this test campaign, which could lead to an unrealistic amount of test cases. The guideline is to have flexibility in PLT configurations within realistic VDSL2 environment. This section will define, for each test bed, the set of variables that will be taken into account. More precisely, it is first detailing the set of values that will be studied during the plug test. Then the tests that are proposed to be run are listed, including the coverage of studied parameters.

6.1 Variables

6.1.1 PLT technology The goal is to cover all the existing PLT high frequency technologies.

6.1.2 Access copper line cable type & length PE-0.4mm with variable lengths, from 100 meters to 1.5km covering very short, short, medium and long distances. Proposed values:

- Profiles 8c : 100m, 300m, 900m, 1500m (if it is possible with the noise configuration). - Profile 17a: 50m, 300m, 600m, 1000m (if it is possible with the noise configuration). - Profile 30a : 50m, 150m, 450m (if it is possible with the noise configuration).

Noise : crosstalk based on self crosstalk from 1 disturber applied on both sides of the loop. Background noise must also be injected at both ends of the loop.

6.1.3 In-house copper line cable Twisted (Cat 3 & Cat 5) and untwisted pairs (only for PSD measurements).

6.1.4 In-house power line cable 2.5mm.1

6.1.5 Location of PLT Devices PLT #1: Same Power strip as the IAD or not. PLT #2: near to the STB.

6.1.6 Length of co-localized DSL & PLT cables 1, 5, 20 and 40 m

6.1.7 Space between DSL & PLT cables Contact, 1 cm, 6 cm Pending feedback on investigation of national rulings.

6.1.8 DSL filter types Master Splitter & in-line filter designed for VDSL22.

6.1.9 PLT filter(s) These are filters that are designed to limit the impact of terminal equipments on the PLT link (i.e. low-pass filters). The influence on preventing the risk of conducted interference with this type of filter can be tested.

6.1.10 VDSL2 configurations Profiles 8c, 17a and 30a will be considered.

1 Note that balanced or unbalanced cases of the power lines should both be modeled. Either there is a grounded star point, or the distributed power is balanced without grounding. 2 Note that the presence of a common mode choke in the central splitter could help in preventing crosstalk. This should be tested.


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VDSL2 Band-profile BA8c BA17a BA30a Profile 8c 17a 30a Annex B B B Limit PSD Mask (short name)

997-M1c-A-7 998E17 M2x NUS0 (B8 8)

998E30-M2x-NUS0

(B8-13) US0 type A NA NA MAXNOMATPds + 11.5 dBm 14.5 dBm + 14.5 dBm

Line settings Setting All parameters but those specified below Default value Power management state forced (PMSF) 0 Power management state enabling (PMMode) 0 Loop diagnostic mode forced (LDMF) 0 Automode cold start forced 0 DPBO Off UPBO A value : 60

B Value : 17 RFI notches Off MAXSNRMds FFFF16 MAXSNRMus FFFF16 TARSNRMds 6 dB TARSNRMus 6 dB MINSNRMds 0 dB MINSNRMus 0 dB MSGMINds 16 kbps MSGMINus 16 kpbs Preemption option flag, ds 0016 Preemption option flag, us 0016 Short packet option flag, ds 0016 Short packet option flag, us 0016 FORCEINP 1 delay_maxn ds 8 ms delay_maxn us 8 ms INP_minn ds 17a : 2 symbols

8c : 2 symbols 30a : 4 symbols

INP_minn us 8c : 2 symbols 17a : 2 symbols 30a : 4 symbols

RA-Mode AT_INIT DS net datarate (kbit/s) (max- min) 150000-128 US net datarate (kbit/s) (max-min) 150000-64 Cabinet Assigned Loss 0 dB (default) and 24 dB

6.1.11 PLT PSD The actual PSD of the PLT modems used will be measured and recorded with a spectral analyser before each test. The settings of the spectral analyser will be set to scan from 1 MHz to 30 MHz using a peak detector and a resolution bandwidth of 10 kHz.


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6.2 Proposed tests The tests proposed hereafter are planned to be run for each PLT device.

6.2.1 PHY-Measurements Objective The objective is to measure the noise level coupled from the PLT devices on the DSL line for various types of cable, and various lengths and spaces between the PLT and DSL cables. The background noise is measured at the end of the copper pair simulating the in-door wiring. The DSL transceivers and the characteristic impedance of the DSL line are modelled by resistive 100 ohms loads. Description Test bed #1 is used for the PHY-measurements. Parameters Parameter Value(s) Access copper line cable type & length N/A In-house copper line cable Untwisted, twisted Cat3 and Cat5 In-house power line cable Some type of unbalance and resonances

(spurs, open ended leads, ISN...) should be considered. ISN is preferred

Location of PLT Device (same power strip / IAD ?) N/A Length of co-localized DSL & PLT cables (m) 1, 5, 20, 40 m Space between DSL & PLT cables (cm) Contact, 1cm, 6cm DSL filter type (splitter/inline filters) N/A PLT filter (yes/no) N/A VDSL2 configuration(s) N/A Procedure The following procedure will be applied:

- Measure the PSD on the electricity line (peak detector with 10 kHz RBW) with maximum UDP traffic. This measurement will be repeated if the PLT modems are reconfigured during the test.

- For each type of copper line (DSL cable), each length of co-localized DSL & PLT cables, and each space between these cables:

o Connect the two PLT devices and generate maximum UDP traffic between Plug #1 and Plug #2.

o Measure the (peak detector) PSD within the [20 kHz, 30 MHz] frequency band (expressed in dBm/Hz).

- For the worst case of the above: o Connect the two PLT devices and generate maximum TCP traffic between Plug #1

and Plug #2. o Measure the (peak detector) PSD within the [20 kHz, 30 MHz] frequency band

(expressed in dBm/Hz).

Results PSDs for each topology and each PLT device. Estimated duration of the tests 8h per PLT technology.


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6.2.2 Performance tests Objective Check the impact of:

- the type of in-house DSL & PLT cables - the length & space between DSL and PLT cables - the location of the PLT-device - the DSL splitter type - the presence or not of a PLT filter

on the VDSL2 and the PLT links by analysing the PHY layer statistics reported by the DSLAM and by analysing the impact on the PLT traffic. Description Test bed #2 Parameters P0/ VDSL2 benchmark test without any coupling Parameter Value(s) Access copper line cable type & length PE-04mm / very short, short, medium and long

loops (see §6.1.2). In-house copper line cable twisted pair CAT3 cable In-house power line cable No Location of PLT Device (same power strip / IAD) No Length of co-localized DSL & PLT cables (m) No Space between DSL & PLT cables (cm) No DSL filter type (splitter/inline filters) No PLT filter (yes/no) No VDSL2 configuration(s) 3 configurations P1/ Evaluation of the impact of coupled interferences P1.1/ Initial test Parameter Value(s) Access copper line cable type & length PE-04mm / very short, short, medium and long

loops (see §6.1.2). In-house copper line cable twisted pair CAT3 cable In-house power line cable 2.5mm with forced unbalance Location of PLT Device (same power strip / IAD) Separate power strip Length of co-localized DSL & PLT cables (m) 20m Space between DSL & PLT cables (cm) Contact, 1cm, 6cm and 20cm DSL filter type (splitter/inline filters) In line filters PLT filter (yes/no) No VDSL2 configuration(s) 3 configurations


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P1.2/ Additional test with Master splitter Parameter Value(s) Access copper line cable type & length PE-04mm / very short, short, medium and long

loops (see §6.1.2). In-house copper line cable twisted pair CAT3 cable In-house power line cable 2.5mm with forced unbalance Location of PLT Device (same power strip / IAD) Separate power strip Length of co-localized DSL & PLT cables (m) 5m Space between DSL & PLT cables (cm) 1cm, 6cm or 20cm (to be defined after P1.1)3 DSL filter type (splitter/inline filters) Master splitter PLT filter (yes/no) No VDSL2 configuration(s) 3 configurations P1.3/ Additional test with other indoor wirings Parameter Value(s) Access copper line cable type & length PE-04mm / very short, short, medium and long

loops (see §6.1.2). In-house copper line cable twisted pair CAT5 cable In-house power line cable 2.5mm with forced unbalance Location of PLT Device (same power strip / IAD) Separate power strip Length of co-localized DSL & PLT cables (m) 20m Space between DSL & PLT cables (cm) Contact, 1cm, 6cm or 20cm (to be defined

after P1.1)4 DSL filter type (splitter/inline filters) In line filters PLT filter (yes/no) No VDSL2 configuration(s) 3 configurations P2/ Evaluation of the impact of conducted interferences: P2.1/ Initial test Parameter Value(s) Access copper line cable type & length PE-04mm / very short, short, medium and long

loops (see §6.1.2). In-house copper line cable twisted pair CAT3 cable In-house power line cable 2.5mm Location of PLT Device (same power strip / IAD) Same Length of co-localized DSL & PLT cables (m) 0m Space between DSL & PLT cables (cm) N/A DSL filter type (splitter/inline filters) Master splitter PLT filter (yes/no) No VDSL2 configuration(s) 3 configurations

3 The space between DSL and PLT cable will be selected after P1.1 (the maximum space that is reported in P1.1 to degrade an HD video stream). 4 The space between DSL and PLT cable will be selected after P1.1 (the maximum space that is reported in P1.1 to degrade an HD video stream).


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P2.2/ Additional test coverage to evaluate the impact of PLT filters and filtered power strips Parameter Value(s) Access copper line cable type & length PE-04mm / very short, short, medium and long

loops (see §6.1.2). In-house copper line cable twisted pair CAT3 cable In-house power line cable 2.5mm Location of PLT Device (same power strip / IAD) Same Length of co-localized DSL & PLT cables (m) 0m Space between DSL & PLT cables (cm) N/A DSL filter type (splitter/inline filters) Master splitter PLT filter (yes/no) Yes VDSL2 configuration(s) 3 configurations Procedure The following procedure will be applied: P0/ VDSL2 benchmark test without any coupling

- For each Access copper line length and each VDSL2 configuration: o Open the VDSL2 port of the DSLAM o Let the CPE to enter showtime. Wait to one minute. o Report the VDSL2 statistics (US & DS bitrates & noise margins, …). o Keep the synchronisation for at least 1 minute and report the number of VDSL2 CRCs

in each direction (up & downstreams), as well as the amount of resyncs, ES, SES, amount of showtime, and, if not impacting the overall test duration, other carrier data like SNRi, QLN, bi, gi, tssi, Hlog (SNRi and bi are more important).

P1/ Evaluation of the impact of coupled interferences

- Configure the in-house cabling. - Connect the PLT plugs and the VDSL2 IAD. - Initiate HD video UDP traffic from the DSLAM. - For each Access copper line length and each VDSL2 configuration:

o Open the VDSL2 port of the DSLAM o Let the CPE to enter showtime. Wait to one minute. o Report the VDSL2 statistics (US & DS bitrates & noise margins, …). o Keep the synchronisation for at least 1 minute and report the number of VDSL2 CRCs


o Report the bitrate, number of frames lost on the PLT link or the Byte Error rate. o Unplug, wait for 10s, and plug again the PLT device close to the VDSL2 IAD and

check the impact on the VDSL2 link (CRC, resync, etc.). During the Plugtest it is desirable, if time permits, to repeat one of P1 tests having the VDSL2 link operational before connecting the PLT devices to verify the effect of PLT on the VDSL2 link stability. P2/ Evaluation of the impact of conducted interferences

- Configure the in-house cabling. - Connect the PLT plugs and the VDSL2 IAD. - Initiate HD video UDP traffic from the DSLAM. - For each Access copper line length and each VDSL2 configuration:

o Open the VDSL2 port of the DSLAM o Let the CPE to enter showtime. Wait for one minute. o Report the VDSL2 statistics (US & DS bitrates & noise margins, …). o Keep the synchronisation for at least 1minute and report the number of VDSL2 CRC


o Report the bitrate, number of frames lost on the PLT link.


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Results VDSL2 and PLT statistics for each topology and each PLT device. Mean Opinion Score will be measured also for video quality verification. If the appropriate tool is not available, then subjective verification will be performed on tests determined by the participant. Estimated duration of the tests P0 VDSL2 benchmark without any coupling: 1h P1.1 Initial test coverage / coupled interferences: 4h/PLT P1.2 Additional test coverage / coupled interferences: 1h/PLT P1.3 Additional test coverage / coupled interferences: 1h/PLT P2.1 Initial test coverage / conducted interferences: 1h/PLT P2.2 Additional test coverage / conducted interferences: 1h/PLT


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7 Organisation

7.1.1 PLT devices Each PLT device that will be tested during this Plugtests™ is an original PLT product representative of:

- One PLT technology, - One specific Analog Front End, - One specific implementation of the related technology.

7.1.2 Participants The participants of this Plugtests™ will be:

- PLT manufacturers that will provide their own PLT solutions and expertise, - One VDSL2 manufacturer to provide the VDSL2 CPE and its related expertise. - One VDSL2 manufacturer to provide the VDSL2 DSLAM and its related expertise. - One STB manufacturer to provide the HD IPSTB and its related expertise. - One DSL filters manufacturer to provide the DSL filters and its related expertise.

Different copper pair cables as well as power line cables would have to be provided for the Plugtests™. Nevertheless, it is not planned, for cable manufacturers to participate to the Plugtests™.

Available at LAN To be developed Participants to provide

Facilities

Meeting rooms (2) Furnishing

Test Bed VDSL2 DSLAMs Line simulators VDSL Test platform PC computers Chariot SW

Test bench (POTS and Mains cabling set up) Reference file for Video content

DSL filters PLT filters VDSL2 IADs Audio-Video STB Video server and set up

Equipment under Test PLT devices Instrumentation Spectral analyzer

video quality test tool

(Mean Opinion Score values)

Internet Connexion Analogue, wifi Local support Train/plane/Hotel

7.1.3 Confidentiality All participants in the Plugtests™ have signed a mutual NDA. At the upcoming PLT Plugtests™ 25-29 May 2009 related to the coexistence between VDSL2 and in-door PLT, a daily debriefing session between the participants, LAN and ETSI, is planned. The aim of these sessions is to analyze the results of the daily testing and decide what can be included in the anonymous report. In accordance with the NDA, ETSI will ensure that no confidential/private information will appear in the final Plugtests™ report. Furthermore, the report will only show anonymous results.


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7.1.4 Calendar We propose the following calendar:


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8 Conclusion Laboratoire des Applications Numériques is willing to host the Plugtests™ on VDSL2 and in-door PLT technologies. It is proposed to run complementary test set-ups to the previous that enable coexistence tests where 3-Play services are deployed on representative configurations. Also some preventive devices like POTS Splitters or Filtered Power strips are included in the test plan.

End of document

Documents

VDSL2 and in-door PLT coexistence - · PDF fileVDSL2 and in-door PLT coexistence Plugtests™ Event May 25-29, 2009 Test Plan ... VDSL2 services are provided by a DSLAM located close