1、 ETSI TR 102 615 V1.1.1 (2008-02)Technical Report PowerLine Telecommunications (PLT);Plugtests 2007 on coexistencebetween PLT modem systems;Test casesETSI ETSI TR 102 615 V1.1.1 (2008-02) 2 Reference DTR/PLT-00023 Keywords ACCESS, intelligent homes Essential, or potentially Essential, IPRs notified
2、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
3、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 Report (TR) has been produced by ETSI Technical Committee PowerLine Telecommunications (PL
4、T) STF 332. The present document describes test cases prepared for a Plugtests event on coexistence between PLT modem systems. Introduction The Plugtests on the coexistence between PLT modem systems are performed to confirm the robustness of the CDCF as defined in PLT WI20 PLT39_TD_19a1.zip and to v
5、erify the protocol by tests on prototypes of different vendors, as available. A Special Task Force (STF) 332 was established to model the CDCF mechanism on sub MAC layer, to define suitable test cases for the Plugtests and to perform and report the results of the Plugtests. The aim of the Plugtests
6、is to verify the coexistence protocol given in the PLT WI20 drafts. The tasks of the STF with regard to PLT WI20 Plugtests are in detail: Describe and identify Plugtests to be done; Prepare test beds for the Plugtests; Perform the Plugtests; and Report the results of the Plugtests. ETSI ETSI TR 102
7、615 V1.1.1 (2008-02) 5 1 Scope The test cases defined in the present document are designed to verify the coexistence mechanism as defined in PLT-WI20 drafts. They are applicable to PLT modems (Access and Inhouse), in which the coexistence mechanisms are at least partly implemented. Since a monitorab
8、le reference device is not yet available, it is required that the PLT modems used for the tests have built-in monitoring abilities. Results of the verification of the proposed mechanism may be used to improve coexistence between PLT systems. 2 References References are either specific (identified by
9、 date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. Non-specific reference may be made only to a complete document or a part thereof and only in the following cases: - if it is accepted that it will be possible t
10、o use all future changes of the referenced document for the purposes of the referring document; - for informative references. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. For online referenced documents,
11、 information sufficient to identify and locate the source shall be provided. Preferably, the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the reference should, as far as possible, remain valid for the expected life of the document. The refe
12、rence shall include the method of access to the referenced document and the full network address, with the same punctuation and use of upper case and lower case letters. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term val
13、idity. 2.1 Normative references The following referenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. Not a
14、pplicable. 2.2 Informative references 1 IEC 61000-4-4: “Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test“. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 6 3 Abbreviations For the purposes of the present document, the following
15、 abbreviations apply: AC Alternating Current BNC Bayonet Nut Connector CDB coupling/decoupling box CDCF Commonly-Distributed Co-ordination Function FDM Frequently Division Multiplexing MTU Maximum Transmission Unit PLT PowerLine Telecommunications (http:/www.etsi.org/plt) PSD Power Spectral Density
16、RF Radio Frequency TCP Transmission Control Protocol UDP User Datagram Protocol 4 General Test Conditions, Traffic Generation and Traffic Monitoring Usually the PLT modems build a bridge between the powerline as transport media and a standard communication line (e.g. ethernet). For the tests, in whi
17、ch traffic is to be generated and to be monitored, the use of the public domain tool IPERF (http:/ will be used. The participant should bring with him the required computer with appropriate interfaces for his modem. In case of UDP traffic the following settings apply: stream type packet size data ra
18、te UDP 1 500 byte (MTU) 10 % to 100 % of maximum for PLT system as determined in pretests in steps of 10 % Since TCP uses congestion mechanisms, which may limit the traffic due to packet losses, some tests will be performed using TCP instead of UDP. This may be more realistic for quality perceived b
19、y the user. Since a monitorable reference device is not yet available, it is required that the PLT modems used for the tests have built-in monitoring abilities for the coexistence mechanism. This monitoring should include: Master or Slave synchronised with CDCF frames which resources do a modem try
20、to acquire which S- or D-slot(s) are allocated which priority slots are reserved amount of traffic is received or transmitted amount of traffic within the own system The coexistence mechanism also needs to be stimulated by generation of specific CDCFs. This stimulation should allow to realise Access
21、 / Inhouse (if possible) high / low priority streaming S-Slot, D-Slot, tacit D-slot allocation passive / active resynchronisation ETSI ETSI TR 102 615 V1.1.1 (2008-02) 7 The participant is free to select the tests listed in the following sections he wants to perform. For each given selected tests, t
22、he part of it that can not be performed will be noted and the rest will be performed. Many of the coexistence tests require two PLT systems of different vendors or types. These tests can only be performed in agreement with all participants concerned. 4.1 Coupling and Decoupling of the PLC-Signal The
23、 central element of the modular artificial test environment is a coupling/decoupling box (CDB) as shown in figure 4.1. It consists of a decoupling filter (60 dB for both symmetric and asymmetric signals) between power plug and mains connector and a coupling network (two capacitors, transformer and s
24、everal resistors). The resistors are designed for a 50 termination seen from each BNC connector. An RF-impedance of 100 can be measured into the power plug. The attenuation between the coaxial inputs and power plug depends on the dimensioning of the resistors and the RF-transformer. For all tests th
25、e resistors will be chosen to have an attenuation of about 16 dB between coaxial input and power plug, whereas the attenuation between two coaxial inputs is about 11 dB (see figure 4.2). mainsfiltermainsmains toother boxesconnector for unterminated line or passive filter (simulation of resonances, B
26、NC)connectors to otherBoxes (BNC)power plugFigure 4.1: Coupling/decoupling box as central element of the modular artificial test environment mains filtercoupling unit16dB11dB16dBFigure 4.2: Attenuation of the CDB ETSI ETSI TR 102 615 V1.1.1 (2008-02) 8 With several of the boxes connected via cables
27、and attenuators complex network structures can be realised. Unused BNC connectors (intended for connections to other boxes) shall be terminated with 50 . 4.2 Shielding of the Test Set-up Shielding the entire test set-up is mandatory for reproducibility. For small set-ups simple metal cases can be us
28、ed. For larger set-ups the occupied space is more and more a problem. For the proposed set-up a locker with the corresponding number of sockets is the best solution. This needs some work for RF-improvement as well as some modifications like holes for cabling. Because of the flexible cabling concept
29、any scenario can be tested as long as the maximum number of needed compartments is not exceeded. The dimension of the boxes provided by ETSI is 457 mm 457 mm 460 mm (outer dimensions). If the modem does not fit into this box the participant is invited to bring four suitable shielding cases / methods
30、. Alternatively the tests will be performed without shielding. If the parasitic coupling between the modems is too large, the interpretation of the test results may be difficult. 5 Tests with one PLT system In the following tests the PLT modem/system means: a) a single PLT modem; or b) a pair of PLT
31、 modems combined in a multiple socket. depending on the properties of the PLT system. 5.1 CDCF Timing - Comparison with Simulation Model Necessary PLT equipment PLT-modem / system with ability to initiate transmission of CDCF and to define slot usage. Test instrumentation CDB. Oscilloscope, AC line
32、cycle triggered. Modelling Tool. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 9 Test Set-Up mains filtercoupling unitPLT modem/systemCDCF generationoscilloscopeOperation condition of PLT modem/system Generation of CDCF (no data). Setting of test instrumentation Modem switched on - Start of synchronisation.
33、 Collected data Timing of the CDCF. 5.2 CDCF - PSD Necessary PLT equipment PLT-modem / system with ability to initiate transmission of CDCF and to define slot usage. Test instrumentation CDB. Spectrum Analyser. Modelling Tool. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 10Test Set-Up mains filtercoupling
34、unitPLT modem/systemCDCF generationspectrumanalysermainsSetting of test instrumentation Operation condition of PLT modem/system Generation of CDCF (no data). For Access Modems: Dynamic Frequency allocation. Collected data Nominal slot usage. PSD of the CDCF. 5.3 CDCF Timing - Sync Point and AC line
35、cycle Necessary PLT equipment PLT-modem / system with ability to initiate transmission of CDCF and to define slot usage. Test instrumentation CDB. Oscilloscope. Artificial power supply with ability to produce harmonics. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 11Test Set-Up mains filtercoupling unitPLT
36、 modem/systemCDCF generationoscilloscopeartificial ACpower supplyOperation condition of PLT modem/system Generation of CDCF (no data). Setting of test instrumentation Artificial power supply: Fundamental: 50 Hz, 230 V. 25thHarmonic, 15 % of fundamental. Collected data Timing of the CDCF. 5.4 CDCF Ti
37、ming - Burst Necessary PLT equipment PLT-modem / system with ability to initiate transmission of CDCF and to define slot usage. Test instrumentation CDB. Oscilloscope. Burst-Generator according IEC 61000-4-4 1. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 12Test Set-Up mains filtercoupling unitPLT modem/sy
38、stemCDCF generationoscilloscopeburst generatormainsOperation condition of PLT modem/system Generation of CDCF (no data). Setting of test instrumentation Burst generator: Burst signal 5 n/50 ns, 5 kHz repetition frequency, burst length 15 ms, burst period 300 ms, amplitude 500 V. Collected data Timin
39、g of the CDCF. 6 Tests with more PLT systems 6.1 CDCF reception in dependence of attenuation Necessary PLT equipment PLT-modem / system with ability to initiate transmission of CDCF and to define slot usage. PLT-modem / system from another participant with ability to monitor CDCF reception. Test ins
40、trumentation 2 CDB. Attenuator. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 13Test Set-Up mains filtercoupling unit2nd modem/systemmains filtercoupling unitVar Att.1st modem/systemCDCF generationCDCF monitoringOperation condition of PLT modem/system 1stPLT modem/system: Generation of CDCF (no data). 2ndPL
41、T modem/system: Observation of received CDCF. Setting of test instrumentation Attenuation is increased by steps of 10 dB. Collected data Received CDCF in dependence of attenuation 6.2 CDCF reception in the presence of a narrowband disturbance source Necessary PLT equipment PLT-modem / system with ab
42、ility to initiate transmission of CDCF and to define slot usage. PLT-modem / system from another participant with ability to monitor CDCF reception. Test instrumentation 2 CDB. 2 Attenuators. RF-Signal-generator. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 14Test Set-Up mains filtercoupling unit2nd modem/
43、systemmains filtercoupling unitVar Att.1st modem/systemCDCF generationCDCF monitoringVar Att.RF generatorOperation condition of PLT modem/system 1stPLT modem/system: Generation of CDCF (no data). 2ndPLT modem/system: Observation of received CDCF. Setting of test instrumentation Attenuation of both a
44、ttenuators adjusted for a total attenuation of 40 dB. RF generator successively at 1 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz and 25 MHz. Level is increased by steps of 10 dB. Collected data Received CDCF in dependence of RF generator level for the different frequencies 6.3 CDCF reception in the presence
45、of a broadband disturbance source Necessary PLT equipment PLT-modem / system with ability to initiate transmission of CDCF and to define slot usage. PLT-modem / system from another participant with ability to monitor CDCF reception. Test instrumentation 2 CDB. 2 Attenuators. Noise-generator. Spectru
46、m analyser. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 15Test Set-Up mains filtercoupling unit2nd modem/systemmains filtercoupling unitVar Att.1st modem/systemCDCF generationCDCF monitoringVar Att.Noise generatorspectrumanalyserOperation condition of PLT modem/system 1stPLT modem/system: Generation of CD
47、CF (no data). 2ndPLT modem/system: Observation of received CDCF. Setting of test instrumentation Attenuation of both attenuators adjusted for a total attenuation of 40 dB. RF generator successively at 1 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz and 25 MHz. Level is increased by steps of 10 dB. Collected da
48、ta Received CDCF in dependence of noise generator level for the different frequencies. Spectrum at the receivers side. 6.4 Coexistence - Slot allocation Necessary PLT equipment PLT- system with ability to allow different CDCF (e.g. priority) and to monitor state of CDCF. PLT-system from another part
49、icipant with ability to allow different CDCF (e.g. priority) and to monitor state of CDCF. Test instrumentation 2 CDB. Attenuator. Oscilloscope. ETSI ETSI TR 102 615 V1.1.1 (2008-02) 16Test Set-Up mains filtercoupling unitmains filtercoupling unitVar Att.traffic generation/monitoringtraffic generation/monitoring)oscilloscope2nd system1st systemOperation condition of PLT modem/system 1stPLT system: CDCF with different slot usage. 2ndPLT system: C
