PTP_Mobile_Backhauling_Acceptance_Tests_(Joachim_Atzwanger,_Telekom_Austria)

Slide 1AJ2 Hello!My name is Atzwanger Joachim.I work for telekom Austra in the business synchronisation since 10 years.Telekom Austria is the key player on the wireline and wireless market.I am responsibel for clock concepts, distribution,recovery, product selection, customer solutions and last not least clock quality.Now we have to accept the challange to implemtPTP in your networkTherfore 1 creat acceptance tests.Atzwanger Joachim, 02/11/2008Slide 2AJ3 Here you see a overvew.I decided for this sequence of the different testsThe main issue of this test cases is how robust are the now availbale ptp SolutionsMissing test cases are:Bandwith consumptionPTP over VPLS, MPLS ?UseabilitySecurity,GroundingSurge, Electromagnetic compatibilityNMS ....At the beginning we have no idea about PTP.First we decided to analyse our network.Atzwanger Joachim, 02/11/2008Slide 3AJ4 Measuremt period; 1h )3600 seconds10 Frames/sec for synchronization frame <length = 90 Byte = ptp Sync MAditional frames with diffferent priorization andchelcked the impact of gifferent network loadsAtzwanger Joachim, 02/11/2008Slide 4AJ5 Here you can see an overview.I was astonished about radio link and SHDSL.Differential Service Code Point (DSCP) ist die Bezeichnung für das Type of Service-Feld (ToS) im IP-Header von DiffServ.In detail:MPLS nodes with less Traffic generate internet distribution. The more nodes the more traffic the more the distribution changes to quasi Gaussian distribution.SHDSL:Distribution:QoS (DSCP differential service code point) extrely dependent;Radio Link: quasi Gaussian distribution.modulation and QoS dependentAtzwanger Joachim, 02/11/2008Slide 5AJ6 Practcal View:Exchang of EquipmentYou will see the Quality of the oszillatorBack to back is a basic test:With 2 Tester you can make one Longtimemeasuremt, wih the the second you check the clockquality at time.To get to know the grandmaster and slave monitor the logs. There you see the progess of the ptp sychronisation process.I will encourage to work with Wireshark.You can watch the event- generl massagesSync M , Delay request, Delay Respns, Announce M etc.You can see themesage attributes ...In this way you really get to know ptp!Measrement setup:Cold startwarm startone step clock: A clock that provides time information using a single event massagetwo step clock: A clock that provides time infomation using the combinatuon of an event message and a subseqent genaral maeeage Event message:SyncDelay RequestPdelay requestPdelay responsGneral M:AnnounceFellow upDelay ResponsManagementSignallingAtzwanger Joachim, 02/11/2008Stability TestIEEE1588GPSIEEE1588SlaveMPLS/ MPLS+ Radio/GrandmasterE1Tester Jitter/ WanderMPLS + XDSLEthernet Network TerminationTraffic G tStability TestsGenerator CaseGMSlaveTraffic Generator TesterMeasurementPeriod (sec)Sync M/Sec2. Step Delay R.LogsLoad/ overload different queuesTIE, MTIE, TDEV10000321000064100001281000003210000064100000128Atzwanger Joachim PTM TRA6Slide 7AJ7 Why is a holdofer test impotant:Syncchain: GM - Slave - Node B1. Check the" input autonomous time"2. Good Osziilators can compensate network distortion2. In the following Test cases the holdover of the slave can be the reason that no Clock quality change will occureAtzwanger Joachim, 02/11/2008Slide 8AJ8The transient respons time can be larger as back to back connectionAtzwanger Joachim, 02/11/2008Slide 9AJ9Repetion concerning G.8261 Timing and synchronization aspects in Packet NetworksI think that model 2 is better to stress network concerning ptp features.You see here test case 1Atzwanger Joachim, 02/11/2008MPLS Network with priorisationGPSNE 1NE 2IEEE1588GrandmasterE1IEEE1588SlaveTester MPLS LABEthernet Network Traffic GeneratorTester Jitter/ WanderTerminationPerformance tests: G.8261 Test Case 1 MPLS LABGMSlaveTraffic Generator TesterJitter/WanderMeasurement Sync2 Step/TIE MTIE TDEV Period in hM/SecDelay R.LogsLoad Model 2TIE, MTIE, TDEV1h 32No /1h 64No /1h 128No /1h 32Yes /1h 64Yes /1h128Yes /G.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurementAtzwanger Joachim PTM TRA11Slide 11TAA1 WE decided to use Traffic pattern from G.8261.Advantage:bigger chance to compare to other test results!In the log where ptp events are memorized you willsee mor action!Telekom Austria AG, 02/11/2008GPSNE 1NE 2IEEE1588GrandmasterE1IEEE1588SlaveTester MPLS LABEthernet Network Traffic GeneratorTester Jitter/ WanderTerminationPerformance tests: G.8261 Test Case 2 MPLS LABGMSlaveTraffic Generator TesterJitter/WanderMeasurement Sync 2 Step/Different Loads TIE MTIE TDEV Period in hM/SecDelay R.LogsMod 1 ,2TIE. MTIE, TDEV Model 1, Model 24h 32No /Distribution, Jitter 4h 64No /Distribution, Jitter4h 128NO /4h 32Yes /Distribution, Jitter 4h 64Yes /Distribution, JitterG.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurement4h128Yes /Atzwanger Joachim PTM TRA12GPSNE 1NE 2IEEE1588GrandmasterE1IEEE1588SlaveTester MPLS LABEthernet Network Traffic GeneratorTester Jitter/ WanderTerminationPerformance tests: G.8261 Test Case 3 MPLS LABGMSlaveTraffic Generator TesterJitter/WanderMeasurement 2 Step/Load Model 12TIE MTIE TDEVperiod in h Sync M/SecDelay RLogsLoad Model 1,2TIE. MTIE, TDEV Model 1 Model 224h 32No /Distribution, Jitter 24h 64No /Distribution, Jitter24h 128Yes /24h 32Yes /Distribution, Jitter 24h 64Yes /Distribution, JitterG.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurement24h128Yes /Atzwanger Joachim PTM TRA13Slide 14AJ15In some ares is no fibre ia avaiable therefor radio Link System are the solution.QAM = QPSK = Quadratur phas shift Keying(VierphasenmodulationRadio link System changes from 32QAM to 16 QAMand so on if the BER is to high / Receive level decreas to much.Bit: Bei 256-QAM sind das 256 Punkte in einem 16x16-Raster (bei DVB-C wird diese Konstellation z.T. im UHF-Bereich eingesetzt)Atzwanger Joachim, 02/11/2008Radio Link System32QAM, 16QAM, QPSK+MPLSGPSMPLSLABNE 1NE 2Radio Link SystemT ffi IEEE1588GrandmasterE1IEEE1588SlaveTester Ethernet Network Traffic GeneratorTester Jitter/ WanderPerformance tests: G.8261 Test Case 2 Radio Link+ MPLS LABTerminationGMSlaveRadio Link SystemTraffic G.LoadTester Jitter/ Wander Model 1 Model 2Test Time Sync M /Sec 2. Step/Delay R.Logs32QAM16QAMPAMModel 1, 2TIE, MTIE, TDEVy 4h 32No /4h 64No /4h 128No //4h 32Yes /4h 64Yes /4h128Yes /G.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurementAtzwanger Joachim PTM TRA15Radio Link System 32QAM, 16QAM, QPSK+MPLSGPSMPLSLABNE 1NE 2Radio Link SystemT ffi IEEE1588GrandmasterE1IEEE1588SlaveTester Ethernet Network Traffic GeneratorTester Jitter/ WanderPerformance tests: G.8261 Test Case 3 Radio Link+ MPLS LABTerminationGMSlaveRadio Link SystemTraffic G.LoadTester Jitter / Wander Model 1 Model 2Test Time Sync M /Sec 2. Step/Delay R.Logs32QAM16QAMPAMModel 1 , 2TIE, MTIE, TDEVy 24h 32No /24h 64No /24h 128No //24h 32Yes /24h 64Yes /24h128Yes /G.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurementAtzwanger Joachim PTM TRA16GPSMPLSLABNE 1NE 2SHDSLT ffi IEEE1588GrandmasterE1IEEE1588SlaveTester Ethernet Network Traffic GeneratorTester Jitter/ WanderPerformance Tests: G.8261 Test Case 1 SHDSL MPLSTerminationGMSlaveTraffic Generator Tester J & WTest Time in hSync M/Sec2. Step/Delay R.LogsLoad Model 2TIE,MTIE,TDEV1h 32No /1h 64No /1h 128No /1h 32Yes /1h 64Yes /1h128Yes /G.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurementAtzwanger Joachim PTM TRA17GPSMPLSLABNE 1NE 2SHDSLT ffi IEEE1588GrandmasterE1IEEE1588SlaveTester Ethernet Network Traffic GeneratorTester Jitter/ WanderPerformance Tests: G.8261 Test Case 2 SHDSL MPLSTerminationGMSlaveTraffic Generator Tester J & WTest Time in hSync M/Sec2. Step/Delay R.LogsLoadModel 1 , 2TIE,MTIE,TDEVModel 1 Model 24h 32No /4h 64No /4h 128No /4h 32Yes //4h 64Yes /4h128Yes /G.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurementAtzwanger Joachim PTM TRA18GPSMPLSLABNE 1NE 2SHDSLT ffi IEEE1588GrandmasterE1IEEE1588SlaveTester Ethernet Network Traffic GeneratorTester Jitter/ WanderPerformance Tests: G.8261 Test Case 3 SHDSL MPLSTerminationGMSlaveTraffic Generator Tester J & WTest Time in hSync M/Sec2. Step/Delay R.LogsLoadModel 1 , 2TIE, MTIE, TDEV Model 1 Model 224h 32No /24h 64No /24h 128No /24h 32Yes //24h 64Yes /24h128Yes /G.8261: Allow a stabilization period according to Appendix II for the clock Recovery prozess to stabilize before doing the measurementAtzwanger Joachim PTM TRA19Slide 20AJ11Goal: which network disturbance causes a change of the ptp sourceAtzwanger Joachim, 02/11/2008Slide 21AJ12 Why robustness tets?normally test Labs are to smal,l to represent the live network.One possibility to reach live network disturbance is to add delay and PDV with an network emulatorHere it is one way descibed how to do it.Atzwanger Joachim, 02/11/2008Slide 22AJ13 The pictire is a screen shot of a netwok emulator.You configure average delay, MIn, Max, MaxMax ∆ Negativ or positiv and the spread.Atzwanger Joachim, 02/11/2008Slide 23AJ14 Atzwanger Joachim, 01/11/2008Robustness test symmetric;Network Simulator1588 Slave Grandmaster TesterJitter / WanderNr Max Δ()Spread Down Up Delay FollowuplLogs Sync M/Metric(µsec) neg= Pos)about Requests DelayRequestssec G.823 OffestSEC PDH df/F1A151x x1B5x x1C7,5x x1D10x x1E15x x2A201x x2B5x x2C7,5x x2D10x x3A251x x3B5x x3C7,5x x3D10x xAtzwanger Joachim PTM TRA24Robustness test asymmetric;impairment downstreamNetwork Simulator1588 Slave Grandmaster TesterJitter / WanderNr Max Δ()Spread Down Up Delay FollowuplLogs Sync M/Metric(µsec) neg= Pos)about Requests DelayRequestssec G.823 OffestSEC PDH df/F1A151x1B5x1C7,5x1D10x1E15x2A201x2B5x2C7,5x2D10x3A251x3B5x3C7,5x3D10xAtzwanger Joachim PTM TRA25Robustness test asymmetric; impairment upstreamNetwork Simulator1588 Slave Grandmaster TesterJitter / WanderNr Max Δ()Spread Down Up Delay FollowuplLogs Sync M/Metric(µsec) neg= Pos)about Requests DelayRequestssec G.823 OffestSEC PDH df/F1A151x1B5x1C7,5x1D10x1E15x2A201x2B5x2C7,5x2D10x3A251x3B5x3C7,5x3D10xAtzwanger Joachim PTM TRA26Which clock relevant parameters areSlide 27AJ16 Demanding customer ask for SLA regarding Clock Quality at Node Atzwanger Joachim, 02/11/2008Many Thanks!Questions?Q ti?joachim.atzwanger@telekom.atj hi@l kAtzwanger Joachim PTM TRA28。