Presentation on theme: "Tap to Outlet Home Certification"— Presentation transcript:
1 Tap to Outlet Home Certification SCTE DVAC Chapter 4/18/12Larry JumpJDSUField Applications Engineer
2 Today's Agenda Home Certification Overview Certifying the Home What is Home Certification?Why do we need it?What is the technology?Certifying the HomeHome Certification Challenges in the fieldWhat affects ServicesWhat can and should be doneQuestions and Answers
3 Why Home Network Certification? Estimated that 70-75% of all trouble calls are due to problems inside the home.Estimated that between 90-95% of troubleshooting root cause of service issues inside a home is coax path relatedReplacing connectors, splitters, faulty coax, etc…CraftsmanshipThis is consistent with both QAM and MoCA servicesQAM signals are more susceptible to issuesQAM signals are maxed outNow more susceptible to other issuesGreater customer satisfaction through a more reliable networkHome certification has been proven to reduce costly repeat truck rolls.
4 Why should we do this “certification”? The best answer is:– to provide short and long term customer satisfaction by:Reducing repeat visitsReducing overall truck rolls over timeReducing unnecessary Refer to Maintenance callsProviding test data to tech responding to escalationBeing prepared for future technologiesAnother step closer to One and Done
5 Find and Fix DilemmaMissing marginal installations often leads to 3-1 find and fix scenario$125 install tech truck roll$125 network tech truck roll$125 service tech truck rollNetwork TechFieldTechFieldTech3 truck rolls that should have only required 1, 3-1At $125/roll, cost for repair was $375 or $250 extra cost!At $100/month average customer revenue, and a 50% margin, that means that about 5 months of profit are gone from this customerSaving only events per month, pays for a field instrument that can help prevent this scenario in less than 12 months.
6 What goes wrong?Excessive attenuation caused by too many splitters or long cable runsA drop amplifier that does not pass the entire required spectrumUn-terminated splitters or outletsPoor crimping or other connector issuesCable faults or other conductor flawsMany of these flaws are caused by poor craftmanship!
7 Why do we need to certify the home? Upcoming technologies will require an even more robust home network.MoCA supports a full-mesh network between all nodes, procedures must be modified to rate all segments, not just from the initial splitter to outlets but also STB-to-STB segments that may not include the initial splitter.Any number of components could be the cause, including bad connectors and splitters, amplifiers, band pass filters, un-terminated cables or excessive noise, distortion or interference that affects the part of the spectrum.
8 Benefits of Certification Customer doesn’t call BossBoss doesn’t get mad at techTech doesn’t take it out on dogHappy CustomersHappy BossHappy DogHappy Tech
9 Find Root Cause of Service Issues Troubleshooting Philosophy:Quickly find and fix the root cause of 80-90% of in-home related issues – the CoaxAllow operators to determine all Triple-Play & other newer services will work before connecting any CPE devices!Certify the home’s coax plant over all frequencies is correctIt doesn’t matter what service is running on the coaxFuture proof for eventual additional revenue
10 Testing is consistent across all techs and jobs Why do we need to do thisRemember the Goal –Help assure that work (service, install, etc.) is done correctly the first time, and verified with quantitative test data, hence reducing repeat service calls.You can ensure that the proper tests are taken for every required job and the test data is recorded.Testing is consistent across all techs and jobsTest data is reconciled against the work order system Quality standards are enforced for each job
11 What is Home Cert? Testing Standardization Verification Assurance Tap to TV, Modem, or Set Top BoxThe span of the network the Service /Install Tech controls.Using the test equipment providedStandardizationAll customers get the same tests All Techs run the same testsApple to ApplesVerificationEnsure that the testing was done correctlyAssuranceEnsure that corrective action is taken if requiredReportingProvide compliance information to managers and techniciansData Collection
12 Why this, instead of other back office tools? Because you are the one with the tool beltBecause you can move the test equipment around while you troubleshoot.Outlet to Ground Block to TapKnow at once when you have fixed, or found the location of the problemProvide measurement history at that location for future reference.
13 Summary so far Run the tests at jobs that require a test to be run Results are compared to user defined Pass/Fail limitsPass/Fail limits should be such that a fail means “must fix”Fix problems uncoveredOr validate they need escalation ( via test at Tap)Re-run test to verify correction of problemsResults are reported in terms of number of tests:that actually were performed versus number that SHOULD have been performedNumber of tests passedReporting is available grouped by System, Manager, Supervisor, or Technician.Goal is to achieve and maintain high compliance and passing numbers
14 By successfully implementing Home Certification Reduce repeat rate – lowering repeats caused by marginal signal conditionsCreate a system wide standard for acquiring & interpreting test resultsResults in standard and consistent procedures that ensure quality based on quantitative test dataImprove productivity by reducing repeat service callsImprove customer satisfaction levels, as customers do not have to keep experiencing the same problemProvide a central repository for test data provides management reports, trends for data analysis, efficiency of technician and productivity
16 System Workflow Diagram Daily electronic file with Work Order Information from billing systemImport ReportTPP RelationalDatabaseWeb ServerSaved Test Resultssent at end of day.Management ReportsTest Result QueriesSave test files taken at jobs into Folders
17 Stores test data, Compares test from meter with workorderdata Another viewTAPDrop CableHigh PassFilterGROUNDBLOCKDIGITAL SET-TOPHouse2-WayAmplifierDigital VoiceOLDER TV SETCOMPUTERETHERNETStores test data, Compares test from meter with workorderdataWork Order File from Billing SystemWorkorder info from Billing SystemTPP RelationalDatabaseWeb Server
18 How Work Orders are matched with Test Results CSG, DST, ICOMSs, CustomMinor differences between vendorsInformation in Work Order File:assigned Tech, Work Order Type, job number, account number, completion codes, job status, and completion date, Node, system ID, etc.Meter saves test named as account number or Job NumberInformation from meter(saved tests):Tech ID, Account Number or Job Number, Date/Time Saved, and of course, the test measurement dataServer: Application andDatabaseWork order InfoTest Data
19 Meter Synchronization Process Synchronization (upload) process allows tech to send data back to the serverAlso allows channel plans, test plan setup and , limit plans to be sent to the meter.Assure all meters use proper settingsConnect via the RF plant (DOCSIS channel) or Ethernet LAN, or available wireless networks.The Certification test data is sent back and saved in Application Database and the Certification Reports are created from this databaseServer: Application andDatabase2-way communicationRF, Wireless, or Ethernet
20 Testing RF networks in the Home TAPHouseDrop CableOLDER TV SETDIGITAL SET-TOPCOMPUTERDigital VoiceGROUNDBLOCK2-WayAmplifierHigh PassFilterETHERNET3-WaySplitterONLINE GAMINGeMTA-CABLE MODEM
21 Which outlet should we test? The Basics…..WhereTAPDrop CableHigh PassFilterGROUNDBLOCKDIGITAL SET-TOPHouse2-WayAmplifierDigital VoiceOLDER TV SETCOMPUTERETHERNETWhich outlet should we test?Pretty much common sense -Voice -Data -Largest TV
22 The Basics…What do we test – RF Layer Downstream RFLevelC/N ( Analog – Remember Analog?)Hum ( Analog – yep, still around, sometimes)Video/Audio Carrier Delta ( difference)MERBER(Drop Frequency Response)Upstream RFUpstream Tx LevelUpstream Tx Headroom
24 The Basics…What do we test - DOCSIS DownstreamLevelMERBERRegistrationConfiguration file, Gateway IP, Modem IP, BPI StatusDOCSIS 3 BondingUpstreamChannel assignment and BondingPacket LossThroughput ( Speed)VoIPcheck – simulated Digital Voice Packets
26 What do we test - Ingress Ingress can be included as one of the Home Certification testsCan be run before or after the inside the home testAtticPOTS15432
27 Testing the Home for Ingress Contribution 7 dB TAPDisconnect drop from tap and check for ingress coming from customer’s home wiringReturn EqualizerHouseDrop CableOLDER TV SETWIRELESS LAPTOPIf ingress is detected at tap end, repeat at ground block to localizeDIGITAL SET-TOPCOMPUTORHigh PassFilterVoIPGROUNDBLOCK2-WayAmplifierETHERNET3-WaySplitterONLINE GAMINGeMTA-CABLE MODEMINGRESS SPECTRUM MEASUREMENTS
28 Troubleshooting Tests What other tests does the tech have to troubleshoot if there is a problem:DQIQAM IngressDOCSIS TestsSmart Scan
36 Limit ( Pass/Fail) Values Can be set for up to 8 locations
37 Understand the results screen – and act on what it tells you… Understand the results screen – and act on what it tells you….know what failed and why
38 Certification: The tech needs to know how to….. Know which job types to testKnow which outlet to testKnow which channel plan is the right one to useKnow how to name and save the testKnow how to understand what failed, if there is a failKnow how to fix or report what failed, know how to escalate and verify why that escalation is needed.Know how and when to synchronize the meter with the server.
40 MoCA ParametersMoCA uses the existing coaxial cable plant in a subscriber’s home as the connecting media for devices on a home network.MoCA 1.1 provides a 16-node solution175 Mbps will always be available to more than 95 percent of the nodesBER target of 1 x 10-9.Communication between devices on a MoCA network is controlled by a node designated as the network coordinator (NC)Nodes need to be able to transmit RF carriers at 55 dBmV to overcome splitter port to port isolation. Sometimes 2 splitters.
41 An In-Home Network, Physical Layer AtticCrawl SpaceSplitterNC
42 MoCA Node DiscoveryA node joins a MoCA network by listening for a beacon signal from the NCAfter receiving the beacon signal, a new node sends an admission request to join the network.If no beacon is heard, the new node assumes it is the first and begins transmission of its own beacon.MoCA 1.1 completes the probe and beacon tasks faster than its predecessor MoCA 1.0. This allows an increase in the maximum number of nodes from eight to 16 and provides a throughput increase from 100 to 175 Mbps network throughput for 95 percent of the nodes.
43 MoCA OptimizationIn addition to cable, the subscriber’s plant also contains splitters and sometimes amplifiers. MoCA equipped devices also need to be able to communicate through high-isolation output ports, in the forward as well as reverse directions.This is accomplished using a form of orthogonal frequency division multiplexing (OFDM) that is dynamically tailored to the individual paths in the subscriber’s coax network.“Probe” signals are periodically sent to the MoCA nodes on the plant to determine frequency response at each of the OFDM subcarrier frequencies.The optimal combination of constellation and frequency for each node is determined to achieve a BER of 1 x 10-9, resulting in constellations that can range from no symbols to 256-QAMBecause the electrical characteristics of the plant can change when the subscriber adds or removes devices, probes are sent on a periodic basis, and the OFDM scheme is changed as required.Because the network can vary widely between any 2 nodes, probe signals are sent periodically to evaluate the physical network between them. The nodes then construct an appropriate modulation profile that optimizes performance. Each node’s modulation profile is optimized for each of the other individual nodes.
44 MoCA 1.1Physical Layer Operates between 850 and 1525 MHz Each channel is 50 MHz wide in 1.1 or 100 MHz wide in 2.0In some cases, more than 1 channel is used at the same time to allow transport of 2 different logical networks.
45 MoCA Frequency Allocations MoCA 1.x Frequency ViewDownstream RangeMoCA 1.x RangeUpstream Range5 – 45 MHz55 – 1000 MHz850 – 1525 MHz5 MHz55 MHz1 GHz1.7 GHz50 MHzMoCA 2.0 Frequency ViewDownstream RangeMoCA 2.0 RangeUpstream RangeThe controller node in the network allocates a 50-megahertz channel between 850 MHz–1,525 MHz, in which all other nodes communicate. As seen in Figure 2, MoCA operates in a variety of bands that can be used by satellite providers, cablecos and telcos worldwide because it does not interfere with their current frequency plans for traditional broadcast TV service. In addition, multiple MoCA networks can operate on different bands on the same coaxial network.5 – 45 MHz55 – 1000 MHz500 – 1650 MHz5 MHz55 MHz1 GHz1.7 GHz100 MHz
46 MoCA MAC LayerThe NC determines how the nodes gain access the network to transmit and receive Ethernet frames.2 types of MAC layer framesControl frames contain management messagingBandwidth requestsMedia Access Plans MAPsData frames contain the end user application dataWhen a node wants to transmit, it first sends the NC a bandwidth request. The NC regularly transmits MAPs which are available time slots on a given frequency. The NC not only tells the transmitting node when to transmit but also tells the receiving node when to expect the transmission.
47 In-Home Logical Layer Diagram AtticNode ANode BNode A can communicate directly with Node B with direction from the NC.NCCrawl Space
48 MoCA 2.0 DetailsMoCA 2.0 (June 15, 2010) - Similar to MoCA 1.1 but with the following differences:Three new modes of operation:Basline Mode:400+ Mbps MAC throughput700 Mbps PHY RateSingle 100 MHz ChannelEnhanced Mode800+ Mbps MAC throughput1.4 Gbps PHY RateTwo bonded 100 MHz Channels (“Channel Bonding”)“Turbo” mode for a point-to-point configuration that allows:500+ Mbps MAC throughput between two connected devices when operating in Baseline mode1+ Gbps MAC throughput when operating in Enhanced modeAll three modes now have an extended frequency range500 MHz through 1650 MHz (center frequencies)Backward compatibility with MoCA 1.0 and 1.1 devicesMoCA 2.0 devices can operate at MoCA 2.0 speeds while MoCA 1.x devices are communicated to at their maximum respectable speeds on the same networkNOTE: MoCA 2.0 is different hardware than previous MoCA 1.1 HW versions
49 What does the future hold for home networks? WiFi has already surpassed wired in home networksApple sold 3 million IPads within the 1st 3 months of it’s releaseThere are now approximately 108 million IPhones worldwideWhile WiFi is widely used for data, up until now it has been deemed not reliable enough for video due to interference from such things as microwave ovens and cell phones.802.11n now provides for data rates up to 600Mbs on a 40MHz wide carrier802.11n also provides for the concept of multiple input multiple output (MIMO), providing for a maximum of four transmit antennas and four receive antennas.802.11n also provides for Dynamic digital beamforming,it monitors and adjusts the Wi-Fi signals based on real-time events that could affect performance. In combination with the 4 x 4 antenna scheme, beamforming can provide a 12dB-to-25dB improvement in reliabilityWith these 2 innovations, video can now be delivered reliably over wirelessWho wouldn’t choose wireless over a cabled connection? I hardly ever sit at my desk anymore. Set top boxes with a wireless interface.
50 More not too distant future stuff, DLNA Digital Living Network Alliance (DLNA) promotes wired and wireless interoperability of PCs, CEs, and mobile devices.A DLNA device works like any other network device by discovering other DLNA-enabled hosts.It learns their capabilities and exposes these features on the device's control display.Through DLNA, a media server can be located and then summoned to play or display a stored family photo, movie, music file, etc.DLNA-certified devices include TVs, PCs, set-tops, routers, game consoles, tablets, Blu-ray and DVD players, smartphones and audio receivers.The organization says it has certified more than 9,000 different devices.More than 440 million DLNA-certified devices were installed in users’ homes by the end of 2010
51 A Wireless In-Home DNLA Network Wireless RouterSplitterCrawl Space
52 Now – what are we NOT doing? We are NOT certifying the whole house (just yet)We ARE certifying an outletWhich is way better than not certifying anythingThe big reasons we don’t certify ALL outlets now is…….We don’t know how many there areWe don’t want to spend the time doing all outlets2-3 minutes per outlet, plus ingress scan, plus time to save, etc.
53 To completely verify the home network we would need to …. Verify signal quality at the Ground Block or Point of EntryVerify wiring from POE to each outletLossNoise/Ingress of each legFrequency response of each legIf we meet specs at the POE and verify wiring performance from POE to outlet….thenWe don’t need to run RF/MODEM tests at each outlet, do we?
54 Point of Entry (POE) Filter and Splitter Isolation A MoCA filter (aka: POE filter) performs two jobs.First it prevents the MoCA signal from entering a neighbors house by placing a filter at the input to the home networkSecond it gives MoCA a point of reflection for the signal because it requires the signals to bounce from output port to output port.There is approximately 30 dB of port to port isolation on a 2 way splitterMoCA/POEFilterThe filter restricts the high level MoCA signal from leaving the home network.Port to port isolation is about 30 dB for a 2 way, 34 for a 4 way, and 38 for an 8 way.55 dBmV in30 db down from oneport to the otherPOE25 dBmV out
55 What if……we could test multiple outlets…at once? TAPAtticSplitterWe could do all our up and downstream tests at the Ground block…XSplitterCrawl Space…And then verify that we had good performance from the ground block to each outlet?With 1 button push?
56 Mini-Probes… Each probe : has an F-Connector and a mini-USB port its own unique identifier letter ( A, B, C, D, etc)Sweeps Mhz – forward and reverseHas FDR function to determine distance to faultsHas noise detection to listen for and detect ingressMeter connects to one probe via USB, and controls test and displays results on screen.
57 Probe SetupAtticCrawl SpaceSplitterUSB toMini-USBPoint of Entryor Main SplitPut a probe at each location inside the home where a Set-top- box or Cable Modem will be located (or is desired to be tested)Connect that probe to the POE looking into the home toward CPE (ie: drop cable, ground block, or main split)Connect the probe to the meters USB portSmartID for In-home wiring survey and test in order to allow fault finding of service distribution via technologies such as DOCSIS, QAM, and MoCA servicesAllows tech to determine if a reported broadband error is due to the in-home distribution or the actual service delivery to the home by qualifying the coax paths.Innovations with wiring testing also mean that DSAM can now trouble shoot and validate wiring connectivity and quality in a fraction of the time using SmartID advanced coax probes. Smart ID is providing in-home wiring certifying and fault finding capability for installers who need to verify installation quality or readiness for in home service distribution services or to trouble shoot existing cabling.The Smart ID tags are active modules that allow for testing of coax performance and connectivity from point of entry to wall plate or outlet termination, operating in the 5-1,650MHz range. In addition the SmartIDs test and validate in-home wiring, for internal point to point (outlet to outlet) service distribution in order to prove wiring is capable of supporting MoCA servicesMapping wiring connectivity shows if there are any hidden issues like buried cables which are still connected and potentially not terminated correctly. It also allows for any faults to be pin pointed immediately without the need for the traditional segmentation fault finding.DSAM acts as a config and results display unit, all tests are carried out by the Smart ID tags , DSAM connects to a single Smart ID tag via USBPOE = Point of EntryCPE = Customer Premise Equipment
58 We want to …. Verify Frequency Response to and from each outlet So lets sweep forward and reverse from 5 Mhz to 1500MhzCalculate loss from Ground Block to each outletListen for ingress on each legWith some built in intelligence we can map the wiring system too!
59 Sweep Trace – Freq Response Shows POE to outlet frequency response for Forward and Reverse SweepsWhy not do in one sweep?We want good resolution at the reverse band edgesUpstream Freq ResponseDownstream Freq Response – with MoCA filter in place
60 See each path’s frequency response Sweep graphs can identify many issues in the coax networkRelative levels are shown at multiple frequencies to give users more information than numbers alone can expressBy looking at the sweep response users can identify why the test failed the limits of the service plan:Too much overall loss, adjacent points’ difference too great, overall highest loss to lowest loss (peak to valley) too greatUsers can see and interpret from the sweep response signal degradation caused by:Frequency cut offs due to poor splitters or inline filtersAmplifiers eliminating the return or MoCA bandsExcessive attenuationReoccurring standing wavesFrequency suck outs60
61 Seeing how everything is connected Shows what is connectedThe probes should determine how what it sees is connected and where those elements have common connectionsEach element can be shown on the topology map including: splitters, filters, amplifiers, and found mismatchesUsers can easily identify if unexpected elements are discovered and trace where those elements are located before beginning to troubleshoot the coax networkNote: Not every topology can be mapped with 100% accuracy though most common configurations can. Filters and amplifiers in the path can lead to inaccurate common points being shown on the topology map and are highlighted yellow when present.61
63 Whole home results screen… For whole house certification – Keep It SimpleSummary results has all that is needed at a glance:Pyramid screenOverall pass/failPass/fail for each upstream and downstream path from POE to each outletIngress noise limit checkPass/fail for MoCA (if desired) between all devices in the customer premise
64 Now – we have whole house Home Certification ! We can test RF downstream and upstream and DOCSIS at the ground block or point of entry, and then…We can test multiple outlets and know how many were testedOne-Button test for all tested outlets saves timeIdentify what the inside wiring problem isIdentify where the problem isIdentify hidden amps, splitters and filtersTrue “Whole House” Certification.
69 1 Drop – 1 Node – DO NOT NEGLECT DROP INGRESS MITIGATION!! Reverse Spectrum shot at customer's drop
70 Troubleshooting MoCAMoCA emulation is currently not solving service problemsRate Tables between MoCA devices are already available via diagnostic pages on STB’s (CPE)Rate Tables only provide techs with information of whether the MoCA problem still exists or notDoes not provide root cause breakdown or fault identificationTech must guess as to what is causing the MoCA issue by visually tracing the coax, making changes, then retestingLike DOCSIS – MoCA has been revised – Latest is MoCA 2.0 (Released June 2010)All devices today are still on the MoCA 1.1 chipset hardwareNew Hardware will be required to go to MoCA 2.0 – NOT a software upgradeMost Operators will want MoCA 2.0 hardware when available in mass deploymentsCapacity gains ensure future functionality support is easier to deployNo chipsets/hardware currently exists for MoCA 2.0
71 JDSU SmartID™ - Advanced Coax Probes Operator Issues:Supervisors – Concerned when subscribers complain due to issues arising shortly after an installation or the first/second repeat truck rollTechnicians – Much of their time spent troubleshooting coax cable attempting to guess at possible solutionsMoCA – A new technology to the industry, therefore there is fear about the unknown and how to fix issues when they appearJDSU Solution with SmartIDs:Reduce largest cause of service repeat ticketsIncrease Triple-Play and/or Multi-room DVR subscriber satisfaction through reduced repeat callsSpeedup troubleshooting by knowing what to fixQualify the coax is capable of handing all services, present and futureSaves operators money by combining with existing DSAMs and making techs more efficientDifferentiate between Triple-Play or MoCA impairmentsMoCA is so new that many operators have no real experience or in depth knowledge of the technology. This fear has stemmed many questions as to how to validate that it works or test the service.To validate its operations the technician doing the service call currently can look at the diagnostics of the Set Top Box to validate that all devices have been found on the network and from this same screen can see the quality of the service connections (view Rate Table).MoCA, however, is more of an all or nothing type of service. If the devices can talk, the service works 9 times out of 10. If the devices can not talk, all bets are off on what is really going on. We have found that usually MoCA issues are created due to a coax network problem. If the tech can find the cause of the issue they can resolve nearly all MoCA issues. But that is indeed the problem, identifying that problematic element in the coax plant.SmartIDs work by directing the technician to the location that is the cause of not only MoCA services but of also Triple-Play (voice, video, data) services as well.
72 MoCA CPE Diagnostics Information Good for verifying if MoCA rates are acceptable or failingTroubleshooting problems with MoCA equipmentIdentifies which nodes it can not seeCan identify a problem exists (Tiling, Rate issues, MER, BER, etc…)Rate Table does not help identify root cause of problems but identifies which leg problems may existMAC AddressesRate Table
73 Complete in home certification AtticCrawl SpaceSplitterUSB toMini-USBPoint of Entryor Main SplitThis is a chargeable accessory (SmartID) for In-home wiring survey and test in order to allow fault finding of service distribution via technologies such as DOCSIS, QAM, and MoCA servicesAllows tech to determine if a reported broadband error is due to the in-home distribution or the actual service delivery to the home by qualifying the coax paths.Innovations with wiring testing also mean that DSAM can now trouble shoot and validate wiring connectivity and quality in a fraction of the time using SmartID advanced coax probes. Smart ID is providing in-home wiring certifying and fault finding capability for installers who need to verify installation quality or readiness for in home service distribution services or to trouble shoot existing cabling.The Smart ID tags are active modules that allow for testing of coax performance and connectivity from point of entry to wall plate or outlet termination, operating in the 5-1,650MHz range. In addition the SmartIDs test and validate in-home wiring, for internal point to point (outlet to outlet) service distribution in order to prove wiring is capable of supporting MoCA servicesMapping wiring connectivity shows if there are any hidden issues like buried cables which are still connected and potentially not terminated correctly. It also allows for any faults to be pin pointed immediately without the need for the traditional segmentation fault finding.DSAM acts as a config and results display unit, all tests are carried out by the Smart ID tags , DSAM connects to a single Smart ID tag via USBScreen shot on bottom left shows 2 test results:The first column of the pyramid shows results from tag A to all the other tags (R, L, I, F) for the forward and reverse paths in the MHz rangeThe remaining columns show the In-Home distribution result and is all the permutations of connections from every SmartID to every other SmartID in the selected MoCA range. Any 50MHz MoCA channel between 850MHz and 1.525GHz can be selected for testing/qualification (the example above shows the result for a single 50MHz MoCA channel MHz with a center frequency of 1150MHz)
74 Certify each Coax Path Independently Qualification Screen shows Pass/FailIf all metrics pass the coax paths are good for the services its was tested againstIf a failure exists then further action is requiredThe columns on the left indicate which parameters failed for the movable bold box – Different paths may have different resultsAdditional detail about the failure can be collected from the Detail and the Network Overview screens – Accessible by pressing ViewA frequency response graph can be used to help determine why the result was failing the limits set by the testvf The first column of the pyramid shows results from tag A to all the other tags (R, L, I, F) for the forward and reverse paths in the MHz rangeThe remaining columns show the In-Home distribution result and is all the permutations of connections from every SmartID to every other SmartID in the selected MoCA range. Any 50MHz MoCA channel between 850MHz and 1.525GHz can be selected for testing/qualification (the example above shows the result for a single 50MHz MoCA channel MHz with a center frequency of 1150MHz)
75 Seeing how everything is connected Network Overview shows what is connectedThe SmartIDs can determine what it believes is connected and where those elements have common connectionsEach element is shown on the topology map including: splitters, filters, amplifiers, and found mismatchesUsers can easily identify if unexpected elements are discovered and trace where those elements are before beginning to troubleshoot the coax networkNote: Not every topology can be mapped with 100% accuracy though most common configurations can. Filters and amplifiers in the path can lead to inaccurate common points being shown on the topology map and are identified when present.
76 Deeper Dive into the Network Detail view shows additional information about the networkProbe paths are isolated for a deeper view about the tested coax networkIndividual coax segment information is shown – Lengths and element information are indicatedAdditional text is presented to help indicate failed service testsPotential causes of the failures and impedance mismatches are shown on the screen as faults (exclamation points) as well as the distance from other elements to the potential faults are shownElements such as filters, amplifiers, and splitters are also shown with more detail in this view
77 See each path’s frequency response Sweep graphs can identify many issues in the coax networkRelative levels are shown at multiple frequencies to give users more information than words alone can expressBy looking at the sweep response users can identify why the test failed the limits of the service planUsers can see and interpret from the sweep response signal degradation caused by:Frequency cut offs due to poor splitters or inline filtersAmplifiers eliminating the return or MoCA bandsExcessive attenuationReoccurring standing wavesFrequency suck outs
78 Lets have some review of MER… “MER” is to Digital, what signal to noise is for analogMER is affected by high noise, low signalAlso ANY other impairmentsMER readings are relatively immune to “brief bursty” interferenceMER is a predictor of BER40db is the highest you will see.256 QAM needs 29dB or better to work.64 QAM needs 25dB or better to work.Add 3db to above figures to allow headroom.
79 Lets Talk a little BER BER responds to changes a faster than MER BER is ESTIMATEDIts not like BERT testing where data is looped backA 256QAM channel transmits at a symbol rate of 5M symbols per secondBit rate = 8 bits per symbol X 5M symbol per second =40M bits per secondError Incident = Bit rate X BER = Errors Per Second
80 MER and BER Cliff Effect 1.10-11.10-94.10-4223.5404QAM16QAM64QAM256QAMMERBERA small variation in MER (+/- 1 dB) will cause a large variation in BER measurement.Using BER for trouble-shooting and fault location is not repeatable and very inaccurate.
81 Testing multiple outlets in less steps TAPDrop CableeMTA-CABLE MODEMHigh PassFilterGROUNDBLOCK3-WaySplitterHouse2-WayAmplifierThen verify we can deliver that quality from here to each outletTest RF quality, upstream levels, DOCSIS test here