Dvb Pcr Error
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Switching and Data Acquisition SystemsSemiconductor Test SystemsComponents and AccessoriesSoftwareKEITHLEY PRODUCTSRefurbished Test Equipment ALL Products SERVICES & SUPPORT Calibration ServicesFactory CertifiedMulti-brand CommercialQuality and AccreditationCalWebRepair ServicesCheck Warranty StatusTrack Repair StatusPartsFactory Service PlansProduct Testing Services ALL SERVICES Downloads, Manuals & DatasheetsContact Technical SupportDiscontinued-product SupportSupport ForumOrder StatusFAQ'S SUPPORT CENTER ResourcesProduct RegistrationProduct etr 290 Videos (TekTV)Quality AssuranceSafety RecallProduct Recycling (Europe only)Export CodesIntegrity and Compliance ProgramNewsroomEventsBlogPartner 1-800-833-9200 Search Toggle Search BUY | QUOTE BUY | QUOTE Request a Quote Product Demo Sales Contact Request a catalog Call 1-800-833-9200 Tek Online Store Special offers partner locator GSA PROGRAM Check List Price How & Where To Buy Contact us Login Login Search SEARCH Tektronix What is the definition error 2.4: PCR_accuracy_error? Question: What is the definition error 2.4: PCR_accuracy_error? Answer: The formal definition of this error is given in the TR 101 290: Measurement guidelines for DVB systems document that is published by ETSI. A brief summary of this error is given below. For more information about this error or the test that generates it, please consult ETSI TR 101 290.MPEG transport streams must periodically contain PCR (program clock register) values which are a snapshot of the
Programmable Logic Prototyping SoC Test & Measurement Wireless & Networking Breaking News NEWS & ANALYSIS: NXP Pushes Hardware Isolation in i.MX8 BLOG: Engineers Must Balance IQ and EQ NEWS & ANALYSIS: Software Predicts Power Component Failure NEWS & pcr accuracy ANALYSIS: Toyota: Hydrocar as 'Power Bank' 20 Years out NEWS & ANALYSIS: Google Does Consumer what does pcr measure Electronics SPONSORED: IEEE GLOBECOM'16: Freedom Through Communications, Dec 4-8 Design How-To How To Analyze Digital Video Transport Streams with Tektronix' MTS400 Chris program clock reference Purdy, Tektronix Applications Engineer4/25/2005 10:00 PM EDT Post a comment NO RATINGSLogin to Rate Tweet Abstract: Developing a Compressed Video Test Strategy Digital video broadcasts feature not only millions of bytes of digital data that must http://www.tek.com/support/faqs/what-definition-error-24-pcraccuracyerror be error free, but also multiple video, audio, data and program guide transport streams that must be perfectly in sync. Small errors are commonplace and have the potential to derail a broadcast and cause costly blackouts. To make matters worse, these errors can surface intermittently, making them extremely difficult to identify, understand and solve. A sound test strategy is to first detect an error, prioritize it, judge its importance and then locate http://www.eetimes.com/document.asp?doc_id=1273562 where in the chain the problem exists. Detection and resolution of these problems needs to be simplified to ensure time to insight is kept to an absolute minimum to avoid the end user being impacted. The Challenge: Testing and Verifying Compressed Video Transport Streams Digital video broadcasts feature not only millions of bytes of digital data that must be error free, but also multiple video, audio, data and program guide transport streams that must be perfectly in sync. Small errors are commonplace and have the potential to derail a broadcast and cause costly blackouts. To make matters worse, these errors can surface intermittently, making them extremely difficult to identify, understand and solve. With the added complexity of today's digital video streams, substantial new test engineering issues become critical. These include standards-compliance, which is both assuring that equipment interoperates with that of other vendors, and the video and audio decodes correctly by the consumer's equipment. There is also an entirely new set of problems arising within transport streams carrying new compression systems such as MPEG4/H.264/Windows Media 9 and SMTE VC-1. Partial transport streams and signaling for mobile video standards such as DVB-H also present new test challenges. Figure 1: Typical modern broadcast system See full size image Modern Broadcast Systems Traditionally conducted offline, analyzing and debugging moder
ETSI TR 101 290 (Measurement guidelines for DVB systems). When you start a DVB-C test or monitoring, the Test Agents will tune to the frequency of the selected channels, then start monitoring them continuously. By http://support.netrounds.com/hc/en-us/articles/201976986-DVB-C-MPEG using the DVB-C testing feature, you will quickly get a view of DVB-C channel quality at the points where you have connected the Test Agents. Using multiple Test Agents lets you monitor quality in different parts of your network. Netrounds will measure and highlight MPEG loss, PCR jitter, rate, and any general problems with the stream. Note that Netrounds does not decrypt any of the MPEG streams; its quality measurements are what is based on the unencrypted MPEG headers only. Setting up a test or monitoring First decide upon your network topology, then follow the steps below. To run DVB-C/MPEG measurements you need to have at least one Netrounds Test Agent installed. If you haven't already done the installation, consult our quick start guides for various types of Test Agents in the section Netrounds Probes and Agents. To be able to monitor DVB-C channels, the Test Agent must dvb pcr error be equipped with a special DVB-C USB device (dongle). Install this dongle if you haven't already. Also make sure that you have prepared Netrounds with your DVB-C channel list. Then create a new DVB-C MPEG test or monitoring and fill in the mandatory parameters below: Parameters Tests only Duration (seconds): The duration of this test step in seconds. Min: 0 s. Max: 604800 s. Default: 60 s. Fail threshold (seconds): The number of errored seconds (ES) that will trigger a fail for this test. Default: 0. Wait for ready: Time to wait before starting the test. The purpose of inserting a wait is to allow all Test Agents time to come online and acquire good time sync. Min: 1 min. Max: 24 hours. Default: "Don't wait", i.e. zero wait time. General Receivers: Specify the DVB-C USB dongles you want to use in the test or monitoring. The devices are identified as "probe_name:dongle_serial_number". Channels: Select the DVB-C channels that should be monitored from the preset channel list. Only those channels that have the same frequency, symbol rate, FEC and modulation can be selected at a time. Thresholds for errored seconds (ES) MPEG loss: Maximum tolerated MPEG packet loss (CC errors) per second. Default: 2 packet