Discontinued Product
R&S®DVMD MPEG2 Measurement Decoder
Analyzer for MPEG2 transport stream
Analyzer
The analyzer functions of DVMD comprise a protocol analysis of the measured MPEG2 transport stream in realtime.
In DVB mode all measurements are in compliance with the measurement guidelines for DVB systems (ETR 290). They were initially issued by the European DVB project, which is now being used in all parts of the world as the standard for digital TV transmission via satellite, cable or terrestrial. The measurement guidelines ETR290 define possible error conditions in terms of three different priorities.
For the north American ATSC standard, which is used for transmission via cable or terrestrial, there are not specific measurement guidelines existing. The realtime checks DVMD is performing in ATSC mode are therefore extensively according ETR290, where the different ATSC specific system and program information tables (PSIP) are concerned.
Any error occurring is directly indicated by front-panel LEDs. DVMD also detects sporadic errors. Moreover it provides error statistics showing how often a particular type of error has occurred within a specified time interval. A list (REPORT; see lower figure) giving detailed information on the errors occurred including date and time can be obtained. The list contains up to 1000 entries and may be edited to cover exclusively a single type of error.
An integrated monitoring facility allows upper/lower limit checking of the data rates of the null packets. This assures identifying a program or other service being lost from the mutliplex.
If there is an error, the trigger/capture facilities of DVMD can be used to freeze part of the transport stream affected by the error (approx. 2 Mbit) and output it via the RS232 interface in order to analyze it down to bit level.
In addition to in-depth analysis, the optional Stream Explorer™ DVMD-B1 software allows further online masurements with graphic display on the screen (eg data rates, PCR jitter, etc).
Error statistics in DVB mode
Error report with detailed information on causes of errors
