R&S^®DVMD-B1 Stream Explorer

Five operating modes

• DUMP

for comprehensive analysis of transport stream contents

• TRIGGER ON ERROR

for detailed investigation of errors in transport streams

• MEASURE

for graphic display of transport stream parameters in realtime

• MONITORING

for transport stream monitoring and data rate measurement with graphic display in realtime

• OFFLINE

for saving and subsequent restoring of any measurement scenarios (can be used with all four operating modes described above)

DUMP

This operating mode allows detailed analysis of the contents of transport streams (TS). The packet header and service table contents is represented by Stream Explorer™ in hexadecimal format as well as in an interpreted form according to DVB/ ATSC and MPEG2. This makes it very easy for the user to recognize any irregularities in the transport stream.

Clear presentation of transport stream and table structures with Tree Navigator and Table Interpreter (ATSC mode shown here)

TRIGGER ON ERROR

Stream Explorer™ makes use of the TRIGGER-ON-ERROR function supported by DVMD. If an error occurs in the transport stream applied to DVMD, the data in the region of the error are stored in the DVMD and made available to the Stream Explorer™ for evaluation. The cause of the error can thus be reliably detected and displayed in detail.

The following trigger events can be selected:

• all monitored real time errors, which can be assigned to a transport
• any choice and combination of specific real time errors
• occurrence of a predefined PID

TRIGGER EVENT: This display mode is available in addition for error investigation. It shows the structure elements in which the error occurred. Faulty data are shown in red. The type of error is also explained.

MEASURE

This operating mode provides realtime analysis of several transport stream parameters and graphic display in the form of bargraphs or traces:

• PCR jitter (see below)
• Distance of PCR values in transport stream (see below)
• PTS/PCR delay
• Distance of elementary-stream-related PTS values
• Repetition of PSI/SI respectively PSI/PSIP tables (see below)



Realtime measurement of PCR jitter and PCR distance



Realtime measurement of repetition rates of all tables

MONITORING

This is the remote-controlled version of the standard operating mode of the DVMD itself. All monitoring details can be set and displayed via the user interface of the Stream Explorer™. Just as with the DVMD itself, all errors to ETR290 or any choice thereof can be displayed in the report.

Moreover, the report can continuously be stored on hard disk. In contrast to the internal report, the number of entries is not limited in this case. It is thus ensured that even over a longer period of observation no error will go unnoticed. The error report is output in *.csv format, which is extremely convenient for further processing using other software applications for word processing and table calculation.

Additionally available is the realtime graphic display of the data rates of all SI/PSI and/or PSI/PSIP tables, of all individual elementary streams as well as sum values for programs in the form of bargraphs.

OFFLINE

On switching from any operat-ing mode to the offline mode, the current measurement scenario, the operating mode itself as well as all transport stream packets involved will be saved on hard disk. The online analysis can fully be restored in the offline mode by reloading it. In this way measured values can very easily be recorded by simply storing them.