Measurement Functions
MTD200 MPEG Test Decoder User Manual
2–11
Transport_error (2nd priority)
The second byte of every packet header in the transport stream contains the
transport_error_indicator, which is a flag that serves to indicate bit errors in the
following packet. This flag is generated and inserted by the Viterbi or Reed-Sol-
omon decoder at the receiver end if the decoder is no longer capable of correct-
ing all bit and byte errors in the transport stream.
Because it is not possible in case of a set transport_error_indicator to predict
which bit or byte contains an error, this packet must not be evaluated by an
MPEG-2 decoder. For this reason, the MPEG test decoder only indicates the
Transport_Error, which means that the packet is not checked for further transport
stream errors.
In the DVB Measurement Guidelines (ETR 290) the preconditions for a
Transport_Error message are set as follows:
Transport ERROR is signaled if
a transport_error_indicator bit is set in the packet header
An error of this type (cumulative message) is indicated by the LED labeled
TRANS lighting (line of LEDs at the front panel). As additional information, the
PID of the packet containing the error can be obtained from the monitoring
report.
NOTE
. The PID information contained in the monitoring report may be wrong if
a transport error is indicated and if the bit error concerns the PID information
of the packet header.
Summary of Contents for MTD200
Page 1: ...User Manual MTD200 MPEG Test Decoder 070 9951 00...
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Page 29: ...Introduction to Digital TV Transmission Technique 1 14 MTD200 MPEG Test Decoder User Manual...
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Page 167: ...Remote Control 5 70 MTD200 MPEG Test Decoder User Manual...
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Page 174: ...Maintenance and Checking 6 6 MTD200 MPEG Test Decoder User Manual...
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Page 204: ...Glossary Glossary 10 MTD200 MPEG Test Decoder User Manual...
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Page 209: ...Index Index 4 MTD200 MPEG Test Decoder User Manual...
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