evertz 7881TSM-IP, Руководство пользователя

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7881TSM-IP
User Manual
Version 1.0
Page - 39
7.5.2. P2 RECOMMENDED
•
Transport_error:
The primary Transport_error indicator is Boolean which counts the erroneous TS
packets. This counter is intended for statistical evaluation of the errors. If an error occurs, no further
error indication should be derived from the erroneous packet.
• CRC_error: The CRC check for the CAT, PAT, PMT, NIT, EIT, BAT, SDT and TOT indicates whether
the content of the corresponding table is corrupted. In this case no further error indication should be
derived from the content of the corresponding table.
•
PCR_repetition_error: The PCRs are used to re-generate the local 27 MHz system clock. If the PCR
do not arrive with sufficient regularity then this clock may jitter or drift. The receiver/decoder may even
go out of lock. This error indicates that the time interval between two consecutive PCR values is more
than 40 ms.
•
PCR_accuracy_error:
The accuracy of ±500 ns is intended to be sufficient for the colour subcarrier to
be synthesized from the system clock. This test should only be performed on a constant bitrate TS as
defined in ISO/IEC 13818-1.
•
PTS_error: The Presentation Time Stamps (PTS) should occur at least every 700 ms. The PTS is only
accessible if the TS is not scrambled.
•
CAT_error: The CAT is the pointer to enable the receiver to find the EMMs associated with the CA
system(s) that it uses. If the CAT is not present, the receiver is not able to receive management
messages.