TSMIP-10GE Series
IP Transport Stream Monitor
Page-26
Revision 1.0
4.3.5. TS Syntax Errors- P1&P2
This tab displays a general health check of the most important elements of the TS. The tests are not
exhaustive and are outlined in detail in the document Digital Video Broadcasting (DVB), measurement
guideline for DVB systems ETSI TR 101 290. It should be noted that the P3 errors are context sensitive to
the type of input stream selected (under Input Configuration).
Figure 4-18 : VistaLINK
®
PRO Input Configuration- TS syntax Errors- P1&P2
For each test, there is a Fault Monitor check box (1) and a Trigger Fault (2). Selecting the check box 1 will
update the Input Configuration Tab Syntax Error status. The highest alarm severity will prevail when
selecting the checkbox 1 from the drop down menu, be sure to select, the severity that is associated with
this alarm. Selecting the check box 2 will enable the relevant SNMP trap to be triggered and send to
VLPro.
P1 necessary for Decoding
TS Sync Error:
The most important function for the evaluation of the data from the MPEG-2 TS is the
sync acquisition. The actual synchronization of the TS depends on the number of correct sync bytes
necessary for the device to synchronize, two or more consecutive corrupted sync bytes indicate sync loss.
After synchronization has been achieved the evaluation of the other parameters is carried out.
Sync Byte:
The indicator “Sync_byte_error” is set as soon as the correct sync byte (0×47) does not
appear after 188 or 204 bytes. This is fundamental because this structure is user throughout the channel
encoder and decoder chains for synchronization. It is also important that every sync byte is checked for
correctness since encoders do not necessarily check the sync byte.
