TSMIP-10GE Series
IP Transport Stream Monitor
Revision 1.0
Page-27
PAT Error:
The Program Association Table (PAT), which only appears in PID 0×0000 packets, tells the
decoder what programs are in the TS and points to the Program Map Table (PMT) which in turn point to
the component video, audio and data streams that make up the program. If the PAT is missing then the
decoder can do nothing, no program is decidable. Nothing other than a PAT should be contained in a PID
0×0000.
Continuity Count:
For this indicator three checks are combined. The preconditions “Incorrect packet
order” and “Lost packet” could cause problems for receivers that are not equipped with additional buffer
storage and intelligence. It is not necessary for the test equipment to distinguish between these two
preconditions as they are logically OR-ed, together with the third precondition, “a packet occurs more than
twice” into one indicator.
PMT Error:
The Program Association Table (PAT) tells the decoder how many programs there are in the
stream and points to the PMTs that contain the information where the elementary streams for any given
event program can be found. Elementary streams in this context are the video stream (normally one) and
the audio streams and the data streams (e.g.Teletext). Without a PMT the corresponding program is not
decidable.
PID Error:
It is checked whether there exists a data stream for each PID that occur. This error often
occurs where TS are multiplexed, or demultiplexed and again remultiplexed.
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:
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 Error:
The accuracy of ±500 ns is intended to be sufficient for the color sub carrier to be synthesized
from the system clock. This test should only be performed on a constant bitrate TS as defined in ISO/IEC
13811-1.
PTS Error:
Presentation Time Stamp Error is the reception of a time reference value for presentation of
media that is beyond a time limit (over 700 msec for MPEG).
CAT Error:
The CAT is the pointer to enable the receiver to find the EMMs associated with the CA
system(s) that is used. If the CAT is not present, the receiver is not able to receive management
messages.
