Tektronix MTG100 - Manual (Page 48)

Operating Basics
MTG100 & MTG300 MPEG Generator User Manual
2Ć15
Figure 2Ć12: PopĆup message box
Output Loop Modes
The MPEG generator continuously outputs a transport stream using one of three
user-selected looping methods: No Update, Auto Update, or Stress (MTG300
only). You can set the output loop mode using the Configure pull-down menu.
NOTE. For the transport stream packet with the transport_scrambling_control
value of 0, the PTS and DTS values are not updated even if the output loop mode
is set to Auto Update or Stress. When you playout the transport stream
scrambled by a decoder, be sure to use the No Update loop mode.
When the TDT/TOT/STT Update command from the Configure pull-down menu
is set to OFF, the timing values of the TDT/TOT/STT are not updated even if the
output loop mode is set to Auto Update or Stress. In this case, the elapsed time
of the current transport stream data output is displayed in the Elapsed Time or
TDT/TOT/STT Time Display box.
When the TOT is not held in one transport stream packet, the CRC (Cyclic
redundancy Check) value in the table is not updated.
When the PTS/DTS information is not held in one transport stream packet with
the payload_unit_start_indicator value of 1, they are not updated correctly.
For the file downloaded in M-TMCC or Non TS format, you cannot select the
loop modes other than No Update. In addition, for the file downloaded in
S-TMCC format, you cannot select the Stress loop mode.
In the No Update loop mode, the MPEG generator outputs the stream with no
changes allowed (except setting the start packet and stop packet of the transport
stream). Time information values are not updated. You cannot make any changes
to the transport stream items and the Bezel menu functions are disabled except
for the TS Item menu where you set the start and stop packets for the transport
stream.
No Update Mode
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