DekTec DTC-300 StreamXpress User Manual
Page 43
DTC-300-SP – StreamXpress
USER MANUAL
43
#6 Time IL length:
This is a 8-bit field determined by the values set within the Time Il Type field
-If the Time Il Type is set to the value '1', this field shall indicate the number of T2-frames to which
each Interleaving Frame is mapped.
-If the Time Il Type is set to the value '0', this field shall indicate the number of TI blocks per
Interleaving Frame.
#7 ID:
This 8-bit field identifies uniquely a PLP within the T2 system.
#8 Group ID:
This 8-bit field identifies with which PLP group within the T2 system the current PLP is associated. This
can be used by a receiver to link the data PLP to its associated common PLP, which will have the
same PLP Group ID.
#9 ISSY:
Data processing in the DVB-T2 modulator may produce variable transmission delay on the user
information. The ISSY (Input Stream Synchronizer) subsystem provides suitable means to guarantee
Constant-Bit-Rate (CBR) and constant end-to-end transmission delay for any input data format.
#10 HEM (High-Efficiency Mode):
If checked, the PLP uses High-Efficiency Mode. If uncheck it uses the normal mode.
#11 Rotated Constellation:
The use of the constellation rotation allows improvements in the power transmission requirements,
achieving the required BER values with low values of SNR.
3.5.10.3 Frame structure
This section mostly reports the impact of the PLP and general parameters settings on the modulation.
Variable
Type
Description
Details Diag
# Frames per
super frame
Field
Select the number of T2 frames into super frames
#1
1
Frame size
Display
Field
Displays the number of cells per frames
#2
2