DekTec DTC-300 StreamXpress - Manual (Page 32)

DTC-300-SP – StreamXpress
USER MANUAL
32
Variable Type Description Details Diag
Bandwidth
Selection
Drop
down
Select the bandwidth of the modulated channel #1 1
Modulation
modes
Drop
down
Allow to set the number of active carriers #2 2
Constellation
Mode
Drop
down
Select the Constellation mode used for the modulation #3 3
Guard
interval
Drop
down
Select the guard interval used for the modulation #4 4
Code Rate Drop
down
Select the FEC code rate used for the modulation #5 5
More Check
box
Open a second window with more settings (See section below) #6 6
#1 Bandwidth Selection:
The DVB-H modulation supports multiple bandwidth per channel. With this setting the user can
select between 5,6,7,8 MHz for the RF spectrum per channel.
#2 Modulation modes:
The DVB-H modulation supports 3 modes: 2K, 4K and 8K. These modes represent the approximate
number of active carriers. The exact number of carriers for DVB-H is:
1705 active carrier for 2K mode
3409 active carrier for 4K mode
6817 active carrier for 8K mode
#3 Constellation Modes:
The DVB-H modulation supports multiple sub-modulation modes. Depending on the application and
how error prone the channel is, the user can select different constellation mode. The StreamXpress
supports QPSK, 16-QAM, 64-QAM.
#4 Guard Interval:
3
1
2
4
5
6