Comtech EF Data CDM-710 Installation And Operation Manual page 123

CDM-710/L Broadcast Satellite Modem
Front Panel Operation
(Config:) Tx:  Mod  Frame (DVB-S2 Mode only)
Use the   arrow keys to select Long or Short. Press ENTER. Note that:
• With Long, the unit enables the standard FECFRAME = 64,800 bits. The
default value is Long.
• With Short, the unit enables the 16,200 bit FECFRAME.
• Only DVB-S2 allowesd a FECFRAME choice.
(Config:) Tx:  Code
This menu displays all possible code rates. If an option is not installed
(either Hardware or FAST) or is not valid, or if a code rate is not available
for the Mode selected, the cursor will skip past the unavailable choice.
(Config:) Tx:  SymRate
Use the   arrow keys to select the desired digit of the Symbol Rate, and then
use the  arrow keys to change the value of that digit. Press ENTER.
The Data Rate digits also change as the Symbol Rate values are edited. The value
of the Data Rate depends upon the code rate, modulation type, and the Mode
type selected.
When you change the modulation, code rate and other parameters, the modem
attempts to maintain the same Symbol Rate, provided it is still in range when
you change one of the other parameters.
The valid range of Symbol Rate and Data Rate Range for DVB-S2, DVB-S and
DVB-DSNG are shown in Table 7-1 and Table 7-2. When programming a new data
Tx Frame Size:
Long Short
Tx CodeRate: 1/2 3/5 2/3
3/4 4/5 5/6 7/8 8/9 9/10
Data: 038.723635 Mbps
Sym: 017.379483 Msps
7–17
MN/CDM710.IOM
Revision 12
(E)
(E)