(Config: Tx) Mod Frame (Dvb-S2 Mode Only); (Config: Tx) Code; (Config : Tx) Symrate; Frame (Dvb-S2 Mode Only) - Comtech EF Data CDM-710 Installation And Operation Manual

CDM-710 Broadcast Satellite Modem
Front Panel Operation
(CONFIG: Tx) Mod
Tx Frame Size:
Long
Select Long or Short using the
Long. When Long is selected, the standard FECFRAME = 64,800 bits is enabled. If Short is
selected, the FECFRAME = 16,200 bits is enabled.
Note: Only DVB-S2 allows a FECRAME choice.

(CONFIG: Tx) Code

Tx CodeRate: 1/2 3/5 2/3
3/4 4/5 5/6 7/8 8/9 9/10
Refer to the Data Rate menu for valid code rates.
•
•
IMPORTANT
Use the arrow keys to select the code rate, then press

(CONFIG : Tx) SymRate

Data: 038.723635 Mbps
Sym: 017.379483 Msps(E)
Use the arrow keys to select the desired digit of the Symbol Rate, then use the
keys to change the value of that digit. Press
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 modulation, code rate and other parameters are changed the modem attempts to maintain
the same Symbol Rate, provided it is still in range when one of the other parameters is changed.
The valid range of Symbol Rate and Data Rate Range for DVB-S2, DVB-S and DVB-DSNG are
shown in the following table. When programming a new data or symbol rate the modulator will
not accept it unless it is in the range, and it will turn off the Tx Carrier. If a new rate is not
accepted, change the Modulator Code Rate or Mode. There is some round off in the data rate
ranges in the last digit. The first table is for the standard FECFrame and the second table is for the
short frame.
The tables are based on a 188 byte frame format. When a 204 byte format is selected the data rate
increases by 204/188.

Frame (DVB-S2 mode only)

Short
All possible choices are presented at all times.
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 ◄ ► arrow keys will
force the cursor to skip past the unavailable choice.
( E)
arrow keys, then press
ENTER
when done.
ENTER
5–14
Revision 11
MN/CDM710.IOM
. The default value is
ENTER
.
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