Comtech EF Data SDM-300L - Manual (Page 46)

SDM-300L Satellite Modem Operation
Rev. 2 3–5
Press [
↑
] or [
↓
] to change the parameters. After the display represents the correct
parameters, press [ENTER] to execute the change. This action initiates the necessary
programming by the modem.
To undo a parameter change prior to execution, press [CLEAR].
Notes:
1. Figure 3-3 list the front panel menu window selections.
2. ComTech EFdata recommends that selection of the desired Modem Type be made
prior to making any other setting. This procedure is located in the Utility Modem
Type menu.
3. Menus or commands that are specific to certain modem configurations are only
accessible after selecting the appropriate modem configuration. This prevents
incompatible parameters from accidentally being selected.
4. All of the windows are accessible in the Custom mode. Take caution not to select
incompatible parameters, as the modem does not shut out incompatible command
choices in the Custom mode.
3.2.1 Code Rate and Data Rate Range
The following code rates and data rate range apply to the SDM-300L.
Code Rate Data Rate Range
BPSK 1/2
QPSK 1/2
QPSK 3/4
QPSK 7/8
OQPSK 1/2
OQPSK 3/4
OQPSK 7/8
BPSK 1/1
QPSK 1/1 2.4 to 1250 kbit/s
4.8 to 2500 kbit/s
7.2 to 3750 kbit/s
8.4 to 4375 kbit/s
4.8 to 2500 kbit/s
7.2 to 3750 kbit/s
8.4 to 4375 kbit/s
4.8 to 2500 kbit/s
9.6 to 5000 kbit/s
Note: In some applications the practical lower data rate is typically 19.2 kbit/s, or higher,
depending upon the performance of equipment used in conjunction with the SDM-300L.
These applications include the use of a BUC or an LNB.