Comtech EF Data SDM-650B - Manual (Page 111)

SDM-650B Satellite Modem Operation
Rev. 5 4–9
4.1.4 Menu Explanations
Modem configuration may be viewed or changed by entering the Config level from the
Select menu on the front panel.
4.1.4.1 Select Configuration
Refer to Table 4-2.
Once the Config menu is entered, the configuration status of all parameters can be viewed
by using
[ ← ] and [ → ] . To change a configuration parameter, press [ENTER] to begin the
change process. Then, use the arrow keys to make the changes.
After the changes are made and the display represents the correct parameters, execute the
change by pressing [ENTER]. When [ENTER] is pressed, the necessary programming is
initiated by the modem. [CLEAR] allows the user nullify a change prior to execution.
The following table describes each configuration function in detail.
Configuration Description
TX-x Code Rate Transmitter rate selection. Select one of four pre-defined transmitter
coder/data rate combinations (A, B, C, or D), or a variable rate selection
(V).
On entry, the current transmitter rate is displayed with the flashing
cursor on the first character of the code rate on line 1, and the data rate
on line 2. Use the arrow keys to select one of four pre-defined rates.
Filters that are not present may display as N/A (not assigned) and
cannot be programmed. If the modem is equipped with the variable rate
option, TXV can also be selected and the desired data rate can be
entered. The BPSK TX code rate operation will be selectable from this
window. If one of the pre-defined filters are BPSK, the selection will
show up in the appropriate TX filter. If the modem has the variable rate
option, the variable rate filter may be entered and BP12 selected. Enter
the desired data rate.
RX-x Code Rate Receiver rate selection. Select one of four pre-defined receiver
decoder/data rate combinations (A, B, C, or D), or a variable rate
selection (V).
On entry, the current receiver rate is displayed with the flashing cursor
on the first character of the code rate on line 1, and the data rate on line
2. Use the arrow keys to select one of four pre-defined rates. Filters that
are not present may display as N/A (not assigned), and cannot be
programmed. If the modem is equipped with the variable rate option,
TXV can also be selected and the desired data rated entered. The
BPSK RX code rate operation will be selectable from this window. If one
of the pre-defined filters are BPSK, the selection will show up in the
appropriate RX filter. If the modem has the variable rate option, the
variable rate filter may be entered and BP12 selected. Enter the desired
data rate.