Comtech EF Data SDM-300A - Manual (Page 107)

SDM-300A Satellite Modem Revision 6
Front Panel Operation MN/SDM300A.IOM
5–13
FUNCTION SELECT: CONFIGURATION: MODULATOR:
MODEM REFERENCE
MODEM REFERENCE
INTERNAL
Select one of the following:
INTERNAL
EXT 1 MHz
(see Note)
EXT 5MHZ (see Note)
EXT 10MHZ (see Note)
EXT 20 MHZ (see Note)
OUPUT 10 MHz (High Stability Option only)
Note: If any EXT REF is selected for the modem reference and there is no input to CP3, the
modem will detect an alarm and automatically switch to the internal clock.
Upon entry, the INTERNAL mode is displayed. Press [
↑] or [↓] to make the selection. Press
[ENTER] to execute the change.
FUNCTION SELECT: CONFIGURATION: MODULATOR:
RS ENCODER (CONDITIONAL)
RS ENCODER
OFF
IMPORTANT
Conditional: Reed-Solomon option only.
Programming the Reed-Solomon Encoder automatically turns off the RF transmitter
(because of symbol rate changes). If none of the proper overhead types and data rates
apply, the Reed-Solomon encoder program in the on state will be rejected (double beep).
Programs the Reed-Solomon Encoder: On or Off. Upon entry, the current status of the Reed-Solomon
encoder is displayed. Press [
↑] or [↓] to make the selection. Press [ENTER] to execute the change.