Comtech EF Data DM240XR - Manual (Page 134)

DM240XR High-Speed Digital Modulator Remote Operations
MN-DM240XR– Revision 13 9–20
When changing Data Rate, Symbol Rate, Inner FEC Rate, Modulation Type,
or Terrestrial Framing using the Mod All Command, the Data Rate and
Symbol Rate parameter must be range checked using the following formulas
to ensure they do not exceed the max limits:
Symbol Rate = (Data Rate * Overhead)/(Code Rate * Modulation)
Data Rate = (Symbol Rate * Code Rate * Modulation)/Overhead
Maximum Symbol Rate
68 Msps.
Maximum Data Rate
238 Mbps with high-speed interface card.
Overhead
204/188 for 188 byte
204/204 for 204 byte
204/187 for none
Modulation
QPSK = 2, 16QAM = 4, BPSK = 1, 8PSK = 3
Code Rate
1/4, 1/3, 2/5, 3/5, 1/2, 2/3, 3/4, 5/6, 6/7, 7/8, 8/9, 9/10