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DM240-DVB High-Speed Digital Modulator
Interface Type
RS-422 Serial
G.703 (E3, T3, STS-1)
HSSI
OC3
STM-1
ASI, AASI
M2P Parallel
DVB Parallel
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
Maximum Data Rate
Overhead
Modulation
Code Rate
TM083 – Rev. 3.0
DM240 Clock Source Selection Matrix
InClk Source
SCT or SCTE
SCTE Only
SCT or SCTE
SCTE Only
SCTE Only
SCTE Only
SCT or SCTE
SCTE Only
68 Msps.
238 Mbps with high-speed interface card.
204/188 for 188 byte
204/204 for 204 byte
204/187 for none
QPSK = 2, 16QAM = 4, BPSK = 1, 8PSK = 3
1/4, 1/3, 2/5, 3/5, 1/2, 2/3, 3/4, 5/6, 6/7, 7/8, 8/9, 9/10
Appendix A
OutClk Source
SCT Only
SCT, SCTE, or None
SCT Only
None
None
None
SCT Only
SCT Only
A
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