Actual Overhead Rate Calculation - Comtech EF Data DMD-2050E Installation And Operation Manual

DMD2050E Universal Satellite Modem
3.19.4

Actual Overhead Rate Calculation

The following is the actual calculation the modem does to calculate the overhead ratio:
1. The modem calculates the minimum in-band rate to limit the size of the user data slots to
2,500 bits (the result is truncated to an integer).
Minimum In-Band = (User Data Rate * Control Ratio)/((Control Ratio + 1) * 250)
2. Using the bigger of Minimum In-Band or the selected In-Band, the modem calculates the
number of bits for each user data slot (result is truncated to an integer).
Slot Bits = (User Data Rate * (Control Ratio * 10))/(In-band Rate * (Control Ratio + 1))
The actual ratio the modem uses is:
Actual Ratio = (Slot Bits + 10)/Slot Bits
Example 1:
User Data Rate: 1,024,000 bps
In-Band Rate: 19,200 bps
Control Ratio:
Minimum In-Band = (1,024,000 * 7)/((7 + 1) * 250) = 3,584
Slot Bits = (1,024,000 * (7 * 10))/(19,200 * (7 + 1)) = 466
Actual Ratio = (466 + 10)/466 = 1.021
Example 2:
User Data Rate: 6,312,000 bps
In-Band Rate: 19,200 bps
Control Ratio:
Minimum In-Band = (6,312,000 * 7)/((7 + 1) * 250) = 22,092 (
Slot Bits = (6,312,000 * (7 * 10))/(22,092 * (7 + 1)) = 2,500
Actual Ratio = (2,500+ 10)/2,500= 1.004
MN-DMD2050E Revision 2
1 to 7
1 to 7
Theory of Operation
(less than In-Band Rate)
more than In-Band Rate)
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