Comtech EF Data DMD-2050E - Manual (Page 105)

DMD2050E Universal Satellite Modem Theory of Operation
MN-DMD2050E Revision 2 3–63
The number of user data slots and control words per frame is selected by the SCC Control Ratio
Parameter. This can be any value from 1 to 1 through 1 to 7. A higher ratio allows a lower
overhead rate but since there are less Sync Words, there is a higher acquisition time.
The following examples show a control ratio of 1 to 3 and 1 to 1. Example 1 shows three Control
Words for every Synchronizing Word, and Example 2 shows one Control Word for every
Synchronizing Word.
Figure 3-22. 1 to 3 Control Ratio
Figure 3-23. 1 to 1 Control Ratio
The Control Ratio of the receiving units must match the Control Ratio of the transmitting unit.