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User Interfaces DMD15/DMD15L IBS/IDR Satellite Modem
4-36 TM051 – Rev. 5.8
modified. Attempts to select a different buffer clock will result in the error message INVALID
BUFFER CLOCK and the selection will not be allowed.
When the Insert Terrestrial Frame Source selection is set to Internal, the operator needs to
specify how data should be clocked out of the Doppler Buffer. In this case, the operator will be
able to select SCTE, SCT, RX SAT, or EXT EXC as the source for the Buffer Clock. Therefore,
the Insert Terrestrial Frame Source selection should be made prior to attempting to change the
Buffer Clock. In most instances, the Insert Terrestrial Frame Source selection will be set to
External and the Buffer Clock will automatically be set to External.
4.6.4 D&I Sample Configurations and D&I Clock Setup Options
The following are several examples of how to configure the modem for D&I. Also, refer to Figures
3-14 through 3-17 for the D&I Clocking Setup Options Available.
Example 1: Drop 512 Kbps from a T1 trunk, 3/4 rate Viterbi
Insert 512 Kbps into a T1 trunk, 3/4 rate Viterbi
Drop 512 Kbps from a T1 trunk, 3/4 rate Viterbi
Under Modulator:
Under Mod Data:
Set Data Rate = 512000
Set Conv Enc = VIT 3/4
Under Modulator:
Set Mode = Drop & Insert