
Theory of Operation DMDVB20 LBST Satellite Modem
3-10 TM138 – Rev. 1.0
3.5 Clocking Options
The modem supports a number of different clocking options that can be recovered from
the satellite or the terrestrial links. The various clocking options allow users to determine
which clock will best fit their applications. Figure 3-6 gives an overview on how the
modem processes the various clocks for the Tx Clock source and the Rx Buffer Clock
source. Tx and Rx Clocks may be independently locked.
Figure 3-6. Clocking and Polarity Diagram
3.5.1 TX Clock Options
TX clock options can be recovered from the terrestrial interface, satellite interface or internally
generated. The allows users to select SCTE Clock (Terrestrial) or the SCT internal clock. The
modem also allows user to recover the SCT Clock from the satellite (SCR) or from the modem
internally. The modem allows users to select clock polarity. The Tx clock selections available
are:
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