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CDM-570/570L Satellite Modem with Optional IP Module Revision 6Table of ContentsMN/CDM570L.IOMCHAPTER 7.FORWARD ERROR CORRECTION OPTIONS..........................................................7–17.1 Introduction .................................................................................................................................7–17.2 Viterbi4 .........................................................................................................................................7–27.3 Reed-Solomon Outer Codec (Hardware Option)......................................................................7–27.4 Trellis Coding (requires 8-PSK/8-QAM FAST Option) .............................................................7–47.5 Turbo Product Codec (Hardware Option).................................................................................7–57.5.1 Introduction............................................................................................................................7–57.5.2 TPC modes available in the CDM-570/570L.........................................................................7–57.5.3 8-QAM Modulation ................................................................................................................7–67.5.4 End-to-End Processing Delay...............................................................................................7–67.5.5 Comparison of all TPC Modes ..............................................................................................7–77.6 Uncoded Operation (No FEC) ....................................................................................................7–87.7 Rates above 2.5 Msymbols/sec .................................................................................................7–9CHAPTER 8. OFFSET QPSK OPERATION ......................................................................................8–1CHAPTER 9.CLOCKING MODES.....................................................................................................9–19.1 Transmit Clocking.......................................................................................................................9–19.1.1 Internal Clock ........................................................................................................................9–19.1.2 Tx Terrestrial .........................................................................................................................9–29.1.3 Rx Loop-Timed, Rx=Tx .........................................................................................................9–29.1.4 Rx Loop-Timed, RxTx (Asymmetric Loop Timing)............................................................9–29.2 Receive Clocking ........................................................................................................................9–39.2.1 Buffer Disabled (Rx Satellite) ................................................................................................9–39.2.2 Buffer Enabled, Tx=Rx..........................................................................................................9–39.2.3 Buffer Enabled, RxTx........................................................................................................9–39.3 X.21 Notes....................................................................................................................................9–39.4 G.703 Clock Extension ...............................................................................................................9–69.4.1 Clock Extension Mode 1 .......................................................................................................9–69.4.2 Clock Extension Mode 2 .......................................................................................................9–79.4.3 Clock Extension Mode 3 .......................................................................................................9–7CHAPTER 10. EDMAC CHANNEL ..................................................................................................10–110.1 Theory Of Operation .................................................................................................................10–110.2 M&C Connection .......................................................................................................................10–210.3 Setup Summary.........................................................................................................................10–3CHAPTER 11. AUTOMATIC UPLINK POWER CONTROL ...........................................................11–1vii