Premier Mounts CDM-600 specifications Config RX Decoder, TPC Turbo Hardware option

CDM-600 Satellite Modem	Revision 7
Front Panel Operation	MN/CDM600.IOM

CONFIG: RX: DECODER

DECODER = VIT NONE,VIT,SEQ,TCM,TPC,LDPC)

REED-SOLOMON = OFF (ON,OFF)

Select the parameter to edit using the [←] [→] arrow keys.

The Decoder options are shown in the parentheses. Select using the [↑] [↓] arrow keys, then press ENTER. The choices are:

•Viterbi

•Sequential

•Trellis Coded Modulation - 8-PSK Rate 2/3 only (FAST option)

•TPC (Turbo) (Hardware option)

•None (uncoded)

•LDPC (Hardware option) Note: This option of decoding is only displayed if the TPC/LDPC Codec is installed.

Select ON or OFF for Reed-Solomon using the [↑] [↓] arrow keys, then press ENTER. If Reed-Solomon is ON, proceed to the next menu.

If NONE is selected, the bottom line of the display will change from the RS selection to the Differential Encoding selection, as shown below:

DECODER = NONE (NONE,VIT,SEQ,TCM,TPC,LDPC)

DIFF-DECODER= OFF (ON,OFF)

IMPORTANT

If the user selects Differential Decoding = OFF, there is no way for the modem to resolve the phase ambiguities associated with PSK modulations. For BPSK there is a 1 in 2 chance that the polarity of the data will be correct. In QPSK there is a 1 in 4 chance that the data will be correct.

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