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CDM-600L Satellite Modem
Front Panel Operation
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 R-S selection to the Differential Encoding selection, as
shown below:
DECODER= NONE(NONE,VIT,SEQ,TCM,TPC,LDPC)
DIFF-DECODER= OFF (ON,OFF)
IMPORTANT
CONFIG: RX: DECODER: REED-SOLOMON
REED-SOLOMON DECODING = ON(200/180)
Use the [↑] [↓] arrow keys to select one of the listed parameters, and press ENTER.
Selections depend on the Framing mode. Possible selections include:
•
•
•
•
•
•
•
CONFIG: RX: DEMODULATION
DEMODULATION=QPSK(B,Q,OQ,8-PSK,16QAM)
FEC RATE = 1/2
Select one of the parameters using the [←] [→] arrow keys, and then edit using the [↑] [↓]
arrow keys. Edit the Modulation type and the FEC rate.
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.
IESS-310 (219/201), open or closed network
IBS (126/112), open or closed network
EDMAC (200/180), closed network
IDR (225/205), open network
IDR (194/178), open network
UNFRAMED (220/200), closed network
LEGACY COMTECH EF DATA (225,205, with V.35 scrambling), closed network
(1/2,3/4,7/8)
6–15
Revision 2
MN/CDM600L.IOM
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