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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 RS selection to
the Differential Encoding selection, as shown below:
ENCODER = NONE (NONE,VIT,SEQ,TCM,TURBO)
DIFF-ENCODER= OFF (ON,OFF)
IMPORTANT
CONFIG: TX: ENCODER: REED-SOLOMON ON
REED-SOLOMON ENCODING = 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: TX: MODULATION
MODULATION = 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 Encoding = 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)
6–11
Revision 0
MN/CDM600L.IOM
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