CDM-625 Advanced Satellite Modem
Revision 1
Front Panel Operation
MN-0000036 (Ref MN/CDM625.IOM)
If
None
is selected, the bottom line of the display changes from the Reed-Solomon selection to a
Differential Encoding selection, as shown:
Decoder=None (None,Vit,TCM,TPC,LDPC)
Diff-Decoder=On (Off,On)
(
34v
)
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.
Select
On
or
Off
for Reed-Solomon using the
▲
▼
arrow keys, then press
ENTER
. When
selecting
Reed-Solomon On
, proceed to the next menu.
CONFIG: Rx
Æ
FEC
Æ
Reed-Solomon On
Reed-Solomon Decoding =IESS-310(219/201)
(Standrd(126/110),IESS-310(219/201)) (
v
)
Use the
▲
▼
arrow keys to select one of the listed parameters, then press
ENTER
. Possible
selections, depending on the Framing mode, are as follows:
•
IESS-310, open or closed network
219/201
•
IBS, open or closed network
126/112
•
EDMAC or EDMAC2, closed network
200/180
•
IDR, open network
225/205, 219/201 or 194/178
•
ESC++ or D&I++, closed network
126/112
•
Unframed closed network
Comtech
standard
220/200
Legacy EF Data
225/205, with V.35 scrambling
5.4.4.4
CONFIG: Rx
Æ
Demod (Demodulation)
Demodulation=QPSK (B,Q,OQ,8PSK,16QAM)
FEC Rate=1/2 (1/2,3/4,7/8)
(
34v
)
Select one of the parameters using the
◄
►
arrow keys, then edit using the
▲
▼
arrow keys.
Edit the Demodulation type and the FEC rate.
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