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CDM-625 Advanced Satellite Modem
Front Panel Operation
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)
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
IMPORTANT
there is a 1 in 4 chance that the data will be correct.
Select On or Off for Reed-Solomon using the
selecting Reed-Solomon On, proceed to the next menu.
CONFIG: Rx
Reed-Solomon Decoding =IESS-310(219/201)
(Standrd(126/110),IESS-310(219/201))
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
•
IBS, open or closed network
•
EDMAC or EDMAC2, closed network
•
IDR, open network
•
ESC++ or D&I++, closed network
•
Unframed closed network
5.4.4.4
CONFIG: Rx
Demodulation=QPSK (B,Q,OQ,8PSK,16QAM)
Select one of the parameters using the
Edit the Demodulation type and the FEC rate.
FEC
Reed-Solomon On
Comtech standard
Legacy EF Data
Demod (Demodulation)
FEC Rate=1/2
◄ ►
arrow keys, then press ENTER. When
▲ ▼
219/201
126/112
200/180
225/205, 219/201 or 194/178
126/112
220/200
225/205, with V.35 scrambling
(1/2,3/4,7/8)
arrow keys, then edit using the
5–18
MN-0000036 (Ref MN/CDM625.IOM)
(34v)
(v)
(34v)
arrow keys.
▲ ▼
Revision 1
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