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CDM-625 Advanced Satellite Modem
Front Panel Operation
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
IMPORTANT
there is a 1 in 4 chance the data will be correct.
When selecting Reed-Solomon On, proceed to the next menu.
CONFIG: Tx
Reed-Solomon Encoding =Standard(126/112)
(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:
•
•
•
•
•
•
5.4.3.5
CONFIG: Tx
Modulation=QPSK
FEC Rate=1/2
This menu permits the user to edit the Modulation type and the FEC rate. Select one of the
parameters using the
The Encoder type dictates the Modulation Type and FEC rate choices:
Encoder Type
No Encoder
Non-Turbo Encoder
FEC
Reed-Solomon On
IESS-310, open or closed network
IBS, open or closed network
EDMAC or D&I++, closed network
IDR, open network
ESC++ closed network
Unframed closed network
Comtech standard
Legacy EF Data
Mod (Modulation)
(B,Q,OQ,8PSK,16Q,8QAM)
(1/2,3/4,7/8)
◄ ►
arrow keys, then edit it using the
Modulation Type
BPSK
QPSK, OQPSK
BPSK
TCM 8-PSK (FAST option)
QPSK, OQPSK
16-QAM (Vit+RS only)
MN-0000036 (Ref MN/CDM625.IOM)
219/201
126/112
200/180
225/205, 219/201 or 194/178
126/112
220/200
225/205, with V.35 scrambling
▲ ▼
FEC Rate Choice
Fixed at 1/1
Fixed at 1/1
Fixed at Rate 1/2
Fixed at Rate 2/3
1/2, 3/4, 7/8
3/4, 7/8
5–13
Revision 1
(v)
(34v)
arrow keys.
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