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Option
(Modulation)
Rate
RS
Diff
Descram
CONFIG: Rx DataRate
Rx Data Rate:
Sym Rate:
Use Method 1 or Method 2 to enter the desired Rx Data Rate (in kilobits per second):
Method
1
2
Front Panel Operation
Settings
the following:
BPSK – Bi Phase Shift Keying.
•
QPSK – Quadrature Phase Shift Keying.
•
OQPSK – Offset Quadrature Phase Shift Keying.
•
8PSK – 8 Phase Shift Keying.
•
8QAM – 8 Quadrature Amplitude Modulation
•
16QAM – 16 Quadrature Amplitude Modulation.
•
Viterbi – 1/2, 2/3, 3/4, 5/6, or 7/8
•
Uncoded – 1/1
•
Turbo – 5/16, 3/4, 7/8, 17/18, or 21/44
•
Sequential – 1/2, 3/4, 7/8
•
ULL – 1/2, 2/3, 3/4
•
LL - .378, .451, .541, 1/2, 2/3, 3/4, 7/8
•
HP – 1/3, 1/2, 2/3, 3/4
•
Reed-Solomon Decoder: On or Off.
Differential Decoder: On or Off.
Descrambling: V.35, MOD-V.35, IBS, TURBO, OM73, Synch, or Off. Note the
following:
V.35 – ITU standard;
•
MOD-V.35 (modified V.35) – Comtech EF Data Closed Network with Reed-
•
Solomon compatible;
IBS – Used for IESS-309 operation;
•
Turbo – Synchronous descrambler synchronized to the Turbo block;
•
OM-73 – OM-73 Linkabit modem compatibility mode;
•
Synch – Synchronous descrambler synchronized to the Reed-Solomon frame.
•
When changing Modulation type, the data rate must be set to a rate supported by
the modulation type, or the change to the modulation type will not be allowed.
Some choices will only be visible if the modem is set to a compatible mode, or if
an option is installed or enabled.
020000.000 kbps
0266666.666 ksps(E)
Procedure
Use the number keypad and enter the desired data rate (see Appendix B.
OPERATIONS GUIDE).
Use the arrow keys to scroll through and select the desired data rate or symbol
rate. When scrolling through the data rates, the symbol rate is automatically recalculated
and displayed.
5–17
SLM-5650B Satellite Modem
Revision 2
MN-SLM-5650B
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