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Option
Type
(Modulation)
Rate
RS
Diff
Scram
Front Panel Operation
Setting
BPSK, QPSK, or OQPSK are standard; 8PSK, 8QAM, or 16QAM are optional. Note
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
Reed-Solomon Encoder: On or Off
Differential Encoder: On or Off
Scrambling (for energy dispersal): 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 scrambler synchronized to the Turbo block.
•
OM73 – Linkabit OM-73 modem compatibility mode.
•
Synch – Synchronous scrambler synchronized to the Reed-Solomon.
•
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.
5–11
SLM-5650B Satellite Modem
Revision 2
• 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
MN-SLM-5650B
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