Comtech EF Data SLM-5650A Installation And Operation Manual page 91

SLM-5650A Satellite Modem
Front Panel Operation
5.2.3.1 CONFIG: Tx
Tx: Mod DataRate Overhead Frequency
Power Clocking Misc Spreading (E)
Use the  arrow keys to select a Tx configuration submenu, and then press [ENT]:
Submenu
Mod
DataRate
Overhead
Frequency
Power
Clocking
Misc
Spreading
CONFIG: Tx
Mod: FEC:VIT
RS:Off
First, use the  arrow keys to select FEC, Type, Rate, RS, Diff, or Scram, and then press
[ENT]. Then, for any option, use the arrow keys to scroll through the available settings.
Press [ENT] once again when done.
Option
FEC
Type
(Modulation)
Option
Select: FEC, Type, Rate, RS, Diff, and Scrambler.
Enter a selected data rate and view the symbol rate (see Appendix B. OPERATIONS GUIDE).
Select the overhead type, view the overhead rate, select the Reed-Solomon Code Word, and
depth.
Select the desired frequency and spectral inversion.
Select desired output power level and state of the output.
Select the transmit clock source and SCT reference.
Select CLK/DataPhase and BPSK Bit Ordering.
Select the Tx spreading factor and equation. View the Tx Chip Rate. This menu is selectable
only if the modem type has been set to LDPC.
Mod

Type:QPSK
Diff:On Scram:OM-73
Setting
VIT or NONE are standard; the remainder are optional. Note the following:
• VIT (Viterbi) – K=7 convolutional encoder.
• NONE – Uncoded.
• TURBO – Turbo Product Code, which is a block code.
• SEQ – Sequential Encoder/Decoder.
• ULL – Ultra Low Latency LDPC
• LL – Low Latency LDPC
• HP – High Performance LDPC
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.
•
Rate:1/2
(E)
5–9
Revision 8
MN-SLM5650A