Comtech EF Data SLM-5650A - Manual (Page 91)

SLM-5650A Satellite Modem Revision 8
Front Panel Operation MN-SLM5650A
5–9
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 Option
Mod Select: FEC, Type, Rate, RS, Diff, and Scrambler.
DataRate Enter a selected data rate and view the symbol rate (see Appendix B. OPERATIONS GUIDE).
Overhead
Select the overhead type, view the overhead rate, select the Reed-Solomon Code Word, and
depth.
Frequency Select the desired frequency and spectral inversion.
Power Select desired output power level and state of the output.
Clocking Select the transmit clock source and SCT reference.
Misc Select CLK/DataPhase and BPSK Bit Ordering.
Spreading
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.
CONFIG: Tx  Mod
Mod: FEC:VIT Type:QPSK Rate:1/2
RS:Off Diff:On Scram:OM-73 (E)
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 Setting
FEC 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
Type
(Modulation)
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.