Comtech EF Data SLM-5650A - Manual (Page 96)

SLM-5650A Satellite Modem Revision 8
Front Panel Operation MN-SLM5650A
5–14
5.2.3.2 CONFIG: Rx
Rx: Demod DataRate Overhead Frequency
Acq Buffer Misc CnC Spreading (E)
Use the arrow keys to select Demod, DataRate, Overhead, Frequency, Acquisition,
Buffer, Misc, CnC, or Spreading and then press [ENT]:
Submenu Option
Demod Select FEC, Type, Rate, RS, Diff, or Descrambler.
DataRate Enter a selected data 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 desired frequency and spectral inversion.
Acquisition Select acquisition range and reacquisition time period.
Buffer
Select buffer reference clock source, recenter, the buffer size, Bit mode or millisecond mode
and external Framing for Plesiochronous operation.
Misc Select Clk and Data Phase, BPSK Bit Ordering, and Eb/No Threshold.
CnC Select Mode, Acquisition, or SearchDelay.
Spreading
Select the Rx spreading factor and equation. View the Rx Chip Rate. This menu is selectable
only if the modem type has been set to LDPC.
Note: Framing is applicable only when using externally framed data, with the following formats:
T1 or E1 G.704; T2 G.743, G.704, G.707; and E2 G.742, G.704, G.745.
CONFIG: Rx  Demod
Demod: FEC:VIT Type:BPSK Rate:3/4
RS:N/A Diff:On Descram:OM-73 (E)
First, use the arrow keys to select FEC, Type, Rate, RS, Diff, or Descram, 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 Settings
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