Comtech EF Data SLM-5650A - Manual (Page 97)

SLM-5650A Satellite Modem Revision 8
Front Panel Operation MN-SLM5650A
5–15
Option Settings
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.
Rate • 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 - .382, .456, .547, 1/2, 2/3, 3/4, 7/8
• HP – 1/2, 2/3, 3/4
RS Reed-Solomon Decoder: On or Off.
Diff Differential Decoder: On or Off.
Descram
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.
CONFIG: Rx  DataRate
Rx Data Rate: 020000.000 kbps
Sym Rate: 0266666.666 ksps(E)
Use Method 1 or Method 2 to enter the desired Rx Data Rate (in kilobits per second):
Method Procedure
1 Use the number keypad and enter the desired data rate (see Appendix B. OPERATIONS GUIDE).
2
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.