Comtech EF Data SNM-1001L - Manual (Page 166)

SNM-1001L Satellite Modem Revision 1
Modem Types MN/SNM1001L.IOM
5–4
5.3 Reed-Solomon Modes
Reed-Solomon polynomial is compatible with Intelsat (IESS-308, IESS-309, IESS-310, and
IESS-314). Table 5-3 shows the Reed-Solomon parameter used for various configurations.
Table 5-3. Reed-Solomon Modes
Modem Menu 1,2 Description
Utility Modem
Type
Configuration
Modulator TX
or Demodulator
RX Rate 3
Utility
Modulator or
Demodulator 4
Overhead Type Scrambler N K T I Mode
EFD QPSK EFD Closed
No Overhead
EFD MOD
V.35 225 205 10 8
EFD 8PSK 2/3 EFD CLOSED
IESS-310 ON No Overhead EFD MOD
V.35 219 201 9 4
Non-IESS-310
Compliant 8PSK 2/3
only
IESS-308/309
Compliant (Open) only
Non-IESS modes For
All other Rate (BPSK,
QPSK, OQPSK,
5 8-PSK 5/6, 5 16-QAM)
IESS-314 Compliant (8PSK 2/3 only)
Same as IESS-310 Compliant 8PSK 2/3
Where:
N = Coded Reed-Solomon block length (Number of bytes)
K = Uncoded Reed-Solomon block length (Number of bytes)
T = Maximum number of byte corrections (T =[N-K] /2)
I = Interleave Depth
Notes:
1. For IESS-308/309 compliant operation, it is necessary to enable INTELSAT OPEN under
both the Utility: Modulator and Utility: Demodulator menus before selecting an open
network type from the Modem Type menu under Utitlity:Modem Type.
2. For IESS-310 (8-PSK 2/3) compliant operation, it is necessary to make the selections in
the previous step and select TX IESS-310 Mode = On under the Utility: Modulator menu
and select RX IESS-310 Mode = ON under Utility: Demodulator menu.
3. Data Rate is TX-X or RX-X under Configuration: Modulator or
Configuration: Demodulator menus.
4. When the modulator type is not 8-PSK, the IESS-310 ON/OFF selection has no effect.