SDM-300L3 Satellite Modem
Revision 1
Front Panel Operation
MN/SDM300L3.IOM
4–88
FUNCTION SELECT: UTILITY: MODULATOR: ENCODER TYPE
ENCODER TYPE
VITERBI
Encoder type selection. Select VITERBI, SEQUENTIAL, or TURBO encoder type.
Notes:
1. A Sequential Encoder Type and a 3/4 Code Rate combination are not compatible
with a CSC CLOSED Modulator Type.
2. Change only when Modem Type (under
Utility: Modem
Type) is EFD, ASYNC,
or Custom.
FUNCTION SELECT: UTILITY: MODULATOR:
SCRAMBLER
TYPE
SCRAMBLER TYPE
INTELSAT V.35
This menu is status only and displays:
•
With Overhead and IBS Scrambler ON: IBS SYNC
•
With RS Scrambler On: EFD MOD V.35 or IBS SYNC
•
With Turbo Scrambler On: TURBO SYNC
Intelsat V.35, FDC MOD V.35, ITU V.35, or Off.
Scrambler Type
Description
Intelsat V.35
Self-SYNC scrambling per IESS-308.
FDC MOD V.35
Compatible with Fairchild modems.
ITU V.35
Closed Network Viterbi and Sequential with No Reed-Solomon.
OFF Scrambling
is
disabled.
IBS SYNC
Intelsat per IESS-309.
EF MOD V.35
Comtech EFD proprietary scrambling for Closed Network with
Reed-Solomon On.
Turbo SYNC
Turbo SYNC - scrambler
