Specifications

SDM-300L3 Satellite Modem Revision 0

Front Panel Operation MN/SDM300L3.IOM

4–78

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

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