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5 config: tx ( mod (modulation), 5 config: tx  mod (modulation) – Comtech EF Data CDM-625 User Manual

Page 117

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CDM-625 Advanced Satellite Modem

Revision 15

Front Panel Operation

MN-CDM625

5–17

5.2.1.3.5 CONFIG: Tx Mod (Modulation)

Mod=QPSK (B,Q,OQ,8PSK,16Q,8QAM)

FEC Rate=1/2 (1/2,3/4,7/8)

()

Use the

◄ ►

arrow keys to select the Modulation type (top line) or the FEC rate (bottom line),

and then use the

▲▼

arrow keys to change that parameter selection. The Encoder type dictates

the Modulation Type and FEC rate choices:

Encoder Type

Modulation Type

FEC Rate Choice

No Encoder

BPSK

QPSK, OQPSK

Fixed at 1/1

Fixed at 1/1

Non-Turbo Encoder

BPSK

TCM 8-PSK (FAST option)

QPSK, OQPSK

16-QAM (Vit+RS only)

Fixed at Rate 1/2

Fixed at Rate 2/3

1/2, 3/4, 7/8

3/4, 7/8

TPC

(with TPC/LDPC Codec installed)

BPSK

QPSK, OQPSK

8-PSK (FAST option)

16-QAM (FAST option)

5/16, 21/44

1/2 (aka 21/44), 3/4, 7/8, 0.95

3/4, 7/8, 0.95

3/4, 7/8

LDPC

(with TPC/LDPC Codec installed)

BPSK

QPSK, OQPSK

8-PSK, 8-QAM (FAST)

16-QAM (FAST option)

Fixed at 1/2

1/2, 2/3, 3/4

2/3, 3/4

Fixed at 3/4

VFEC

(with VersaFEC Codec installed)

BPSK

QPSK

8-QAM (FAST option)

16-QAM (FAST option)

Fixed at 0.488

0.533, 0.631, 0.706, 0.803

0.576, 0.642, 0.711, 0.780

0.644, 0.731, 0.780, 0.829, 0.853

ULL

(with VersaFEC Codec installed)

BPSK

QPSK

Fixed at 0.493

0.493, 0.654, 0.734

If selecting TPC from the FEC menu with TPC/LDPC Codec installed, the options appear as

shown:

Mod=QPSK (B,Q OQ,8PSK,16Q,8QAM)

FEC Rate=1/2 (1/2,3/4,7/8,0.95) ()

If selecting VFEC from the FEC menu with VersaFEC Codec installed, the options appear as

shown:

Mod=BPSK (B,Q,8QAM,16QAM) ()

FEC Rate=0.488 (Fixed)

If selecting ULL from the FEC menu with VersaFEC Codec installed, the options appear as shown: