Config: Tx) Fec (Fec Type); Config: Tx) Mod (Modulation); Important Note - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Front Panel Operation
change the modulation type from QPSK to 16-QAM. In this case, Rate 1/2 is no
longer a valid code rate, and so it will be automatically changed to the nearest valid
code rate (Rate 3/4).

5.2.2.1.3.1 (CONFIG: Tx) FEC (FEC Type)

Tx FEC: Viterbi Vit+RS
TCM+RS TPC Uncoded
IMPORTANT NOTE: All available choices are presented at all times. If an
option is not installed (either Hardware, or FAST) or valid, the ◄ ► arrow keys
will force the cursor to skip past the unavailable choice.
CASE
Viterbi
Vit+RS
(Viterbi +Concatenated Reed-Solomon)
TCM+RS
(Trellis Coded Modulation +
Concatenated Reed-Solomon)
TPC
(Turbo Product Codec)
Uncoded

5.2.2.1.3.2 (CONFIG: Tx) Mod (Modulation)

Modulation: BPSK QPSK
OQPSK 8-PSK 16-QAM 8-QAM

IMPORTANT NOTE:

option is not installed (either Hardware, or FAST) or valid, the ◄ ► arrow keys
will force the cursor to skip past the unavailable choice.
CASE
BPSK
QPSK
OQPSK
8-PSK
8-QAM
16-QAM
RULES
ALWAYS VALID
If the RS codec is installed
If the RS codec is installed
AND 8-PSK FAST is enabled
If the TPC codec is installed
Always valid - BPSK, QPSK and
OQPSK only.
All available choices are presented at all times. If an
RULES
Valid for all FEC types except TCM+RS
Valid for all FEC types except TCM+RS
Valid for all FEC types except TCM+RS
Requires TCM+RS OR Turbo codec AND requires 8-PSK/ 8-QAM FAST option
Requires Turbo codec AND requires 8-PSK/8-QAM FAST option
Requires Viterbi+RS OR Turbo codec AND requires 16-QAM FAST option
5–13
Revision 12
MN/CDM570L.IOM
COMMENT
Fixed at 8-PSK and Rate 2/3
Forces Code Rate to 1:1 (uncoded)