Comtech EF Data CDM-600L Installation And Operation Manual page 64

CDM-600L Satellite Modem
Front Panel Operation
Select one of the parameters using the [←] [→] arrow keys, and then edit using the [↑] [↓]
arrow keys. Edit the Modulation type and the FEC rate.
The Modulation Type and FEC rate choices are dictated by the Encoder type:
No Encoder:
Non-Turbo Encoder:
Turbo (with the 5Mbps
Codec installed):
Turbo (with the 20Mbps
Codec installed, or the
TPC/LDPC Codec
installed):
LDPC (with the
TPC/LDPC Codec
installed):
The following window will appear if the TPC/LDPC Codec is installed:
MODULATION= QPSK (B,Q,OQ,8-PSK,16Q,8QAM)
FEC RATE = 1/2
CONFIG: TX: DATA
TRANSMIT DATA RATE =00064.000 kbps
DATA INVERT = OFF (ON,OFF)
The top line permits the data rate to be edited. Select the digit of Transmit Data Rate to be
edited using the [←] [→] arrow keys.
The value of the digit is changed using the [↑] [↓] arrow keys. Press ENTER.
NOTE: The minimum and maximum data rates are dependent on Modulation type and
FEC encoder Rate. If the user changes the Modulation or FEC, and the data rate becomes
invalid, the Data Rate will be adjusted automatically. The upper range of data rate will be
dictated by the FAST option installed.
BPSK Fixed at 1/1
QPSK, OQPSK Fixed at 1/1
BPSK Fixed at Rate 1/2
TCM 8-PSK Fixed at Rate 2/3
QPSK, OQPSK 1/2, 3/4 or 7/8
16-QAM 3/4 or 7/8
BPSK 5/16 or 21/44
QPSK, OQPSK Fixed at 3/4
8-PSK, 16-QAM Fixed at 3/4
BPSK 5/16 or 21/44
QPSK, OQPSK 1/2, 3/4, 7/8 and 0.95
8-PSK 3/4, 7/8 and 0.95
16-QAM 3/4 and 7/8
BPSK 1/2
QPSK, OQPSK 1/2, 2/3, 3/4
8-PSK, 8-QAM 3/4, 7/8
16-QAM 3/4
(1/2,3/4,7/8)
6–12
Revision 2
MN/CDM600L.IOM
(FAST option)
(FAST option)
(FAST option)
(FAST option)
(FAST option)
(FAST option)
(FAST option)