Comtech EF Data CDM-600/600L - Manual (Page 93)

CDM-600/600L Open Network Satellite Modem Revision 3
Front Panel Operation MN/CDM600L.IOM
5–17
5.4.4.3 CONFIG: RX
Æ DEMOD (Demodulation)
DEMODULATION = QPSK(B,Q,OQ,8-PSK,16QAM)
FEC RATE = 1/2 (1/2,3/4,7/8)
Using the [ ←][→] arrow keys, select the DEMODULATION type (top line) or the FEC
RATE (bottom line), then change that selection by using the [
↑][↓] arrow keys.
The Decoder type dictates the Demodulation 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 Fixed at Rate 1/2
Fixed at Rate 2/3
1/2, 3/4, 7/8
3/4, 7/8
Turbo
(with the 5Mbps Codec installed):
BPSK
QPSK, OQPSK
8-PSK, 16-QAM (FAST option) 5/16, 21/44
Fixed at 3/4
Fixed at 3/4
Turbo
(with the 20Mbps Codec installed, or
the TPC/LDPC Codec installed):
BPSK
QPSK, OQPSK
8-PSK (FAST option)
16-QAM (FAST option) 5/16, 21/44
1/2, 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 option)
16-QAM (FAST option) 1/2
1/2, 2/3, 3/4
3/4, 7/8
3/4
Note: If the TPC/LDPC Codec is installed and TPC is selected from the DECODER menu, the
options appear as shown:
DEMODULATION = QPSK(B,Q,OQ,8-PSK,16Q,8QAM)
FEC RATE = 1/2 (1/2,3/4,7/8)
5.4.4.4 CONFIG: RX
Æ DATA
RECEIVE DATA RATE =00064.000 kbps
DATA INVERT = OFF (ON,OFF)
The top line permits the data rate to be edited. Select the digit of RECEIVE DATA RATE to be
edited using the [
←][→] arrow keys. The value of the digit is then changed using the [↑][↓]
arrow keys. Press [ENT] when done.
NOTE: The minimum and maximum data rates are dependent on Demodulation type and FEC
Decoder 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.