Mocomtech CDM-QX - Manual (Page 81)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Front Panel Operation MN/CDMQX.IOM
5–15
5.4.2.3 CONFIG: Tx
Æ Code
Tx Code Rate: 5/16 21/44 1/2
2/3 3/4 7/8 17/18 (◄ ►)
For the Transmit Code Rate, select 5/16, 21/44, 1/2, 2/3, 3/4, 7/8, or 17/18 using the ◄ ► arrow
keys, then press
ENTER
. Note the following:
CASE RULES
5/16
Valid for BPSK and Turbo
21/44 Valid for BPSK, QPSK and Turbo
1/2 Valid for BPSK, QPSK, Viterbi, Viterbi+R-S
2/3
Valid for TCM+R-S only (8-PSK)
3/4 Valid for QPSK, 8-PSK, and 16-QAM
7/8 Valid for QPSK, 8-PSK, and 16-QAM
17/18
Valid for QPSK, 8-PSK , and Turbo
All possible choices are presented at all times. If an option is not installed (either
Hardware, or FAST) or not valid, the ◄ ► arrow keys will force the cursor to
skip past the unavailable choice.
5.4.2.4 CONFIG: Tx Æ Data
Tx Data Rate: 05000.000kbps
Sym:02500.000ksps
For the Transmit Data Rate, select 5/16, 21/44, 1/2, 2/3, 3/4, 7/8, or 17/18 using the ◄ ► arrow
keys, then press
ENTER
.
Note: In Quad Drop & Insert (QDI) mode, these data rates are read-only; otherwise, they are
read/write. The data rate will be the sum of the tributary rates for all ports. This also will show
the calculated symbol rate and Nx64kbps (where N=001 to 128).
The overall range of data rates is from 32 to 20000 kbps. The overall range of
symbol rates is up to 10000 ksps. The minimum data rate is set to 32 kbps only
for BPSK and QPSK, and the maximum data rates are dependent on modulation
type and FEC encoder rate. If the user changes the modulation or FEC, and the
currently selected data rate can no longer be supported, the data rate will be
adjusted automatically, up or down, keeping the symbol rate constant. The
bottom line of the display shows the symbol rate, based on FEC type,
modulation, FEC Code Rate, and Data Rate. The valid ranges of data rate are
shown in the table that follows on the next page.
IMPORTANT