Mocomtech CDM-QX - Manual (Page 80)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Front Panel Operation MN/CDMQX.IOM
5–14
5.4.2.1 CONFIG: Tx
Æ FEC
Tx FEC: Vit Vit+RS TCM+RS
TPC (◄ ►,ENT)
For the Transmit FEC type, select Vit, Vit+RS, TCM+RS, or TPC using the ◄ ► arrow keys,
then press
ENTER
.
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.
Note the following:
FEC TYPE RULES COMMENT
Vit (Viterbi) Always valid.
Vit+RS (Viterbi +Concatenated
Reed-Solomon)
Always valid.
TCM+RS (Trellis Coded Modulation
+ Concatenated Reed-Solomon)
Only if 8-PSK FAST is
enabled.
Fixed at 8-PSK and Rate 2/3.
TPC (Turbo)
If the TPC codec is installed
and Data Rate FAST option
is enabled.
Selecting VIT+RS or TCM+RS displays the following submenu:
Tx Rs (n/k) (◄ ►,ENT)
IESS-310 network (219/201)
5.4.2.2 CONFIG: Tx Æ Mod
Modulation: BPSK QPSK 8-PSK
16-QAM (◄ ►,ENT)
For the Transmit Modulation Scheme, select BPSK, QPSK, 8-PSK, or 16-QAM using the ◄ ►
arrow keys, then press
ENTER
.
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.
Note the following:
CASE RULES
BPSK Valid for all FEC types except TCM+R-S
QPSK Valid for all FEC types except TCM+R-S
8-PSK Valid for TCM+R-S, TPC (Turbo) requires 8-PSK FAST option
16-QAM Valid for Viterbi + R-S, TPC (Turbo) requires 16-QAM FAST option