Product specifications

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Front Panel Operation MN/CDMQX.IOM
5–22
5.4.3.1 CONFIG: Rx Æ FEC
Rx 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)
If 8-PSK FAST is enabled Fixed at 8-PSK and Rate 2/3
TPC (Turbo)
If the TPC codec is installed
SelectingVIT+RS or TCM+RS displays the following submenu:
Rx Rs (n/k) (◄ ►,ENT)
IESS-310 network (219/201)
5.4.3.2 CONFIG: Rx Æ Demod
Demodulation: BPSK QPSK 8-PSK
16-QAM (◄ ►,ENT)
For the Receive Demodulation 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