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CDM-Qx Satellite Modem
Front Panel Operation
IMPORTANT
If the user changes a parameter within this hierarchy, the other parameters may become
invalid. In this case, the software will change those other parameters, in order that the
configuration remains valid at all times.
Example: Suppose the user has selected Viterbi + Reed-Solomon, QPSK, Rate 1/2.
Now, the user changes the demodulation type from QPSK to 16-QAM. In this case, Rate
1/2 is no longer a valid code rate, and so it will be automatically changed to the nearest
valid code rate (Rate 3/4).
Each of the configuration sub-branches will now be described in detail.
(Config%Rx%FEC) – RX FEC TYPE
Rx FEC: Vit Vit+RS
TPC
IMPORTANT
CASE
Vit (Viterbi)
Vit+R-S (Viterbi +Concatenated
Reed-Solomon)
TCM+R-S (Trellis Coded
Modulation + Concatenated
Reed-Solomon)
TPC (Turbo)
If Vit+RS or TCM+RS displays the following submenu:
Rx Rs (n/k):
IESS-310 network
The FEC type takes the highest configuration priority, and the selection
here depends on what, if any, optional plug-in Codecs are installed. The
choice of FEC type then determines what demodulation types, code
rates, and data rates are available. The order of hierarchy is therefore:
FEC type ► Demodulation type ► Code Rate ► Data Rate
(Highest)
(◄ ► ENT)
All possible choices are presented at all times. If an option is not
installed (either Hardware, or FAST) or valid, the ◄ ► arrow keys will
force the cursor to skip past the unavailable choice.
(◄ ►, ENT)
TCM+RS
RULES
Always valid
Always valid
If 8-PSK FAST is enabled
If the TPC codec is installed
(219/201)
5–22
Revision 6
MN/CDMQx.IOM
(Lowest)
COMMENT
Fixed at 8-PSK and Rate
2/3
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