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CDM-Qx Satellite Modem
Front Panel Operation
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 modulation 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%Tx%FEC) – TX FEC TYPE
Tx FEC: Vit Vit+RS TCM+RS
TPC
Selecting Vit+RS or TCM+RS displays the following submenu:
Tx Rs (n/k):
IESS-310 network
IMPORTANT
FEC Type
Vit (Viterbi)
Vit+R-S (Viterbi +Concatenated
Reed-Solomon)
TCM+R-S (Trellis Coded
Modulation + Concatenated Reed-
Solomon)
TPC (Turbo)
(Config%Tx%Mod) – MODULATION SCHEME
Modulation: BPSK QPSK 8-PSK
16-QAM
IMPORTANT
CASE
BPSK
QPSK
8-PSK
16-QAM
(◄ ►, ENT)
(◄ ►, ENT)
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.
(◄ ►, 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.
RULES
Valid for all FEC types except TCM+R-S
Valid for all FEC types except TCM+R-S
Valid for TCM+R-S, TPC (Turbo) requires 8-PSK FAST option
Valid for Viterbi + R-S, TPC (Turbo) requires 16-QAM FAST option
(219/201)
RULES
Always valid
Always valid
If 8-PSK FAST is enabled
If the TPC codec is installed
5–14
Revision 6
MN/CDMQx.IOM
COMMENT
Fixed at 8-PSK and
Rate 2/3
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