AMT-70/AMT-73/AMT-75 Installation and Operation
4.2.6 Executing Variable Commands from the Front Panel
In some cases, when a parameter is changed (such as TX PWR, etc.) followed by ENTER, the
parameter is executed immediately. These are independent parameters, since changing their values
do not affect any other parameter in the menu.
However, there are certain command parameters in the TX and RX menus that are dependant on the
settings of other parameters, such as TX or RX UNITS, MODulation or DEMODulation, FEC CODE,
code RATE, RSRATE, and DATA rate, and therefore all of the parameters need to be checked and
changed if necessary. Executing these commands is performed using the RECONFIGURE =
READY/CONFIRM function in the TX and RX menus, respectively. Figure 20 below shows the valid
parameters.
Currently, TX and RX CARRIER FREQ also require that RECONFIGURE in the TX and RX menus to
be executed, but there are no restrictions for any of the FEC Types shown in the figure.
Figure 20: Acceptable Parameters for FEC Type
FEC Type Code
Rate
Reed
Solomon
Modulation Scrambler Diff
Coding
Units Data Rate
Viterbi, Intelsat
4
½, ¾,
219 or 126 BPSK, QPSK,
OQPSK
On/Off On/Off SPS/BPS Must be within Symbol
Rate of 32 ksps to 40 Msps
Viterbi, Intelsat On/Off SPS/BPS
Trellis
219 or 126 8PSK On/Off Must be within Symbol
Rate of 32 ksps to 40 Msps
Viterbi, DSNG
,
5
/
6
,
8
/
9
Automatic –
204,188
Must be within Symbol
Rate of 32 ksps to 40 Msps
8PSK Always On N/A SPS/BPS
Viterbi, DSNG
¾,
Automatic –
204,188
16QAM Always On Must be within Symbol
Rate of 32 ksps to 40 Msps
N/A SPS/BPS
Viterbi, DVBS
2
½, ,
¾,
5
/
6
,
Always On Must be within Symbol
Rate of 32 ksps to 40 Msps
Automatic –
204,188
QPSK, OQPSK N/A SPS/BPS
None
2 Uncoded None BPSK, QPSK,
OQPSK, 8PSK,
16QAM
On/Off On/Off SPS/BPS Must be within Symbol
Rate of 32 ksps to 40 Msps
OM73
2
Uncoded,
½, ¾
None BPSK, QPSK,
OQPSK
On/Off On/Off SPS/BPS Must be within Symbol
Rate of 32 ksps to 40 Msps
TPC16K
2,5
2
/
5
,
3
/
5
,
8
/
9
,
19
/
20
None BPSK, QPSK,
OQPSK, 8PSK,
16QAM
On/Off N/A SPS/BPS Must be within Symbol
Rate of 32 ksps to 40 Msps
TPC4K
2
¾
None BPSK, QPSK,
OQPSK, 8PSK,
16QAM
On/Off N/A SPS/BPS Must be within Symbol
Rate of 32 ksps to 40 Msps
ENTER the changed values from the TX or RX menu, then arrow down to the RECONFIGURE=
READY, press ENTER and then ENTER again to CONFIRM.
80
4
Offset QPSK is limited to 20MSymbols/Sec
5
Only 8/9 or 19/20 Code Rates make sense for 8PSK and 16QAM Modulation schemes.
NOTE:
TX and RX RECONFIGURE commands from the front panel are TRESET and RRESET in the
CLI mode (RS-232 or RS-485 interface).
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General