Datum Systems M7 Series - Page 98

Maintenance M7/M7L/M7LT Modular Satellite Modem
3-42 M7/M7L/M7LT - Rev. 0.05
Modulator Parameters
Representation
Type
Entry
Description
IF Modulation
QPSK
Selection
0 = BPSK, 1 = QPSK,
2 = OQPSK, 3 = 8PSK,
4 = 8QAM, 6 = 16QAM
Modulation Mode. Some values
left available for new options.
IF Spectrum
Normal
Selection
0 = Normal, 1 = Inverted
Modulation Spectrum control
IF Filter Roll-Off
0.35
Selection
0=0.40, 1=0.35, 2=0.30,
3=0.25, 4=0.20, 5=0.15,
6=0.10, 7=0.08, 8=0.05
Sets the Alpha roll-off factor for
the modulator filters
IF AUPC Mode
Disabled
Selection
0 = Disable, 1 = Enable,
Automatic Uplink Power Control.
»IF AUPC Eb/No
8.0dB
Numeric
3.0 to 20.0 dB
AUPC remote receive Eb/No
level set point.
»IF AUPC Max Level
–5.0 dB
Numeric
+5.0 dBm to Minimum level
Max. Transmit level under AUPC
control
»IF AUPC Min Level
–14.0 dB
Numeric
Maximum level to –35 dBm
Min. Transmit Level under AUPC
control
IF Mute
Automatic
Selection
0 = Automatic,
1 = Confirm,
2 = Manual
3 = Manual & Power Loss
Manual requires manual Carrier
enable after Mod output change.
Option 3 forces Cxr off after
power fail.
IF Impedance
75 Ohm
Selection
0 = 50, 1 = 75
Transmit IF impedance.
Data Bit Rate
4.096000Mbps
Numeric
1.2 kbps to 59.04 Mbps in 1
bps resolution. Entered in
kbps but display will change
to Mbps if the rate is
1000.000 kbps or higher.
Modulator Bit Rate – The max
and min are determined by
settings and options.
Data Symbol Rate
2.730667Msps
Numeric
2.4 ksps to 14.76Msps in
1sps resolution. Entered in
ksps but display will change
to Msps if the rate is
1000.000 ksps or higher.
Modulator Symbol Rate – The
max and min are determined by
settings and options.
Data Rate Entry Mode
Bit Rate
Selection
0 = Bit Rate,
1 = Symbol Rate
Determines which parameter is
used to enter the modulator rate
Data Send Interface
Disabled
Selection
0 = Disabled,
1 = Installed Interface Option
in Slot 3
2 = Installed Interface Option
in Slot 4
Sets the active interface for the
data input to the modulator.
Data FEC Mode
Viterbi
Selection
0 = None
1 = Viterbi,
2 = TCM,
3 = TPC
4 = TPC
5 = LDPC
Reed-Solomon is enabled below.
Please note that available FEC
options are determined by other
modem settings.
Data FEC Option
Swap C0/C1
Selection
0 = Normal,
1 = Swap C0/C1,
(Vit) Sets the bit compatibility of
the Viterbi FEC encoder.