Datum Systems M7 Series - Page 104

Maintenance M7/M7L/M7LT Modular Satellite Modem
3-48 M7/M7L/M7LT - Rev. 0.05
Demodulator Parameters
Representation
Type
Entry
Description
Data Bit Rate
4.096000 Mbps
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.
Demodulator Bit Rate – The max
and min are determined by
settings and options.
Data Symbol Rate
2.730677 Msps
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.
Demodulator 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 demodulator
rate
Data Rcv 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 output from the
demodulator.
Data FEC Mode
Viterbi
Selection
0 = None
1 = Viterbi,
2 = TCM,
3 = N/A
4 = TPC
5 = LDPC
Reed-Solomon is enabled below.
Please note that available FEC
options are determined by
installed options and other
modem settings
Data FEC Option
Normal
Selection
0 = Normal,
1 = Swap C0/C1,
(Vit) Sets the bit compatibility of
the Viterbi FEC decoder.
Data FEC Code Rate
3/4
Selection
0 = 1/2, 1 = 3/4, 2 = 5/6
3 = 7/8.
0 = 2/3 in 8PSK TCM
(Vit) Sets the code rate of the
Viterbi FEC decoder.
Date RS Mode
IESS-309
Selection
0 = Disabled,
1 = IESS-308
2 = IESS-309
3&4 = CT 200-220
5 = Custom
(Vit + R-S) Reed-Solomon
column and options only
available if enabled. Entry is not
shown when TPC enabled.
»Data RS (n)
219
Numeric
In Custom Mode only:
Available n values
Read only in other modes
(Vit + R-S) Block size
n = 22 to 255. Entry is not shown
when TPC enabled.
»Data RS (k)
201
Numeric
In Custom Mode only:
Available k values
Read only in other modes
(Vit + R-S) k = 20 to 253,
k must be 2 to 20 less than n.
Entry is not shown when TPC
enabled.
»Data RS Depth
4
Selection
In Custom Mode only:
0 = 4, 1 = 8, 2 = 16
Read only in other modes
(Vit + R-S) Interleave depth
factor. Entry is not shown when
TPC enabled.
Data Dif Decoder
Enabled
Not
Shown
0 = Disable, 1 = Enable
(Vit + R-S) Differential Encoder
Not shown or settable except in
special modes.