AMT-70/AMT-73/AMT-75 Installation and Operation
An example of the latter’s use would be for a simple BOD system, where there have been up to 10
satellite channels set aside for communication with as many as perhaps 100 remote terminals. Each
remote modem would have previously been preset to those channels, and merely recalling and
activating the memory location of an inactive satellite channel places that site (or modem) online.
3.4.1 The default configuration
The default configuration file is static file template defined to configure the modem in a well-known
operational state. If two modems are configured back-to-back in default mode they should
communicate with each other after the default command is run.
1. The CLI “default” command can be used
2. On the front-panel the FUNC/CONFIG/DEFAULT load this configuration
FUNC:
DEFAULT LOAD.CFG SAVE.CFG
You must note that the default file is static and cannot be changed by the modem operator. The
DEFAULT parameters are as follows:
Figure 6: AMT70 Modem Default Parameters
Modulator Parameters Demodulator Parameters Interface Parameters
Data Rate Units BPS Data Rate Units BPS Interface Type rs530
Data Rate 5,000,000 Data Rate 5,000,000 Transmit Clock internal
Modulation QPSK Demodulation QPSK Receive Clock local
Code Type INTELSAT Code Type INTELSAT Loopback Mode off
Code Rate 1/2 Code Rate 1/2 Tx Clock Inversion off
RS Rate off RS Rate off Rx Clock Inversion off
Diff Encoder ON Diff Decoder ON Doppler Buffer Mode auto
Scrambler ON Descrambler ON Tx Data Inversion off
Carrier Freq 1,000,000,000 Carrier Freq 1,000,000,000 Rx Data Inversion off
Spectrum Invert NORMAL Spectrum Invert auto
Filter Alpha 0.35 Filter Alpha 0.35
Transmit Level -25 FFT Spectrum Anal AUTO
Tx Signal on Sweep Range 250,000
IF Loopback OFF Sweep Step Size 50,000
Tx Output Band Lband Rx Input input1
Tx Data Input INTERNAL_PRBS LNB Power OFF
BER Test Pattern 2_23 LNB Tone Status OFF
RS Interleaver depth4 LNB 10 MHz Ref OFF
CW Carrier off Raw Data via MPEG off
Tx Reset RS Interleaver depth4
Rx Offset 0
Rx Clock Option ext
D/C Mute Mode
3 off
Rx Reset
49
3
Available only on AMT-73 modem
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General