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SLM-7650 Satellite Modem
Theory of Operation
4.4.3.2.1.4 Asynchronous Data Channel (50 pin)
An asynchronous data interface accessible through the 50 pin connector is provided. The
asynchronous data interface is selectable between the interface at the 50 pin connector or the
interface at the modem 9 pin ASYNC data connector.
4.4.3.2.1.5 Open Collector Fault Outputs (50 pin)
Open collector outputs for modulator fault (MF) and demodulator fault (DF) are provided
at the 50 pin connector. The open collector outputs source ground to indicate that the
associated fault does not exist. These fault indicators are used for interface to CEFD
redundancy systems.
4.4.3.2.1.6 AGC Output
A programmable DC output proportional to the receive signal level is provided on the 50
pin connector.
Characteristic
Output Voltage Range
Output Current
Min power (-60 dBm) output voltage
Max power (-15 dBm) output voltage
Receive Signal Level Output Indication
Definitions
0 to 10 Vdc
10 mA maximum
Programmable from 0 to 10 Vdc in .5 volt
increments. Default value of 0 Vdc
Programmable from 0 to 10 Vdc in .5 volt
increments Default value of 10 Vdc
The output voltage should be linear between the
maximum and minimum power settings with
respect to the receive signal level. The voltage
output limits at the programmed min/max voltages
for out of range receive signal levels.
4–20
Revision 4
MN/SLM7650.IOM
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