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Satellite Terminal System
Operation
The UART supports serial asynchronous communication (remote port) with a maximum
data rate of 19,200 bit/s. The communications type can be EIA-232, EIA-485 (2-wire), or
EIA-422 (4-wire) half duplex.
The DAC supplies a voltage that fine tunes the reference oscillator operating frequency.
The ADC monitors the internal power supply voltages, as well as external temperature
and analog inputs from SSPAs.
The three fault relay outputs are failsafe. They will indicate a fault in the event of a power
outage. The three relays are uplink fault, downlink fault, and summary fault.
The M&C has a switching regulator that can generate +15VDC at 400 mA to power an
external LNB. This voltage can be enabled or disabled via the remote interface. The
M&C monitors the LNB current and generates a fault if the LNB current draw increases
or decreases excessively.
The M&C communicates status and control information to the up converter, down con-
verter and SSPAs via a high speed RS-485 interface.
The 10 MHz OCVCXO is a high stability, low phase noise, crystal oscillator. It has a tun-
ing voltage input which can be used to fine tune the oscillator frequency. The M&C gen-
erates a bias voltage which can be changed remotely to set the oscillator frequency.
The 72 MHz VCXO is phase locked to the 10 MHz reference. The 72 MHz output of the
VCXO is amplified and distributed throughout the KST-2000L to provide a reference fre-
quency for the up converter and portions of the down converter.
4–5
Revision 2
MN/KST2000L.IOM
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