Table of Contents
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Introduction
1.1
Overview
The SDM-300A Satellite Modem is a high performance, full-duplex, digital-vector,
modulator/demodulator that meets the open network requirements of the INTELSAT
Earth Station Standards (IESS) -308, -309, and –310 emulation specifications for the
following:
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Additionally, the modem is used for any closed network satellite communication system.
The modem modulator provides the following functions:
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The modem demodulator provides the following functions:
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1–2
Intermediate Data Rate (IDR)
INTELSAT Business Services (IBS)
Satellite Multiservice System (SMS)
Performs filtered BPSK, QPSK, OQPSK, and 8PSK modulation onto a variable
frequency/amplitude carrier.
Encode the data for the appropriate decoder.
Scrambler the data.
Monitor and display the modulator status without interrupting service.
Provide send clock timing
Perform self-test.
Performs filtered BPSK, QPSK, OQPSK, and 8PSK demodulation from carriers
of variable frequencies/amplitudes.
Decode the data.
Descrambler the data.
Monitor and display the demodulator status without interrupting service
Perform self-test.
SDM-300A Satellite Modem
Rev. 4
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