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Introduction
Two mechanisms are provided for uplink power control within a closed network.
•
•
Note: The self-monitoring AUPC function is not available. ASYNC/AUPC interface is
selected as the modem type.
The modem interfaces between the channel unit or multiplexer (MUX) and Intermediate
Frequency (IF) converter equipment operating in a 50 to 180 MHz band. An internal
channel unit, conforming to IESS-308, -309, and -310 emulation specifications, provides
overhead designated for an ESC.
The modem interfaces between Single Channel Per Carrier (SCPC) fixed-rate terminal
equipment operating within the following specifications:
•
•
Note: The modem can be configured to add overhead/framing to the data.
Available modulation types include:
•
•
•
•
1–4
One method, which requires the optional ASYNC/AUPC interface card, is used
for control between two links to sustain sufficient transmit power to maintain a
programmed E
/N
at both ends.
b
0
The second method is used for self-monitoring the carrier from the same uplink
with the local demodulator, requires no additional hardware, and is software-
selectable. This method is appropriate for applications such as paging networks,
where the uplink is transmitting to receive-only devices.
Data rate of 4 Mbits/s with 7/8 Forward Error Correction (FEC)
Symbol rate of 4.8 ks/s to 2500 Ms/s
Bi-Phase Shift Keying (BPSK)
Quadrature Phase Shift Keying (QPSK)
Offset Quadrature Phase Shift Keying (OQPSK)
8PSK
SDM-300A Satellite Modem
Rev. 4
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