Specifications

SDM-100A Satellite Modem Theory of Operation
Rev. 0 4–13
4.3.5 Modem Defaults
The M&C has default settings that are loaded into the modem at power-up. These default
settings are also loaded each time the modem has been Hard Reset.
The following table lists the defaults settings for each modem configuration parameter.
Defaults
Modulator Defaults Demodulator Defaults
Data Rate A Data Rate A
TX Rate A 64 kbit/s, QPSK RX Rate A 64 kbit/s, QPSK
TX Rate B 96 kbit/s, QPSK RX Rate B 96 kbit/s, QPSK
TX Rate C 128 kbit/s, QPSK RX Rate C 128 kbit/s, QPSK
TX Rate D 38.4 kbit/s, QPSK RX Rate D 38.4 kbit/s, QPSK
TX Rate V 19.2 kbit/s, QPSK RX Rate V 19.2 kbit/s, QPSK
TX-IF Frequency 70 MHz RX-IF Frequency 70 MHz
TX-IF Output OFF V.35 Descrambler ON
Mod Power Offset 0 dB Differential Decoder ON
TX Power Output -10 dBm Demodulator Type INTELSAT Open
V.35 Scrambler ON Decoder Type Viterbi
Differential Encoder ON IF Loopback OFF
Modulator Type INTELSAT Open RF Loopback OFF
Encoder Type Viterbi Sweep Center Freq 0 Hz
CW Mode Normal (OFF) Sweep Range 70000 Hz
BER Threshold None
Interface Defaults System Defaults
TX Clock Source TX Terrestrial Time 12:00 AM
Buffer Clock Source Receive Satellite Date 7/4/76
TX Clock Phase Auto Baud Rate 9600
RX Clock Phase Normal Parity Even
Baseband Loopback OFF Address 1
Buffer Size Bypass Operation Mode Duplex
Note: The following system settings will not revert to the default values after a hard
reset:
• Parity
• Remote Address
• Remote Baud Rate