SDM-2020 Satellite Demodulator
Data Interfaces
Rev.3
A–45
Table A-23. G.703 Specification (Continued)
G.703 Specifications (Continued)
External Reference Clock
Input Signal Characteristics
Sine wave or square wave with duty cycle of 50% (
±
10%)
Input Amplitude
0.5 to 5.0V peak to peak
Input Impedance
75
Ω
±
5%
Input Frequency
1.544 to 20.0 MHz in steps of 8.0 kHz or at RX data rate
Connector Type
BNC (female)
Auxiliary Functions Port
Signals
DF (demodulator fault, open collector TTL output)
CD (carrier detect, TTL output)
Connector Type
9-pin sub-D (female)
Controlled Items:
Data
Date Rate
Line Coding
Test Modes
Interface Loop-Through
Interface Loopback
RX2047 Pattern
Buffer/Doppler/Plesiochronous
Size
Clock Source
Frame Structure
Buffer Centering
Monitor Functions
RX Interface Faults
Buffer underflow, buffer overflow, buffer clock activity, buffer clock
PLL, buffer full, data/AIS, 2047 pattern lock, FPGA program
Buffer Fill Status
1 to 99%
RX 2047 Error Rate
1E-3 to 5 E-8 (with one magnitude accuracy)
Summary of Contents for SDM-2020
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