Comtech EF Data SDM-2020, Installation And Operation Manual

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Data Interfaces SDM-2020 Satellite Demodulator
A–44 Rev.3
A.6.3 Specifications
Table A-23 is a summary of the G.703 data interface specifications, demodulator
application.
Table A-23. G.703 Specification
G.703 Specifications
General Per ITU-T G.703 where applicable unless otherwise specified
Data Rates (programmable)
•
1.544 Mbit/s
•
2.048 Mbit/s
•
6.312 Mbit/s
•
8.448 Mbit/s
•
32.064 Mbit/s
•
34.368 Mbit/s
•
44.736 Mbit/s (per ITU-T G.703)
•
51.840 Mbit/s (per Bellcore SONET STS-1)
Internal Clock Accuracy 10ppm
Line Coding AMI (none), HDB3, B8ZS, or B3ZS
Interface Loopback ON or OFF
Interface Loop-Through ON or OFF
Jitter Characteristics Per ITU-T G.823 and ITU-T G.824 where applicable
RX 2047 Pattern Correlation ON/OFF (programmable test mode with error rate reporting)
TX Data Interface
Input Signal Characteristics Per ITU-T G.703
Input Impedance
75
Ω
Connector Type BNC (female)
RX Data Interface
Output Signal Characteristics Per ITU-T G.703
Output Impedance
75
Ω
Connector Type BNC (female)
Receive Buffer Plesiochronous/Doppler
Buffer Size 2 milliseconds to 32 milliseconds, programmable in steps of 2 ms
Frame Structures (Programmable for plesiochronous buffer slips)
1.544 Mbit/s - none, G.704
2.048 Mbit/s - none, G.704
6.312 Mbit/s - none, G.704, G.743, or G.747
8.448 Mbit/s - none, G.704, G.742, or G.745
32.064 Mbit/s – none, G.752
34.368 Mbit/s - none, G.751, or G.753
44.736 Mbit/s – none, G.752
51.840 Mbit/s – none, STS-1
Buffer Output Clock Source
(programmable) Internal, TX terrestrial (recovered), external reference, or satellite (bypass)