Comtech EF Data SDM-2020 - Manual (Page 171)

SDM-2020 Satellite Demodulator Revision 4
G.703 Data Interface MN/SDM2020D.IOM
11–5
11.1.3 Specifications
Table 11-1 is a summary of the G.703 data interface specifications, demodulator
application.
Table 11-1. G.703 Specification
G.703 Specifications
General
Per ITU-T G.703 where applicable unless otherwise specified
Data Rates (programmable) 1.544 Mbps
2.048 Mbps
6.312 Mbps
8.448 Mbps
32.064 Mbps
34.368 Mbps
44.736 Mbps (per ITU-T G.703)
51.840 Mbps (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 Mbps - none, G.704
2.048 Mbps - none, G.704
6.312 Mbps - none, G.704, G.743, or G.747
8.448 Mbps - none, G.704, G.742, or G.745
32.064 Mbps – none, G.752
34.368 Mbps - none, G.751, or G.753
44.736 Mbps – none, G.752
51.840 Mbps – none, STS-1
Buffer Output Clock Source
(programmable) Internal, TX terrestrial (recovered), external reference, or satellite
(bypass)