Comtech EF Data SDM-2020 - Manual (Page 140)

SDM-2020 Satellite Modulator Revision 7
Data Interfaces MN/SDM2020M.IOM
11-5
11.1.3 S
PECIFICATION
S
UMMARY
Table 11-2. Specification Summary
General: Per ITU-T G.703 where applicable unless otherwise specified
Data Rates
(programmable) 1.544, 2/048 6.312, 8.448, 32.064, 34.368, 44.736, or 51.840 Mbps
(per Bellcore SONET STS-1)
Internal Clock Accuracy 10 ppm
Line Coding AMI (none), HDB3, B8ZS, or B3ZS
Interface Loopback ON/OFF
Interface Loop-Through ON/OFF
Jitter Characteristics Per ITU-T G.823 and ITU-T G.824 where applicable
TX 2047 Pattern
Generator ON/OFF (programmable test mode)
TX Data Interface:
Input Signal
Characteristics Per ITU-T G.703
Input Impedance 75 Ω
Connector Type BNC (female)
Auxiliary Functions Port:
Signals MF (modulator fault, open collector TTL output)
RS (modulator output control, TTL input)
Connector Type 9 pin sub-D (female)
Controlled Functions: TX Data Rate
TX Terrestrial Line Coding
Interface Loop-Through
Interface Loopback
Buffer Size
Buffer Clock Source
Buffer Frame Structure
Buffer Center
External Reference Frequency
TX Data Fault
TX 2047 Pattern
Monitor Functions:
TX Interface Faults Clock activity, data/AIS, TX PLL, FPGA program