Specification - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem

3.2.1.3 Specification

Circuit Supported
Amplitude (RD, RT, ST, DM, RR)
DC Offset (RD, RT, ST, DM, RR)
Impedance (RD, RT, ST, DM, RR)
Impedance (SD, TT, MC)
Polarity
Phasing (RD, RT)
Symmetry (ST, TT, RT)
Frequency Stability (ST)
Modulator Fault
Demodulator Fault
Rev. 5
SD, ST, TT, RD, RT, DM, RR, MOD, FAULT,
DEMOD FAULT, MC.
4, ± 2V differential into 100
0, ± 0.4V.
Less than 100 Ω , differential.
100, ± 20 Ω , differential.
True when B positive wrt A.
False when A positive wrt B.
False to True transition of RT nominally in
center of RD data bit.
50%, ± 5%.
± 100 PPM.
Open collector output.
15V max.
20 mA max. current sink.
Fault is open circuit.
Open collector output.
15V max.
20 mA max. current sink.
Fault is open circuit.
Configuration
Ω .
3–13