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

SDM-650B Satellite Modem

3.2.2.3 Specification

Circuit Supported
Amplitude (RD, SCR, SCT, SD, SCTE)
Amplitude (CTS, DSR, RLSD)
Impedance (RD, SCR, SCT)
Impedance (SD, SCTE)
Impedance (RTS)
DC Offset (RD, SCR, SCT)
Polarity (SD, SCT, SCTE, RD, SCR)
Polarity (RTS, CTS, DSR, RLSD)
Phasing (SCTE, SCR)
Symmetry (SCT, SCTE, SCR)
Frequency Stability (SCT)
Modulator Fault
Demodulator Fault
Rev. 5
SD, SCT, SCTE, RD, SCR, DSR, RLSD, MOD,
FAULT, DEMOD FAULT, MC.
0.55V pk, ± 20% differential, into 100
5V into 5000, ± 2000
10, ±
100, ± 20 Ω , differential.
100, 10 , differential.
± Ω
5000, 2000 , < 2500 pF.
± Ω
± 0.6V max., 1000Ω termination to ground.
True when B positive wrt A.
False when A positive wrt B.
True when < -3V wrt ground.
False when > +3V wrt ground.
False to True transition nominally in center of data
bit.
50%, ± 5%.
± 100 PPM.
Open collector output.
15V max.
20 mA current sink max.
Fault is open circuit.
Open collector output.
15V max.
20 mA current sink max.
Fault is open circuit.
Configuration
Ω .
Ω .
3–19