Specifications

SDM-650B Satellite Modem Configuration
Rev. 5 3–23
3.2.3.2 Connector Pinouts
The DS-1 interface is provided on a 15-pin female D connector accessible from the
modem rear panel. Screw locks are provided for mechanical security of the mating
connector.
Signal Function Name Pin #
SEND DATA SD-A
SD-B
1
9
RECEIVE DATA RD-A
RD-B
3
11
MASTER CLOCK MC-A
MC-B
7
8
MODULATOR FAULT ---- 14
DEMODULATOR FAULT ---- 15
GROUND GND 2, 4
3.2.3.3 Specification
Circuits Supported SD, RD, MOD FAULT, DEMOD FAULT
Data Rate 1.544 Mbit/s ± 100 bit/s
Pulse Width (RD) 324, ± 50 ns
Line Code AMI or B8ZS (selectable)
RD Amplitude
2.75,
± 0.25V pk into a 100Ω termination
SD Amplitude 3, ± 1.5V pk into a 100Ω termination
Jitter Attenuation (SD) Meets AT&T Publication 62411 specification
Modulator Fault Open collector output
15V max
20 mA current sink
Fault is open circuit
Demodulator Fault Open collector output
15V max
20 mA current sink
Fault is open circuit