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SDM-309B Satellite Modem
2.2.2 Connector Pinouts
The V.35 interface is provided on the industry standard 34 pin block connector
accessible from the rear panel of the modem. Screw locks are provided for mechanical
security of the mating connector.
SIGNAL GROUND
SEND DATA
SERIAL CLOCK TRANSMIT
RECEIVE DATA
REQUEST TO SEND
SERIAL CLOCK RECEIVE
CLEAR TO SEND
DATA SET READY
RECEIVE LINE SIGNAL DETECT
SERIAL CLOCK TRANSMIT EXT.
MODULATOR FAULT
DEMODULATOR FAULT
MASTER CLOCK
(INPUT)
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
MN/U-SDM309B Rev. #
Signal Function
Name
Pin Number
SG
A,B
SD-A
P
SD-B
S
SCT-A
Y
SCT-B
(AA)
RD-A
R
RD-B
T
RTS
C
SCR-A
V
SCR-B
X
CTS
D
DSR
E
RLSD
F
SCTE-A
U
SCTE-B
W
---
(MM) m
---
(NN) n
MC-A
(CC) c
MC-B
(DD) d
SD, SCT, SCTE, RD, SCR, DSR, RLSD,
MOD, FAULT, DEMOD FAULT, MC
.55 V pk ± 20% differential, into 100 !
10 ± 5 V into 5000 ± 2000 !
100 ± 20 !, differential
100 ± 10 !, differential
5000 ± 2000 !, <2500 pf
± .6 V max, 1000 ohm 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
15 V max
20 mA current sink max
Fault is open circuit
Open collector output
15 V max
20 mA current sink max
Fault is open circuit
External Channel Unit
C-C–21
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