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Installation
The modem is available with a Winchester V.35 as the data I/O connector (PL/6032).
There is a jumper on the unit that either opens or closes the CC line. The interface is
shipped with jumpers in positions 2 and 3, because:
1. Comtech EFData has determined that several locations use Fireberd test
2. Placing the jumper in positions 2 and 3 opens up the CC line, because the
3. Grounding pin CC at the Fireberd interface will change the Fireberd to a
4. Comtech EFData uses the CC and DD for the input master clock (same as the
2–10
Table 2-5. 34-Pin Winchester Connector Pinouts (V.35)
Pin #
A
Ground
B
Ground
C
Request to Send (RTS)
D
Clear to Send (CTS)
E
Data Set Ready (DSR)
F
Receive Line Signal Detect (RLSD)
P
Send Data A (SD-A)
R
Receive Data A (RD-A)
S
Send Data B (SD+B)
T
Receive Data B (RD+B)
U
Serial Clock Transmit External A (SCTE-A)
V
Serial Clock Receive A (SCR-A)
W
Serial Clock Transmit External B (SCTE+B)
X
Serial Clock Receive B (SCR+B)
Y
Serial Clock Transmit A (SCT-A)
c (CC)
External Reference Clock A (EXC-A)
d (DD)
External Reference Clock B (EXC-B)
m (MM)
Modulator Fault (MF)
n (NN)
Demodulator Fault (DF)
a(AA)
Serial Clock Transmit B (SCT+B)
Note: Pins H, J, K, L, M, N, Z, a (AA), b (BB), e (EE), f (FF), h (HH), j (JJ),
k (KK), l (LL) have no connection.
equipment and a conflict will occur if CC is connected between the modem and
the Fireberd.
TTC/Fireberd test equipment interfaces use the line for DTE/DCE control.
DCE device.
external clock input to the modem). To input an external clock, change the jumper
to positions 1 and 2 (the pin closest to the Winchester connector).
SDM-300A Satellite Modem
Name
Rev. 4
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