Comtech EF Data SNM-1010L - Manual (Page 44)

SNM-1010L Data/Control Modem Revision 0
Installation MN/SNM1010L.OM
2.3.4.3.1 V.35 Connector Pinouts
Table 2-8. 34-Pin Female Winchester Connector Pinouts (V.35)
Pin # Name
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)
a (AA) Serial Clock Transmit B (SCT B)
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)
Note: Pins H, J, K, L, M, N, Z, b (BB), e (EE), f (FF), h (HH), j (JJ), k (KK),
l (LL) have no connection.
The modem is available with a female Winchester V.35 as the data I/O connector. 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 EF Data has determined that several locations use Fireberd  test
equipment and a conflict will occur if CC is connected between the modem and
the Fireberd
.
2. Placing the jumper in positions 2 and 3 opens up the CC line, because the
TTC/Fireberd  test equipment interfaces use the line for DTE/DCE control.
3. Grounding pin CC at the Fireberd
 interface will change the Fireberd  to a
DCE device.
4. Comtech EF Data uses the CC and DD for the input master clock (same as the
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).
2–10