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COMSPHERE 3900 Series Modems
To connect a Model 3910 port to another modem's EIA-232-D interface, use a 25-pin crossover
cable (Figure C-4).
PLUG PIN NO.
TXD
RXD
RTS
DSR
SG
LSD
RXC
DTR
XTXC
C-6
25-POSITION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Figure C-4. Wiring Diagram — 25-Pin Crossover Cable
25-POSITION
PLUG PIN NO.
September 1998
1
2
TXD
3
RXD
4
RTS
5
6
DSR
7
SG
8
LSD
9
10
11
12
13
14
15
16
17
RXC
18
19
20
DTR
21
22
23
24
XTXC
25
3910-A2-GN32-40
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