3Com Router 3012 Installation Manual page 61

EIA/TIA-449 DCE Cable
Pinouts
Table 37 EIA/TIA-449 DTE Cable Pinouts (continued)
DB50 Signal
40 TXCE/RXC-
19 RXC/TXCE+
43 RXC/TXCE-
18 TXC/NIL+
42 TXC/NIL-
- Shielding sheath
Figure 37 illustrates the EIA/TIA-449 DCE cable.
Figure 37 EIA/TIA-449 DCE Cable Assembly
Table 38 describes EIA/TIA-449 DCE cable pinouts.
EIA/TIA-449 DCE Cable Pinouts
Table 38
DB50 Signal
7 GND
50 GND
8 DTR/DSR+
32 DTR/DSR-
13 DSR/DTR+
37 DSR/DTR-
10 RTS/CTS+
34 RTS/CTS-
38 CTS/RTS+
14 CTS/RTS-
36 DCD/DCD+
12 DCD/DCD-
20 RXD/TXD+
44 RXD/TXD-
15 TXD/RXD+
39 TXD/RXD-
16 TXCE/RXC+
40 TXCE/RXC-
19 RXC/TXCE+
43 RXC/TXCE-
17 NIL/TXC+
Signal Direction Signal
-> TT-
<- RT+
<- RT-
<- ST+
<- ST-
<--> Shielding sheath
Signal Direction Signal
<--> Circuit GND
<--> Shield GND
-> DM+
-> DM-
<- TR+
<- TR-
-> CS+
-> CS-
<- RS+
<- RS-
<- RR+
<- RR-
<- SD+
<- SD-
-> RD+
-> RD-
<- RT+
<- RT-
<- TT+
<- TT-
<- ST+
Serial Port Cable 61
DB37
35
8
26
5
23
-
DB37
19
1
11
29
12
30
9
27
7
25
13
31
4
22
6
24
8
26
17
35
5