3Com Router 3012 Installation Manual page 60

60 C A: O
HAPTER PTIONAL
EIA/TIA-449 DTE Cable
Pinouts
C S
ABLE PECIFICATIONS
Table 36 X.21 DCE Cable Pinouts (continued)
DB50 Signal
14 CTS/RTS-
20 RXD/TXD+
44 RXD/TXD-
15 TXD/RXD+
39 TXD/RXD-
16 RXC/TXCE+
40 RXC/TXCE-
- Shielding sheath
Figure 36 illustrates the EIA/TIA-449 DTE cable.
Figure 36 EIA/TIA-449 DTE Cable Assembly
Table 37 describes EIA/TIA-449 DTE cable pinouts.
Table 37 EIA/TIA-449 DTE Cable Pinouts
DB50 Signal
7 GND
23 DTE/DCE
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-
1 LL/LL
20 RXD/TXD+
44 RXD/TXD-
15 TXD/RXD+
39 TXD/RXD-
16 TXCE/RXC+
Signal Direction Signal
<- Control-
<- Transmit+
<- Transmit-
-> Receiver+
-> Receiver-
-> Timing+
-> Timing-
<--> Shielding sheath
Signal Direction Signal
<--> Circuit GND
- Circuit GND
<--> Sield GND
-> TR+
-> TR-
<- DM+
<- DM-
-> RS+
-> RS-
<- CS+
<- CS-
<- RR+
<- RR-
-> LL
<- RD+
<- RD-
-> SD+
-> SD-
-> TT+
DB15
10
2
9
4
11
6
13
-
DB37
19
19
1
12
30
11
29
7
25
9
27
13
31
10
6
24
4
22
17