3Com Router 3000 Series Manual page 22

3Com Router Release Notes for V1.20
V.24 (RS232) DTE Cable
The V.24 DTE cable has a DB25 (male) connector at the network end. Figure 7
illustrates the V.24 DTE cable.
Figure 7 V.24 DTE Cable
DB28 Male
Enlarged A side
Table 12 lists the V.24 DTE cable pinouts.
Table 12 V.24 DTE Cable Pinouts
DB28 Signal
6 GND
10 MODE_DCE
7 MODE0
21 GND
1 TXD+
9 RXD+
13 RTS+
23 CTS+
27 DTR+
25 DSR+
17 RXC+
3 TXC+
15 TXCE+
11 DCD+
22 LL
Shielding shell Core-shielding
layer
V.24 (RS232) DCE Cable
The V.24 DCE cable has a DB25 (female) connector at the network end. Figure 8
illustrates the V.24 DCE cable.
Figure 8 V.24 DCE Cable
DB28 Male
Enlarged A side
22
Label
Signal direction DB25 (male)
<--> 7
<--> 1
-> 2
<- 3
-> 4
<- 5
-> 20
<- 6
<- 17
<- 15
-> 24
<- 8
-> 18
<--> Shielding shell
Label
DB25 Male
Enlarged B s
Signal
Circuit GND
Shield GND
TXD
RXD
RTS
CTS
DTR
DSR
RXC
TXC
ETC
DCD
LTST
Core-shielding
layer
DB25 Female
Enlarged B