3Com Router 3000 Series - Page 22

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