3com 520 User Manual
Interface Cable Characteristics
B-9
Modem Cable
If you want to connect to the manager port using a
modem, you will need a cable as shown in the table
below. This connects the manager port’s 9 pin
D-type connector to a 25-pin serial port on a
modem.
LAN Port Connecting Cable - 10BaseT
The 10BaseT port terminates with an RJ45 connector
which can be connected to the 10BaseT port on
another device. The table below shows the pin-outs
for a straight through cable.
3Com end
pin no.
(9-way male
connector)
Signal Name
Pin
Links
Signal Name
Terminal
or Com
port end
pin number
(25-way
male/female
connector)
Shell
Screen
Screen
1
3
TxD
TxD
2
2
RxD
RxD
3
7
RTS
RTS
4
8
CTS
CTS
5
6
DSR
DSR
6
5
Ground
Ground
7
1
DCD
DCD
8
4
DTR
DTR
20
Pin
Links
3Com end
pin no.
(RJ45)
Signal name
Client end
pin no.
(RJ45)
1
TxD+
1
2
TxD-
2
3
RxD+
3
4
not used
4
5
not used
5
6
RxD-
6
7
not used
9
8
not used
10
Rc.bk : RCAPPB.FRM Page 9 Thursday, July 10, 1997 9:53 AM