
18-4 Extreme Networks Consolidated Hardware Guide
Initial Switch and Management Access
Figure 18-1 shows the pinouts for a 9-pin to 25-pin (RS-232) null-modem cable.
Figure 18-1: Null-modem cable pinouts
Table 18-1: Pinouts for the Console Connector
Function Pin Number Direction
DCD (data carrier detect) 1 In
RXD (receive data) 2 In
TXD (transmit data) 3 Out
DTR (data terminal ready) 4 Out
GND (ground) 5 -
DSR (data set ready) 6 In
RTS (request to send) 7 Out
CTS (clear to send 8 In
Screen
TxD
RxD
Ground
RTS
CTS
DSR
DCD
DTR
Cable connector: 9-pin female
Switch
Cable connector: 25-pin male/female
25pin
PC/Terminal
Screen
RxD
TxD
Ground
RTS
DTR
CTS
DSR
DCD
Shell
3
2
5
7
8
6
1
4
1
3
2
7
4
20
5
6
8
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