Cisco Systems RJ-45-to-AUX Pin Signal Input/Output, DTE connectors for an RJ−45 to a DB−25 female

Pin	Signal	Input/Output
1	RTS	Out
2	DTR	Out
3	TXD	Out
4	GND	N/A
5	GND	N/A
6	RXD	In
7	DSR	In
8	CTS	In
Table 2.5: The RJ−45−to−DB−9 AUX port pinouts by color.
Color	RJ−45	DB−9
Brown	1	6
Blue	2	7
Yellow	3	2
Green	4	5
Red	5	5
Black	6	3
Orange	7	4
White	8	8

Table 2.6 shows the connectors most often used for modem connections. Table 2.7 shows the connectors most often used with Unix workstation connections to the console port.

Table 2.6: DCE connector pinouts for an RJ−45 to a DB−25 male.

RJ−45	DCE
1	5
2	8
3	3
4	7
5	7
6	2
7	20
8	4

Table 2.7: DTE connectors for an RJ−45 to a DB−25 female.

RJ−45	DTE
1	4
2	20
3	2
4	7
5	7
6	3
7	6
8	5

In the event that you need a DB−25−to−DB−9 connector, Table 2.8 shows the pinouts.

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