Serial interfaces cables and converters scheme  > Cisco pinouts
Adapter DTE M/F Pins1 DCE M/F Pins MMOD Pins2
RJ-45 Pins DB-25 Pins
1 4 5 5
2 20 6 8
3 2 3 3
4 7 7 7
5 7 7 7
6 3 2 2
7 6 20 20
8 5 4 4

1 The FDTE RJ-45-to-DB-25 adapter is labeled "Terminal."
2 The MMOD RJ-45-to-DB-25 adapter is labeled "Modem."

25 pin D-SUB female connector layout
25 pin D-SUB female connector
at the computer
8 pin RJ45 (8P8C) male connector layout
8 pin RJ45 (8P8C) male connector
at the Cisco router
According to 5 reports in our database (5 positive and 0 negative) this pinout should be correct.

Is this pinout
Cisco RJ45 to DB25 adapter visual pinout:
Cisco RJ45 to DB25 adapter diagram
click to enlarge
Source(s) of this and additional information: Cisco Systems, Inc.
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