(Note: this matches the pinout of Amazon: Cisco: HDE 6ft DB9 9-Pin Serial Port to RJ45 Cat5 Ethernet LAN Console Cable)
Female Serial:
________
\54321 /
\9876/
----
Male ethernet plug:
Top:
12345678
Mapping from a working cable:
Eth - Serial
1 8
2 6
3 2
4 5
5 -
6 3
7 4
8 7
Helpful guide: How to creat Cisco console cable by yourself
Random Female DB9 color code:
1 Black
2 Brown
3 Red
4 Orange
5 Yellow
6 Green
7 Blue
8 Gray
9 White