[Mike Lu] likes to add serial ports to his routers to use ... about repurposing the four unused wires on one of the RJ45 Ethernet connectors. This would allow him to interface with the necessary ...

Console cable :6FT-USB-RS232-RJ45 console cable .It's used for debugging and configuring network equipment !!Please NOTE this is USB to RJ45 CONSOLE CABLE ,Not ETHERNET !!!It is 8p8c!