Cisco console port for Cisco 1000, 1600, 2500, 2600, And 3600 series routers

pinout

The console and auxiliary ports on Cisco IOS routers are asynchronous serial ports. The console port is configured as data communications equipment (DCE)

8 pin RJ45 female connector  at the cisco router

Pin Name Description Dir 1 RTS Request To Send OUT 2 DTR Data Terminal Ready OUT 3 TXD Tranceive Data OUT 4 GND Ground - 5 GND Ground - 6 RXD Receive Data IN 7 DSR Data Set Ready IN 8 CTS Clear To Send IN

8 pin RJ45 male connector  at the cables

Source:www.pinouts.ru