A special type of cable, known as roll over cable is used to connect the Serial/COM port of the computer to the router or switch console port. One end of the cable is RJ49 type and a DB9 to RJ45 converter is molded on the other end. A picture of the console cable is shown below.
IF YOUR COMPUTER DOESNT HAVE A SERIAL PORT
If you have a new computer or laptop, there is a chance that you may not have a serial port in your computer. The new computers or laptops sold today do not include serial or printer ports. The serial ports have been replaced by Universal Serial Bus (USB) ports.
If you want to connect to the console port of your router or switch, you will need to use a USB to Serial Adapter. The USB to Serial adapter may not be plug-and-play. You need to install the corresponding drivers also for these adapters. A typical USB to Serial adapter with console cable is shown below.
TERMINAL EMULATOR SOFTWARE CONFIGURATION
PUTTY is a 3rd party terminal emulator software used to access the Switch or Router.
connect the console cable with Cisco Router or Swtich, double click putty.exe to execute it. Expand Connection > Serial. Enter the port number inside “Serial line to connect to” text box. to check this go to device manager in your computer
The port number is COM1 in below example. The port number may be different in your computer. Enter the correct port number when you connect from your computer. Enter other values also as shown below.
• Bits per sec: 9600
• Data bits: 8
• Parity: none
• Stop bits: 1
• Flow control: none
Click Session and click “Serial” radio button. Verify whether you can see the port number and the baud rate (9600) you had selected before. Click “Open” to connect to Cisco Router or Switch IOS.
3) PuTTY is connected to Cisco IOS and now you can configure, monitor or manage a Cisco Router or Switch using putty.