Hello Mohammad
In order to save space Rene didn’t explain extensively how to configure reverse telnet, but just showed how to configure a banner for it. A nice piece of information about reverse telnet can be found at this Cisco support forum article, but I can tell you a little about it here.
It basically gives you the ability to telnet into a network connected device (say a router) and then connect to a neighbouring device via its console connection. In essence, this gives you the opportunity to remotely connect to the console connection of a device. This can be useful when IP connectivity has been lost to a device and you are far away from the device itself (in a different city or country for example).
The IP address 1.1.1.1 is a loopback interface that has to be configured on the device and the port used is 6000 + TTY number of the AUX: 6000+97 = 6097. The 6000 may be 2000 or another number depending on the platform you use. You can find out more about it in the link above.
I hope this has been helpful!
Laz